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<button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2410.08772">arXiv:2410.08772</a> <span> [<a href="https://arxiv.org/pdf/2410.08772">pdf</a>, <a href="https://arxiv.org/format/2410.08772">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Data Analysis, Statistics and Probability">physics.data-an</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> High Level Reconstruction with Deep Learning using ILD Full Simulation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Suehara%2C+T">Taikan Suehara</a>, <a href="/search/physics?searchtype=author&query=Tagami%2C+R">Risako Tagami</a>, <a href="/search/physics?searchtype=author&query=Gui%2C+L">Lai Gui</a>, <a href="/search/physics?searchtype=author&query=Murata%2C+T">Tatsuki Murata</a>, <a href="/search/physics?searchtype=author&query=Tanabe%2C+T">Tomohiko Tanabe</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">Wataru Ootani</a>, <a href="/search/physics?searchtype=author&query=Ishino%2C+M">Masaya Ishino</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2410.08772v1-abstract-short" style="display: inline;"> Deep learning can give a significant impact on physics performance of electron-positron Higgs factories such as ILC and FCCee. We are working on two topics on event reconstruction to apply deep learning. The first is jet flavor tagging, in which we apply particle transformer to ILD full simulation to obtain jet flavor, including strange tagging. The second is particle flow, which clusters calorime… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.08772v1-abstract-full').style.display = 'inline'; document.getElementById('2410.08772v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.08772v1-abstract-full" style="display: none;"> Deep learning can give a significant impact on physics performance of electron-positron Higgs factories such as ILC and FCCee. We are working on two topics on event reconstruction to apply deep learning. The first is jet flavor tagging, in which we apply particle transformer to ILD full simulation to obtain jet flavor, including strange tagging. The second is particle flow, which clusters calorimeter hits and assigns tracks to them to improve jet energy resolution. We modified the algorithm developed in context of CMS HGCAL based on GravNet and Object Condensation techniques and add a track-cluster assignment function into the network. The overview and performance of these algorithms are described. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.08772v1-abstract-full').style.display = 'none'; document.getElementById('2410.08772v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 3 figures, Submitted to Proc. 42nd International Conference on High Energy Physics (ICHEP2024), July 2024, Prague</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.19417">arXiv:2407.19417</a> <span> [<a href="https://arxiv.org/pdf/2407.19417">pdf</a>, <a href="https://arxiv.org/format/2407.19417">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Photon energy reconstruction with the MEG II liquid xenon calorimeter </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Yamamoto%2C+K">Kensuke Yamamoto</a>, <a href="/search/physics?searchtype=author&query=Ban%2C+S">Sei Ban</a>, <a href="/search/physics?searchtype=author&query=Gerritzen%2C+L">Lukas Gerritzen</a>, <a href="/search/physics?searchtype=author&query=Iwamoto%2C+T">Toshiyuki Iwamoto</a>, <a href="/search/physics?searchtype=author&query=Kobayashi%2C+S">Satoru Kobayashi</a>, <a href="/search/physics?searchtype=author&query=Matsushita%2C+A">Ayaka Matsushita</a>, <a href="/search/physics?searchtype=author&query=Mori%2C+T">Toshinori Mori</a>, <a href="/search/physics?searchtype=author&query=Onda%2C+R">Rina Onda</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">Wataru Ootani</a>, <a href="/search/physics?searchtype=author&query=Oya%2C+A">Atsushi Oya</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2407.19417v1-abstract-short" style="display: inline;"> The MEG II experiment searches for a charged-lepton-flavour-violating $渭\to e 纬$ with the target sensitivity of $6 \times 10^{-14}$. A liquid xenon calorimeter with VUV-sensitive photosensors measures photon position, timing, and energy. This paper concentrates on the precise photon energy reconstruction with the MEG II liquid xenon calorimeter. Since a muon beam rate is… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.19417v1-abstract-full').style.display = 'inline'; document.getElementById('2407.19417v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.19417v1-abstract-full" style="display: none;"> The MEG II experiment searches for a charged-lepton-flavour-violating $渭\to e 纬$ with the target sensitivity of $6 \times 10^{-14}$. A liquid xenon calorimeter with VUV-sensitive photosensors measures photon position, timing, and energy. This paper concentrates on the precise photon energy reconstruction with the MEG II liquid xenon calorimeter. Since a muon beam rate is $3\text{-}5 \times 10^{7}~\text{s}^{-1}$, multi-photon elimination analysis is performed using waveform analysis techniques such as a template waveform fit. As a result, background events in the energy range of 48-58 MeV were reduced by 34 %. The calibration of an energy scale of the calorimeter with several calibration sources is also discussed to achieve a high resolution of 1.8 %. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.19417v1-abstract-full').style.display = 'none'; document.getElementById('2407.19417v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 7 figures. Contribution to 20th International Conference on Calorimetry for Particle Physics (CALOR2024). Submitted to EPJ Web of Conferences</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.00178">arXiv:2407.00178</a> <span> [<a href="https://arxiv.org/pdf/2407.00178">pdf</a>, <a href="https://arxiv.org/format/2407.00178">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Shower Separation in Five Dimensions for Highly Granular Calorimeters using Machine Learning </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Lai%2C+S">S. Lai</a>, <a href="/search/physics?searchtype=author&query=Utehs%2C+J">J. Utehs</a>, <a href="/search/physics?searchtype=author&query=Wilhahn%2C+A">A. Wilhahn</a>, <a href="/search/physics?searchtype=author&query=Fouz%2C+M+C">M. C. Fouz</a>, <a href="/search/physics?searchtype=author&query=Bach%2C+O">O. Bach</a>, <a href="/search/physics?searchtype=author&query=Brianne%2C+E">E. Brianne</a>, <a href="/search/physics?searchtype=author&query=Ebrahimi%2C+A">A. Ebrahimi</a>, <a href="/search/physics?searchtype=author&query=Gadow%2C+K">K. Gadow</a>, <a href="/search/physics?searchtype=author&query=G%C3%B6ttlicher%2C+P">P. G枚ttlicher</a>, <a href="/search/physics?searchtype=author&query=Hartbrich%2C+O">O. Hartbrich</a>, <a href="/search/physics?searchtype=author&query=Heuchel%2C+D">D. Heuchel</a>, <a href="/search/physics?searchtype=author&query=Irles%2C+A">A. Irles</a>, <a href="/search/physics?searchtype=author&query=Kr%C3%BCger%2C+K">K. Kr眉ger</a>, <a href="/search/physics?searchtype=author&query=Kvasnicka%2C+J">J. Kvasnicka</a>, <a href="/search/physics?searchtype=author&query=Lu%2C+S">S. Lu</a>, <a href="/search/physics?searchtype=author&query=Neub%C3%BCser%2C+C">C. Neub眉ser</a>, <a href="/search/physics?searchtype=author&query=Provenza%2C+A">A. Provenza</a>, <a href="/search/physics?searchtype=author&query=Reinecke%2C+M">M. Reinecke</a>, <a href="/search/physics?searchtype=author&query=Sefkow%2C+F">F. Sefkow</a>, <a href="/search/physics?searchtype=author&query=Schuwalow%2C+S">S. Schuwalow</a>, <a href="/search/physics?searchtype=author&query=De+Silva%2C+M">M. De Silva</a>, <a href="/search/physics?searchtype=author&query=Sudo%2C+Y">Y. Sudo</a>, <a href="/search/physics?searchtype=author&query=Tran%2C+H+L">H. L. Tran</a>, <a href="/search/physics?searchtype=author&query=Liu%2C+L">L. Liu</a>, <a href="/search/physics?searchtype=author&query=Masuda%2C+R">R. Masuda</a> , et al. (26 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2407.00178v1-abstract-short" style="display: inline;"> To achieve state-of-the-art jet energy resolution for Particle Flow, sophisticated energy clustering algorithms must be developed that can fully exploit available information to separate energy deposits from charged and neutral particles. Three published neural network-based shower separation models were applied to simulation and experimental data to measure the performance of the highly granular… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.00178v1-abstract-full').style.display = 'inline'; document.getElementById('2407.00178v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.00178v1-abstract-full" style="display: none;"> To achieve state-of-the-art jet energy resolution for Particle Flow, sophisticated energy clustering algorithms must be developed that can fully exploit available information to separate energy deposits from charged and neutral particles. Three published neural network-based shower separation models were applied to simulation and experimental data to measure the performance of the highly granular CALICE Analogue Hadronic Calorimeter (AHCAL) technological prototype in distinguishing the energy deposited by a single charged and single neutral hadron for Particle Flow. The performance of models trained using only standard spatial and energy and charged track position information from an event was compared to models trained using timing information available from AHCAL, which is expected to improve sensitivity to shower development and, therefore, aid in clustering. Both simulation and experimental data were used to train and test the models and their performances were compared. The best-performing neural network achieved significantly superior event reconstruction when timing information was utilised in training for the case where the charged hadron had more energy than the neutral one, motivating temporally sensitive calorimeters. All models under test were observed to tend to allocate energy deposited by the more energetic of the two showers to the less energetic one. Similar shower reconstruction performance was observed for a model trained on simulation and applied to data and a model trained and applied to data. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.00178v1-abstract-full').style.display = 'none'; document.getElementById('2407.00178v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.04632">arXiv:2403.04632</a> <span> [<a href="https://arxiv.org/pdf/2403.04632">pdf</a>, <a href="https://arxiv.org/format/2403.04632">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Software Compensation for Highly Granular Calorimeters using Machine Learning </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Lai%2C+S">S. Lai</a>, <a href="/search/physics?searchtype=author&query=Utehs%2C+J">J. Utehs</a>, <a href="/search/physics?searchtype=author&query=Wilhahn%2C+A">A. Wilhahn</a>, <a href="/search/physics?searchtype=author&query=Bach%2C+O">O. Bach</a>, <a href="/search/physics?searchtype=author&query=Brianne%2C+E">E. Brianne</a>, <a href="/search/physics?searchtype=author&query=Ebrahimi%2C+A">A. Ebrahimi</a>, <a href="/search/physics?searchtype=author&query=Gadow%2C+K">K. Gadow</a>, <a href="/search/physics?searchtype=author&query=G%C3%B6ttlicher%2C+P">P. G枚ttlicher</a>, <a href="/search/physics?searchtype=author&query=Hartbrich%2C+O">O. Hartbrich</a>, <a href="/search/physics?searchtype=author&query=Heuchel%2C+D">D. Heuchel</a>, <a href="/search/physics?searchtype=author&query=Irles%2C+A">A. Irles</a>, <a href="/search/physics?searchtype=author&query=Kr%C3%BCger%2C+K">K. Kr眉ger</a>, <a href="/search/physics?searchtype=author&query=Kvasnicka%2C+J">J. Kvasnicka</a>, <a href="/search/physics?searchtype=author&query=Lu%2C+S">S. Lu</a>, <a href="/search/physics?searchtype=author&query=Neub%C3%BCser%2C+C">C. Neub眉ser</a>, <a href="/search/physics?searchtype=author&query=Provenza%2C+A">A. Provenza</a>, <a href="/search/physics?searchtype=author&query=Reinecke%2C+M">M. Reinecke</a>, <a href="/search/physics?searchtype=author&query=Sefkow%2C+F">F. Sefkow</a>, <a href="/search/physics?searchtype=author&query=Schuwalow%2C+S">S. Schuwalow</a>, <a href="/search/physics?searchtype=author&query=De+Silva%2C+M">M. De Silva</a>, <a href="/search/physics?searchtype=author&query=Sudo%2C+Y">Y. Sudo</a>, <a href="/search/physics?searchtype=author&query=Tran%2C+H+L">H. L. Tran</a>, <a href="/search/physics?searchtype=author&query=Buhmann%2C+E">E. Buhmann</a>, <a href="/search/physics?searchtype=author&query=Garutti%2C+E">E. Garutti</a>, <a href="/search/physics?searchtype=author&query=Huck%2C+S">S. Huck</a> , et al. (39 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2403.04632v1-abstract-short" style="display: inline;"> A neural network for software compensation was developed for the highly granular CALICE Analogue Hadronic Calorimeter (AHCAL). The neural network uses spatial and temporal event information from the AHCAL and energy information, which is expected to improve sensitivity to shower development and the neutron fraction of the hadron shower. The neural network method produced a depth-dependent energy w… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.04632v1-abstract-full').style.display = 'inline'; document.getElementById('2403.04632v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.04632v1-abstract-full" style="display: none;"> A neural network for software compensation was developed for the highly granular CALICE Analogue Hadronic Calorimeter (AHCAL). The neural network uses spatial and temporal event information from the AHCAL and energy information, which is expected to improve sensitivity to shower development and the neutron fraction of the hadron shower. The neural network method produced a depth-dependent energy weighting and a time-dependent threshold for enhancing energy deposits consistent with the timescale of evaporation neutrons. Additionally, it was observed to learn an energy-weighting indicative of longitudinal leakage correction. In addition, the method produced a linear detector response and outperformed a published control method regarding resolution for every particle energy studied. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.04632v1-abstract-full').style.display = 'none'; document.getElementById('2403.04632v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2402.19136">arXiv:2402.19136</a> <span> [<a href="https://arxiv.org/pdf/2402.19136">pdf</a>, <a href="https://arxiv.org/format/2402.19136">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2024.169509">10.1016/j.nima.2024.169509 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Radiation Hardness Studies of RPC Based on Diamond-Like Carbon Electrodes for MEG II Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Takahashi%2C+M">Masato Takahashi</a>, <a href="/search/physics?searchtype=author&query=Ban%2C+S">Sei Ban</a>, <a href="/search/physics?searchtype=author&query=Li%2C+W">Weiyuan Li</a>, <a href="/search/physics?searchtype=author&query=Ochi%2C+A">Atsuhiko Ochi</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">Wataru Ootani</a>, <a href="/search/physics?searchtype=author&query=Oya%2C+A">Atsushi Oya</a>, <a href="/search/physics?searchtype=author&query=Suzuki%2C+H">Hiromu Suzuki</a>, <a href="/search/physics?searchtype=author&query=Yamamoto%2C+K">Kensuke Yamamoto</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2402.19136v3-abstract-short" style="display: inline;"> A novel type of resistive plate chamber, based on diamond-like carbon (DLC) electrodes is under development for background identification in the MEG II experiment. The DLC-RPC is required to have a radiation hardness to mass irradiation since it is planned to be placed in a high-intensity and low-momentum muon beam. In this study, the aging test using a high-intensity X-ray beam was conducted to e… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.19136v3-abstract-full').style.display = 'inline'; document.getElementById('2402.19136v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.19136v3-abstract-full" style="display: none;"> A novel type of resistive plate chamber, based on diamond-like carbon (DLC) electrodes is under development for background identification in the MEG II experiment. The DLC-RPC is required to have a radiation hardness to mass irradiation since it is planned to be placed in a high-intensity and low-momentum muon beam. In this study, the aging test using a high-intensity X-ray beam was conducted to evaluate the radiation hardness of the DLC-RPC. The accumulated charge due to X-ray irradiation reached about 54 C/cm$^2$, which is approximately half of the one-year irradiation dose expected in the MEG II experiment. As a result, the degradation of the gas gain was observed due to fluorine deposition and insulators formed on the DLC electrodes. In addition, discharges via spacers were also observed repeatedly and interrupted the DLC-RPC operation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.19136v3-abstract-full').style.display = 'none'; document.getElementById('2402.19136v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 10 figures. Contribution to 3rd International Conference on Detector Stability and Aging Phenomena in Gaseous Detectors, November 6-10 2023. Submitted to Nuclear Inst. and Methods in Physics Research, A</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> NIM A 1066 (2024) 169509 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2401.13553">arXiv:2401.13553</a> <span> [<a href="https://arxiv.org/pdf/2401.13553">pdf</a>, <a href="https://arxiv.org/format/2401.13553">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Prototype study of $0.1\%\,X_0$ and $\mathrm{MHz/cm^2}$ tolerant Resistive Plate Chamber with Diamond-Like Carbon electrodes </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ieki%2C+K">Kei Ieki</a>, <a href="/search/physics?searchtype=author&query=Li%2C+W">Weiyuan Li</a>, <a href="/search/physics?searchtype=author&query=Ochi%2C+A">Atsuhiko Ochi</a>, <a href="/search/physics?searchtype=author&query=Onda%2C+R">Rina Onda</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">Wataru Ootani</a>, <a href="/search/physics?searchtype=author&query=Oya%2C+A">Atsushi Oya</a>, <a href="/search/physics?searchtype=author&query=Takahashi%2C+M">Masato Takahashi</a>, <a href="/search/physics?searchtype=author&query=Yamamoto%2C+K">Kensuke Yamamoto</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2401.13553v1-abstract-short" style="display: inline;"> A novel Resistive Plate Chamber (RPC) was designed with Diamond-Like Carbon (DLC) electrodes and performance studies were carried out for 384$\,\mathrm{渭m}$ gap configuration with a $2\,\mathrm{cm}\times2\,\mathrm{cm}$ prototype. The use of thin films coated with DLC enables an ultra-low mass design of $< 0.1\%\,X_0$ with up to a four-layer configuration. At the same time, 42% MIP efficiency, and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.13553v1-abstract-full').style.display = 'inline'; document.getElementById('2401.13553v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.13553v1-abstract-full" style="display: none;"> A novel Resistive Plate Chamber (RPC) was designed with Diamond-Like Carbon (DLC) electrodes and performance studies were carried out for 384$\,\mathrm{渭m}$ gap configuration with a $2\,\mathrm{cm}\times2\,\mathrm{cm}$ prototype. The use of thin films coated with DLC enables an ultra-low mass design of $< 0.1\%\,X_0$ with up to a four-layer configuration. At the same time, 42% MIP efficiency, and 180 ps timing resolution per layer were achieved in a measurement performed under a $1\,\mathrm{MHz/cm^2}$ non-MIP charged particle beam. In addition, we propose a further improved design for a $20\,\mathrm{cm}$-scale detector that can achieve 90% four-layer efficiency in an even higher $4\,\mathrm{MHz/cm^2}$ beam. In this paper, we describe the detector design, present the results of performance measurements, and characterize the rate capability of the DLC-based RPCs with a performance projection for an improved design. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.13553v1-abstract-full').style.display = 'none'; document.getElementById('2401.13553v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2310.11902">arXiv:2310.11902</a> <span> [<a href="https://arxiv.org/pdf/2310.11902">pdf</a>, <a href="https://arxiv.org/format/2310.11902">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Operation and performance of MEG II detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=MEG+II+Collaboration"> MEG II Collaboration</a>, <a href="/search/physics?searchtype=author&query=Afanaciev%2C+K">K. Afanaciev</a>, <a href="/search/physics?searchtype=author&query=Baldini%2C+A+M">A. M. Baldini</a>, <a href="/search/physics?searchtype=author&query=Ban%2C+S">S. Ban</a>, <a href="/search/physics?searchtype=author&query=Baranov%2C+V">V. Baranov</a>, <a href="/search/physics?searchtype=author&query=Benmansour%2C+H">H. Benmansour</a>, <a href="/search/physics?searchtype=author&query=Biasotti%2C+M">M. Biasotti</a>, <a href="/search/physics?searchtype=author&query=Boca%2C+G">G. Boca</a>, <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">P. W. Cattaneo</a>, <a href="/search/physics?searchtype=author&query=Cavoto%2C+G">G. Cavoto</a>, <a href="/search/physics?searchtype=author&query=Cei%2C+F">F. Cei</a>, <a href="/search/physics?searchtype=author&query=Chiappini%2C+M">M. Chiappini</a>, <a href="/search/physics?searchtype=author&query=Chiarello%2C+G">G. Chiarello</a>, <a href="/search/physics?searchtype=author&query=Corvaglia%2C+A">A. Corvaglia</a>, <a href="/search/physics?searchtype=author&query=Cuna%2C+F">F. Cuna</a>, <a href="/search/physics?searchtype=author&query=Maso%2C+G+D">G. Dal Maso</a>, <a href="/search/physics?searchtype=author&query=De+Bari%2C+A">A. De Bari</a>, <a href="/search/physics?searchtype=author&query=De+Gerone%2C+M">M. De Gerone</a>, <a href="/search/physics?searchtype=author&query=Barusso%2C+L+F">L. Ferrari Barusso</a>, <a href="/search/physics?searchtype=author&query=Francesconi%2C+M">M. Francesconi</a>, <a href="/search/physics?searchtype=author&query=Galli%2C+L">L. Galli</a>, <a href="/search/physics?searchtype=author&query=Gallucci%2C+G">G. Gallucci</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">F. Gatti</a>, <a href="/search/physics?searchtype=author&query=Gerritzen%2C+L">L. Gerritzen</a>, <a href="/search/physics?searchtype=author&query=Grancagnolo%2C+F">F. Grancagnolo</a> , et al. (60 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2310.11902v3-abstract-short" style="display: inline;"> The MEG II experiment, located at the Paul Scherrer Institut (PSI) in Switzerland, is the successor to the MEG experiment, which completed data taking in 2013. MEG II started fully operational data taking in 2021, with the goal of improving the sensitivity of the mu+ -> e+ gamma decay down to 6e-14 almost an order of magnitude better than the current limit. In this paper, we describe the operation… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.11902v3-abstract-full').style.display = 'inline'; document.getElementById('2310.11902v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2310.11902v3-abstract-full" style="display: none;"> The MEG II experiment, located at the Paul Scherrer Institut (PSI) in Switzerland, is the successor to the MEG experiment, which completed data taking in 2013. MEG II started fully operational data taking in 2021, with the goal of improving the sensitivity of the mu+ -> e+ gamma decay down to 6e-14 almost an order of magnitude better than the current limit. In this paper, we describe the operation and performance of the experiment and give a new estimate of its sensitivity versus data acquisition time. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.11902v3-abstract-full').style.display = 'none'; document.getElementById('2310.11902v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">42 pages, 55 figures. Submitted to EPJC</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2309.05933">arXiv:2309.05933</a> <span> [<a href="https://arxiv.org/pdf/2309.05933">pdf</a>, <a href="https://arxiv.org/format/2309.05933">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> </div> </div> <p class="title is-5 mathjax"> Workshop on a future muon program at FNAL </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Corrodi%2C+S">S. Corrodi</a>, <a href="/search/physics?searchtype=author&query=Oksuzian%2C+Y">Y. Oksuzian</a>, <a href="/search/physics?searchtype=author&query=Edmonds%2C+A">A. Edmonds</a>, <a href="/search/physics?searchtype=author&query=Miller%2C+J">J. Miller</a>, <a href="/search/physics?searchtype=author&query=Tran%2C+H+N">H. N. Tran</a>, <a href="/search/physics?searchtype=author&query=Bonventre%2C+R">R. Bonventre</a>, <a href="/search/physics?searchtype=author&query=Brown%2C+D+N">D. N. Brown</a>, <a href="/search/physics?searchtype=author&query=Meot%2C+F">F. Meot</a>, <a href="/search/physics?searchtype=author&query=Singh%2C+V">V. Singh</a>, <a href="/search/physics?searchtype=author&query=Kolomensky%2C+Y">Y. Kolomensky</a>, <a href="/search/physics?searchtype=author&query=Tripathy%2C+S">S. Tripathy</a>, <a href="/search/physics?searchtype=author&query=Borrel%2C+L">L. Borrel</a>, <a href="/search/physics?searchtype=author&query=Bub%2C+M">M. Bub</a>, <a href="/search/physics?searchtype=author&query=Echenard%2C+B">B. Echenard</a>, <a href="/search/physics?searchtype=author&query=Hitlin%2C+D+G">D. G. Hitlin</a>, <a href="/search/physics?searchtype=author&query=Jafree%2C+H">H. Jafree</a>, <a href="/search/physics?searchtype=author&query=Middleton%2C+S">S. Middleton</a>, <a href="/search/physics?searchtype=author&query=Plestid%2C+R">R. Plestid</a>, <a href="/search/physics?searchtype=author&query=Porter%2C+F+C">F. C. Porter</a>, <a href="/search/physics?searchtype=author&query=Zhu%2C+R+Y">R. Y. Zhu</a>, <a href="/search/physics?searchtype=author&query=Bottura%2C+L">L. Bottura</a>, <a href="/search/physics?searchtype=author&query=Pinsard%2C+E">E. Pinsard</a>, <a href="/search/physics?searchtype=author&query=Teixeira%2C+A+M">A. M. Teixeira</a>, <a href="/search/physics?searchtype=author&query=Carelli%2C+C">C. Carelli</a>, <a href="/search/physics?searchtype=author&query=Ambrose%2C+D">D. Ambrose</a> , et al. (68 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2309.05933v1-abstract-short" style="display: inline;"> The Snowmass report on rare processes and precision measurements recommended Mu2e-II and a next generation muon facility at Fermilab (Advanced Muon Facility) as priorities for the frontier. The Workshop on a future muon program at FNAL was held in March 2023 to discuss design studies for Mu2e-II, organizing efforts for the next generation muon facility, and identify synergies with other efforts (e… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.05933v1-abstract-full').style.display = 'inline'; document.getElementById('2309.05933v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2309.05933v1-abstract-full" style="display: none;"> The Snowmass report on rare processes and precision measurements recommended Mu2e-II and a next generation muon facility at Fermilab (Advanced Muon Facility) as priorities for the frontier. The Workshop on a future muon program at FNAL was held in March 2023 to discuss design studies for Mu2e-II, organizing efforts for the next generation muon facility, and identify synergies with other efforts (e.g., muon collider). Topics included high-power targetry, status of R&D for Mu2e-II, development of compressor rings, FFA and concepts for muon experiments (conversion, decays, muonium and other opportunities) at AMF. This document summarizes the workshop discussions with a focus on future R&D tasks needed to realize these concepts. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.05933v1-abstract-full').style.display = 'none'; document.getElementById('2309.05933v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 September, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">68 pages, 36 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-CONF-23-464-PPD, CALT-TH-2023-036 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.12172">arXiv:2211.12172</a> <span> [<a href="https://arxiv.org/pdf/2211.12172">pdf</a>, <a href="https://arxiv.org/format/2211.12172">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2023.168450">10.1016/j.nima.2023.168450 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Development of ultra-low mass and high-rate capable RPC based on Diamond-Like Carbon electrodes for MEG II experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Yamamoto%2C+K">Kensuke Yamamoto</a>, <a href="/search/physics?searchtype=author&query=Ban%2C+S">Sei Ban</a>, <a href="/search/physics?searchtype=author&query=Ieki%2C+K">Kei Ieki</a>, <a href="/search/physics?searchtype=author&query=Ochi%2C+A">Atsuhiko Ochi</a>, <a href="/search/physics?searchtype=author&query=Onda%2C+R">Rina Onda</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">Wataru Ootani</a>, <a href="/search/physics?searchtype=author&query=Oya%2C+A">Atsushi Oya</a>, <a href="/search/physics?searchtype=author&query=Takahashi%2C+M">Masato Takahashi</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2211.12172v2-abstract-short" style="display: inline;"> A new type of resistive plate chamber with thin-film electrodes based on diamond-like carbon is under development for background identification in the MEG II experiment. Installed in a low-momentum and high-intensity muon beam, the detector is required to have extremely low mass and a high rate capability. A single-layer prototype detector with 2 cm $\times$ 2 cm size was constructed and evaluated… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.12172v2-abstract-full').style.display = 'inline'; document.getElementById('2211.12172v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.12172v2-abstract-full" style="display: none;"> A new type of resistive plate chamber with thin-film electrodes based on diamond-like carbon is under development for background identification in the MEG II experiment. Installed in a low-momentum and high-intensity muon beam, the detector is required to have extremely low mass and a high rate capability. A single-layer prototype detector with 2 cm $\times$ 2 cm size was constructed and evaluated to have a high rate capability of 1 MHz/cm$^2$ low-momentum muons. For a higher rate capability and scalability of the detector size, the electrodes to supply high voltage were segmented at a 1 cm pitch by implementing a conductive pattern on diamond-like carbon. Using the new electrodes, a four-layer prototype detector was constructed and evaluated to have a 46% detection efficiency with only a single layer active at a rate of $\cal O$(10 kHz). The result with the new electrodes is promising to achieve the required detection efficiency of 90% at a rate of 4 MHz/cm$^2$ with all the layers active. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.12172v2-abstract-full').style.display = 'none'; document.getElementById('2211.12172v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 8 figures. Contribution to XVI Workshop on Resistive Plate Chambers and Related Detectors (RPC2022), September 26-30 2022. Submitted to Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.09882">arXiv:2211.09882</a> <span> [<a href="https://arxiv.org/pdf/2211.09882">pdf</a>, <a href="https://arxiv.org/format/2211.09882">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2023.168365">10.1016/j.nima.2023.168365 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Study on degradation of VUV-sensitivity of MPPC for liquid xenon scintillation detector by radiation damage in MEG II experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ieki%2C+K">K. Ieki</a>, <a href="/search/physics?searchtype=author&query=Iwamoto%2C+T">T. Iwamoto</a>, <a href="/search/physics?searchtype=author&query=Kobayashi%2C+S">S. Kobayashi</a>, <a href="/search/physics?searchtype=author&query=Mori%2C+T">Toshinori Mori</a>, <a href="/search/physics?searchtype=author&query=Ogawa%2C+S">S. Ogawa</a>, <a href="/search/physics?searchtype=author&query=Onda%2C+R">R. Onda</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">W. Ootani</a>, <a href="/search/physics?searchtype=author&query=Shimada%2C+K">K. Shimada</a>, <a href="/search/physics?searchtype=author&query=Toyoda%2C+K">K. Toyoda</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2211.09882v1-abstract-short" style="display: inline;"> In the MEG II experiment, the liquid xenon gamma-ray detector uses Multi-Pixel Photon Counters (MPPC) which are sensitive to vacuum ultraviolet (VUV) light under a high-intensity muon beam environment. In the commissioning phase of the detector with the beam, a significant degradation in the photon detection efficiency (PDE) for VUV light was found, while the degradation in the PDE for visible lig… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.09882v1-abstract-full').style.display = 'inline'; document.getElementById('2211.09882v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.09882v1-abstract-full" style="display: none;"> In the MEG II experiment, the liquid xenon gamma-ray detector uses Multi-Pixel Photon Counters (MPPC) which are sensitive to vacuum ultraviolet (VUV) light under a high-intensity muon beam environment. In the commissioning phase of the detector with the beam, a significant degradation in the photon detection efficiency (PDE) for VUV light was found, while the degradation in the PDE for visible light was much less significant. This implies that the radiation damage is localized to the surface of the MPPC where incoming VUV photons create electron-hole pairs. It was also found that the PDE can recover to the original level by thermal annealing. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.09882v1-abstract-full').style.display = 'none'; document.getElementById('2211.09882v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">17 pages, 11 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.13979">arXiv:2203.13979</a> <span> [<a href="https://arxiv.org/pdf/2203.13979">pdf</a>, <a href="https://arxiv.org/format/2203.13979">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Japan's Strategy for Future Projects in High Energy Physics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Endo%2C+M">M. Endo</a>, <a href="/search/physics?searchtype=author&query=Hamaguchi%2C+K">K. Hamaguchi</a>, <a href="/search/physics?searchtype=author&query=Ibe%2C+M">M. Ibe</a>, <a href="/search/physics?searchtype=author&query=Ishibashi%2C+T">T. Ishibashi</a>, <a href="/search/physics?searchtype=author&query=Ishikawa%2C+A">A. Ishikawa</a>, <a href="/search/physics?searchtype=author&query=Ishino%2C+M">M. Ishino</a>, <a href="/search/physics?searchtype=author&query=Ishitsuka%2C+M">M. Ishitsuka</a>, <a href="/search/physics?searchtype=author&query=Kanemura%2C+S">S. Kanemura</a>, <a href="/search/physics?searchtype=author&query=Kuriki%2C+M">M. Kuriki</a>, <a href="/search/physics?searchtype=author&query=Mori%2C+T">T. Mori</a>, <a href="/search/physics?searchtype=author&query=Moriyama%2C+S">S. Moriyama</a>, <a href="/search/physics?searchtype=author&query=Nanjo%2C+H">H. Nanjo</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">W. Ootani</a>, <a href="/search/physics?searchtype=author&query=Sato%2C+Y">Y. Sato</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2203.13979v1-abstract-short" style="display: inline;"> The current strategy for future projects of the Japanese high energy physics community, Japan Association of High Energy Physicists (JAHEP), remains as described in the Final Report of the Committee on Future Projects in High Energy Physics, published in 2017. The Recommendation part of the Final Report is excerpted in the following page. This document updates the Final Report by adding developmen… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.13979v1-abstract-full').style.display = 'inline'; document.getElementById('2203.13979v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.13979v1-abstract-full" style="display: none;"> The current strategy for future projects of the Japanese high energy physics community, Japan Association of High Energy Physicists (JAHEP), remains as described in the Final Report of the Committee on Future Projects in High Energy Physics, published in 2017. The Recommendation part of the Final Report is excerpted in the following page. This document updates the Final Report by adding developments and advances that have occurred since 2017. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.13979v1-abstract-full').style.display = 'none'; document.getElementById('2203.13979v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Submitted to the Proceedings of the US Community Study on the Future of Particle Physics (Snowmass 2021)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.07622">arXiv:2203.07622</a> <span> [<a href="https://arxiv.org/pdf/2203.07622">pdf</a>, <a href="https://arxiv.org/format/2203.07622">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> </div> <p class="title is-5 mathjax"> The International Linear Collider: Report to Snowmass 2021 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Aryshev%2C+A">Alexander Aryshev</a>, <a href="/search/physics?searchtype=author&query=Behnke%2C+T">Ties Behnke</a>, <a href="/search/physics?searchtype=author&query=Berggren%2C+M">Mikael Berggren</a>, <a href="/search/physics?searchtype=author&query=Brau%2C+J">James Brau</a>, <a href="/search/physics?searchtype=author&query=Craig%2C+N">Nathaniel Craig</a>, <a href="/search/physics?searchtype=author&query=Freitas%2C+A">Ayres Freitas</a>, <a href="/search/physics?searchtype=author&query=Gaede%2C+F">Frank Gaede</a>, <a href="/search/physics?searchtype=author&query=Gessner%2C+S">Spencer Gessner</a>, <a href="/search/physics?searchtype=author&query=Gori%2C+S">Stefania Gori</a>, <a href="/search/physics?searchtype=author&query=Grojean%2C+C">Christophe Grojean</a>, <a href="/search/physics?searchtype=author&query=Heinemeyer%2C+S">Sven Heinemeyer</a>, <a href="/search/physics?searchtype=author&query=Jeans%2C+D">Daniel Jeans</a>, <a href="/search/physics?searchtype=author&query=Kruger%2C+K">Katja Kruger</a>, <a href="/search/physics?searchtype=author&query=List%2C+B">Benno List</a>, <a href="/search/physics?searchtype=author&query=List%2C+J">Jenny List</a>, <a href="/search/physics?searchtype=author&query=Liu%2C+Z">Zhen Liu</a>, <a href="/search/physics?searchtype=author&query=Michizono%2C+S">Shinichiro Michizono</a>, <a href="/search/physics?searchtype=author&query=Miller%2C+D+W">David W. Miller</a>, <a href="/search/physics?searchtype=author&query=Moult%2C+I">Ian Moult</a>, <a href="/search/physics?searchtype=author&query=Murayama%2C+H">Hitoshi Murayama</a>, <a href="/search/physics?searchtype=author&query=Nakada%2C+T">Tatsuya Nakada</a>, <a href="/search/physics?searchtype=author&query=Nanni%2C+E">Emilio Nanni</a>, <a href="/search/physics?searchtype=author&query=Nojiri%2C+M">Mihoko Nojiri</a>, <a href="/search/physics?searchtype=author&query=Padamsee%2C+H">Hasan Padamsee</a>, <a href="/search/physics?searchtype=author&query=Perelstein%2C+M">Maxim Perelstein</a> , et al. (487 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2203.07622v3-abstract-short" style="display: inline;"> The International Linear Collider (ILC) is on the table now as a new global energy-frontier accelerator laboratory taking data in the 2030s. The ILC addresses key questions for our current understanding of particle physics. It is based on a proven accelerator technology. Its experiments will challenge the Standard Model of particle physics and will provide a new window to look beyond it. This docu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.07622v3-abstract-full').style.display = 'inline'; document.getElementById('2203.07622v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.07622v3-abstract-full" style="display: none;"> The International Linear Collider (ILC) is on the table now as a new global energy-frontier accelerator laboratory taking data in the 2030s. The ILC addresses key questions for our current understanding of particle physics. It is based on a proven accelerator technology. Its experiments will challenge the Standard Model of particle physics and will provide a new window to look beyond it. This document brings the story of the ILC up to date, emphasizing its strong physics motivation, its readiness for construction, and the opportunity it presents to the US and the global particle physics community. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.07622v3-abstract-full').style.display = 'none'; document.getElementById('2203.07622v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">356 pages, Large pdf file (40 MB) submitted to Snowmass 2021; v2 references to Snowmass contributions added, additional authors; v3 references added, some updates, additional authors</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> DESY-22-045, IFT--UAM/CSIC--22-028, KEK Preprint 2021-61, PNNL-SA-160884, SLAC-PUB-17662 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.05505">arXiv:2203.05505</a> <span> [<a href="https://arxiv.org/pdf/2203.05505">pdf</a>, <a href="https://arxiv.org/format/2203.05505">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Testing Lepton Flavor Universality and CKM Unitarity with Rare Pion Decays in the PIONEER experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=PIONEER+Collaboration"> PIONEER Collaboration</a>, <a href="/search/physics?searchtype=author&query=Altmannshofer%2C+W">W. Altmannshofer</a>, <a href="/search/physics?searchtype=author&query=Binney%2C+H">H. Binney</a>, <a href="/search/physics?searchtype=author&query=Blucher%2C+E">E. Blucher</a>, <a href="/search/physics?searchtype=author&query=Bryman%2C+D">D. Bryman</a>, <a href="/search/physics?searchtype=author&query=Caminada%2C+L">L. Caminada</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+S">S. Chen</a>, <a href="/search/physics?searchtype=author&query=Cirigliano%2C+V">V. Cirigliano</a>, <a href="/search/physics?searchtype=author&query=Corrodi%2C+S">S. Corrodi</a>, <a href="/search/physics?searchtype=author&query=Crivellin%2C+A">A. Crivellin</a>, <a href="/search/physics?searchtype=author&query=Cuen-Rochin%2C+S">S. Cuen-Rochin</a>, <a href="/search/physics?searchtype=author&query=Di+Canto%2C+A">A. Di Canto</a>, <a href="/search/physics?searchtype=author&query=Doria%2C+L">L. Doria</a>, <a href="/search/physics?searchtype=author&query=Gaponenko%2C+A">A. Gaponenko</a>, <a href="/search/physics?searchtype=author&query=Garcia%2C+A">A. Garcia</a>, <a href="/search/physics?searchtype=author&query=Gibbons%2C+L">L. Gibbons</a>, <a href="/search/physics?searchtype=author&query=Glaser%2C+C">C. Glaser</a>, <a href="/search/physics?searchtype=author&query=Godoy%2C+M+E">M. Escobar Godoy</a>, <a href="/search/physics?searchtype=author&query=G%C3%B6ldi%2C+D">D. G枚ldi</a>, <a href="/search/physics?searchtype=author&query=Gori%2C+S">S. Gori</a>, <a href="/search/physics?searchtype=author&query=Gorringe%2C+T">T. Gorringe</a>, <a href="/search/physics?searchtype=author&query=Hertzog%2C+D">D. Hertzog</a>, <a href="/search/physics?searchtype=author&query=Hodge%2C+Z">Z. Hodge</a>, <a href="/search/physics?searchtype=author&query=Hoferichter%2C+M">M. Hoferichter</a>, <a href="/search/physics?searchtype=author&query=Ito%2C+S">S. Ito</a> , et al. (36 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2203.05505v1-abstract-short" style="display: inline;"> The physics motivation and the conceptual design of the PIONEER experiment, a next-generation rare pion decay experiment testing lepton flavor universality and CKM unitarity, are described. Phase I of the PIONEER experiment, which was proposed and approved at Paul Scherrer Institut, aims at measuring the charged-pion branching ratio to electrons vs.\ muons, $R_{e/渭}$, 15 times more precisely than… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.05505v1-abstract-full').style.display = 'inline'; document.getElementById('2203.05505v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.05505v1-abstract-full" style="display: none;"> The physics motivation and the conceptual design of the PIONEER experiment, a next-generation rare pion decay experiment testing lepton flavor universality and CKM unitarity, are described. Phase I of the PIONEER experiment, which was proposed and approved at Paul Scherrer Institut, aims at measuring the charged-pion branching ratio to electrons vs.\ muons, $R_{e/渭}$, 15 times more precisely than the current experimental result, reaching the precision of the Standard Model (SM) prediction at 1 part in $10^4$. Considering several inconsistencies between the SM predictions and data pointing towards the potential violation of lepton flavor universality, the PIONEER experiment will probe non-SM explanations of these anomalies through sensitivity to quantum effects of new particles up to the PeV mass scale. The later phases of the PIONEER experiment aim at improving the experimental precision of the branching ratio of pion beta decay (BRPB), $蟺^+\to 蟺^0 e^+ 谓(纬)$, currently at $1.036(6)\times10^{-8}$, by a factor of three (Phase II) and an order of magnitude (Phase III). Such precise measurements of BRPB will allow for tests of CKM unitarity in light of the Cabibbo Angle Anomaly and the theoretically cleanest extraction of $|V_{ud}|$ at the 0.02\% level, comparable to the deduction from superallowed beta decays. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.05505v1-abstract-full').style.display = 'none'; document.getElementById('2203.05505v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">contribution to Snowmass 2021 based on the PIONEER proposal (arXiv:2203.01981)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.01981">arXiv:2203.01981</a> <span> [<a href="https://arxiv.org/pdf/2203.01981">pdf</a>, <a href="https://arxiv.org/format/2203.01981">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> PIONEER: Studies of Rare Pion Decays </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=PIONEER+Collaboration"> PIONEER Collaboration</a>, <a href="/search/physics?searchtype=author&query=Altmannshofer%2C+W">W. Altmannshofer</a>, <a href="/search/physics?searchtype=author&query=Binney%2C+H">H. Binney</a>, <a href="/search/physics?searchtype=author&query=Blucher%2C+E">E. Blucher</a>, <a href="/search/physics?searchtype=author&query=Bryman%2C+D">D. Bryman</a>, <a href="/search/physics?searchtype=author&query=Caminada%2C+L">L. Caminada</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+S">S. Chen</a>, <a href="/search/physics?searchtype=author&query=Cirigliano%2C+V">V. Cirigliano</a>, <a href="/search/physics?searchtype=author&query=Corrodi%2C+S">S. Corrodi</a>, <a href="/search/physics?searchtype=author&query=Crivellin%2C+A">A. Crivellin</a>, <a href="/search/physics?searchtype=author&query=Cuen-Rochin%2C+S">S. Cuen-Rochin</a>, <a href="/search/physics?searchtype=author&query=DiCanto%2C+A">A. DiCanto</a>, <a href="/search/physics?searchtype=author&query=Doria%2C+L">L. Doria</a>, <a href="/search/physics?searchtype=author&query=Gaponenko%2C+A">A. Gaponenko</a>, <a href="/search/physics?searchtype=author&query=Garcia%2C+A">A. Garcia</a>, <a href="/search/physics?searchtype=author&query=Gibbons%2C+L">L. Gibbons</a>, <a href="/search/physics?searchtype=author&query=Glaser%2C+C">C. Glaser</a>, <a href="/search/physics?searchtype=author&query=Godoy%2C+M+E">M. Escobar Godoy</a>, <a href="/search/physics?searchtype=author&query=G%C3%B6ldi%2C+D">D. G枚ldi</a>, <a href="/search/physics?searchtype=author&query=Gori%2C+S">S. Gori</a>, <a href="/search/physics?searchtype=author&query=Gorringe%2C+T">T. Gorringe</a>, <a href="/search/physics?searchtype=author&query=Hertzog%2C+D">D. Hertzog</a>, <a href="/search/physics?searchtype=author&query=Hodge%2C+Z">Z. Hodge</a>, <a href="/search/physics?searchtype=author&query=Hoferichter%2C+M">M. Hoferichter</a>, <a href="/search/physics?searchtype=author&query=Ito%2C+S">S. Ito</a> , et al. (36 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2203.01981v2-abstract-short" style="display: inline;"> A next-generation rare pion decay experiment, PIONEER, is strongly motivated by several inconsistencies between Standard Model (SM) predictions and data pointing towards the potential violation of lepton flavor universality. It will probe non-SM explanations of these anomalies through sensitivity to quantum effects of new particles even if their masses are at very high scales. Measurement of the c… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.01981v2-abstract-full').style.display = 'inline'; document.getElementById('2203.01981v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.01981v2-abstract-full" style="display: none;"> A next-generation rare pion decay experiment, PIONEER, is strongly motivated by several inconsistencies between Standard Model (SM) predictions and data pointing towards the potential violation of lepton flavor universality. It will probe non-SM explanations of these anomalies through sensitivity to quantum effects of new particles even if their masses are at very high scales. Measurement of the charged-pion branching ratio to electrons vs. muons $R_{e/渭}$ is extremely sensitive to new physics effects. At present, the SM prediction for $R_{e/渭}$ is known to 1 part in $10^4$, which is 15 times more precise than the current experimental result. An experiment reaching the theoretical accuracy will test lepton flavor universality at an unprecedented level, probing mass scales up to the PeV range. Measurement of pion beta decay, $蟺^+\to 蟺^0 e^+ 谓(纬)$, with 3 to 10-fold improvement in sensitivity, will determine $V_{ud}$ in a theoretically pristine manner and test CKM unitarity, which is very important in light of the recently emerged tensions. In addition, various exotic rare decays involving sterile neutrinos and axions will be searched for with unprecedented sensitivity. The experiment design benefits from experience with the recent PIENU and PEN experiments at TRIUMF and the Paul Scherrer Institut (PSI). Excellent energy and time resolutions, greatly increased calorimeter depth, high-speed detector and electronics response, large solid angle coverage, and complete event reconstruction are all critical aspects of the approach. The PIONEER experiment design includes a 3$蟺$ sr 25 radiation length calorimeter, a segmented low gain avalanche detector stopping target, a positron tracker, and other detectors. Using intense pion beams, and state-of-the-art instrumentation and computational resources, the experiments can be performed at the PSI ring cyclotron. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.01981v2-abstract-full').style.display = 'none'; document.getElementById('2203.01981v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 3 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2109.13525">arXiv:2109.13525</a> <span> [<a href="https://arxiv.org/pdf/2109.13525">pdf</a>, <a href="https://arxiv.org/format/2109.13525">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-6596/2374/1/012143">10.1088/1742-6596/2374/1/012143 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Development of high-rate capable and ultra-low mass Resistive Plate Chamber with Diamond-Like Carbon </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Oya%2C+A">Atsushi Oya</a>, <a href="/search/physics?searchtype=author&query=Ieki%2C+K">Kei Ieki</a>, <a href="/search/physics?searchtype=author&query=Ochi%2C+A">Atsuhiko Ochi</a>, <a href="/search/physics?searchtype=author&query=Onda%2C+R">Rina Onda</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">Wataru Ootani</a>, <a href="/search/physics?searchtype=author&query=Yamamoto%2C+K">Kensuke Yamamoto</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2109.13525v1-abstract-short" style="display: inline;"> A new type of resistive plate chamber (RPC) is under development using thin-film resistive electrodes based on diamond-like carbon (DLC). Planned to be put on the path of high-intensity low-momentum muon beam of the MEG II experiment, this detector is required to be high-rate capable and ultra-low mass. Using a prototype detector with 2 cm $\times$ 2 cm size and 0.1 % $X_0$ material budget, perfor… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.13525v1-abstract-full').style.display = 'inline'; document.getElementById('2109.13525v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2109.13525v1-abstract-full" style="display: none;"> A new type of resistive plate chamber (RPC) is under development using thin-film resistive electrodes based on diamond-like carbon (DLC). Planned to be put on the path of high-intensity low-momentum muon beam of the MEG II experiment, this detector is required to be high-rate capable and ultra-low mass. Using a prototype detector with 2 cm $\times$ 2 cm size and 0.1 % $X_0$ material budget, performance studies were conducted for MIP detection efficiency, timing resolution and high rate capability in low-momentum muon beam. In this paper, the measured performance is presented including the result with low-momentum muon beam at rate up to 1 $\mathrm{MHz/cm^2}$. Based on the result, the expected performance of the full-scale detector in the MEG~II experiment is also discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.13525v1-abstract-full').style.display = 'none'; document.getElementById('2109.13525v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 September, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 8 figures. Contribution to the International Conference on Technology and Instrumentation in Particle Physics (TIPP 2021), May 24-28 2021. Submitted to Journal of Physics: Conference Series</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2107.10767">arXiv:2107.10767</a> <span> [<a href="https://arxiv.org/pdf/2107.10767">pdf</a>, <a href="https://arxiv.org/format/2107.10767">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.3390/sym13091591">10.3390/sym13091591 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Search for $渭^+\to e^+ 纬$ with 10$^{-14}$ Sensitivity: the Upgrade of the MEG Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=The+MEG+II+Collaboration"> The MEG II Collaboration</a>, <a href="/search/physics?searchtype=author&query=Baldini%2C+A+M">Alessandro M. Baldini</a>, <a href="/search/physics?searchtype=author&query=Baranov%2C+V">Vladimir Baranov</a>, <a href="/search/physics?searchtype=author&query=Biasotti%2C+M">Michele Biasotti</a>, <a href="/search/physics?searchtype=author&query=Boca%2C+G">Gianluigi Boca</a>, <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">Paolo W. Cattaneo</a>, <a href="/search/physics?searchtype=author&query=Cavoto%2C+G">Gianluca Cavoto</a>, <a href="/search/physics?searchtype=author&query=Cei%2C+F">Fabrizio Cei</a>, <a href="/search/physics?searchtype=author&query=Chiappini%2C+M">Marco Chiappini</a>, <a href="/search/physics?searchtype=author&query=Chiarello%2C+G">Gianluigi Chiarello</a>, <a href="/search/physics?searchtype=author&query=Corvaglia%2C+A">Alessandro Corvaglia</a>, <a href="/search/physics?searchtype=author&query=Cuna%2C+F">Federica Cuna</a>, <a href="/search/physics?searchtype=author&query=Maso%2C+G+d">Giovanni dal Maso</a>, <a href="/search/physics?searchtype=author&query=de+Bari%2C+A">Antonio de Bari</a>, <a href="/search/physics?searchtype=author&query=De+Gerone%2C+M">Matteo De Gerone</a>, <a href="/search/physics?searchtype=author&query=Francesconi%2C+M">Marco Francesconi</a>, <a href="/search/physics?searchtype=author&query=Galli%2C+L">Luca Galli</a>, <a href="/search/physics?searchtype=author&query=Gallucci%2C+G">Giovanni Gallucci</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">Flavio Gatti</a>, <a href="/search/physics?searchtype=author&query=Grancagnolo%2C+F">Francesco Grancagnolo</a>, <a href="/search/physics?searchtype=author&query=Grassi%2C+M">Marco Grassi</a>, <a href="/search/physics?searchtype=author&query=Grigoriev%2C+D+N">Dmitry N. Grigoriev</a>, <a href="/search/physics?searchtype=author&query=Hildebrandt%2C+M">Malte Hildebrandt</a>, <a href="/search/physics?searchtype=author&query=Ieki%2C+K">Kei Ieki</a>, <a href="/search/physics?searchtype=author&query=Ignatov%2C+F">Fedor Ignatov</a> , et al. (45 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2107.10767v2-abstract-short" style="display: inline;"> The MEG experiment took data at the Paul Scherrer Institute in the years 2009--2013 to test the violation of the lepton flavour conservation law, which originates from an accidental symmetry that the Standard Model of elementary particle physics has, and published the most stringent limit on the charged lepton flavour violating decay $渭^+ \rightarrow {\rm e}^+ 纬$: BR($渭^+ \rightarrow {\rm e}^+ 纬$)… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.10767v2-abstract-full').style.display = 'inline'; document.getElementById('2107.10767v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2107.10767v2-abstract-full" style="display: none;"> The MEG experiment took data at the Paul Scherrer Institute in the years 2009--2013 to test the violation of the lepton flavour conservation law, which originates from an accidental symmetry that the Standard Model of elementary particle physics has, and published the most stringent limit on the charged lepton flavour violating decay $渭^+ \rightarrow {\rm e}^+ 纬$: BR($渭^+ \rightarrow {\rm e}^+ 纬$) $<4.2 \times 10^{-13}$ at 90% confidence level. The MEG detector has been upgraded in order to reach a sensitivity of $6\times10^{-14}$. The basic principle of MEG II is to achieve the highest possible sensitivity using the full muon beam intensity at the Paul Scherrer Institute ($7\times10^{7}$ muons/s) with an upgraded detector. The main improvements are better rate capability of all sub-detectors and improved resolutions while keeping the same detector concept. In this paper, we present the current status of the preparation, integration and commissioning of the MEG II detector in the recent engineering runs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.10767v2-abstract-full').style.display = 'none'; document.getElementById('2107.10767v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 September, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 4 figures. The version of acceptance for Symmetry</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Symmetry 2021, 13(9), 1591 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2005.05027">arXiv:2005.05027</a> <span> [<a href="https://arxiv.org/pdf/2005.05027">pdf</a>, <a href="https://arxiv.org/ps/2005.05027">ps</a>, <a href="https://arxiv.org/format/2005.05027">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Timing resolution of a plastic scintillator counter read out by radiation damaged SiPMs connected in series </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Boca%2C+G">G. Boca</a>, <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">P. W. Cattaneo</a>, <a href="/search/physics?searchtype=author&query=De+Gerone%2C+M">M. De Gerone</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">F. Gatti</a>, <a href="/search/physics?searchtype=author&query=Nakao%2C+M">M. Nakao</a>, <a href="/search/physics?searchtype=author&query=Nishimura%2C+M">M. Nishimura</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">W. Ootani</a>, <a href="/search/physics?searchtype=author&query=Rossella%2C+M">M. Rossella</a>, <a href="/search/physics?searchtype=author&query=Uchiyama%2C+Y">Y. Uchiyama</a>, <a href="/search/physics?searchtype=author&query=Usami%2C+M">M. Usami</a>, <a href="/search/physics?searchtype=author&query=Yanai%2C+K">K. Yanai</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2005.05027v2-abstract-short" style="display: inline;"> This paper discusses the effects of radiation damage to SiPMs on the performances of plastic scintillator counters with series-connected SiPM readout, focusing on timing measurements. The performances of a counter composed of a $120 \times 40 \times5~\mathrm{mm}^3$ scintillator tile read out by two sets of six SiPMs from AdvanSiD connected in series attached on the short sides are presented, for d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.05027v2-abstract-full').style.display = 'inline'; document.getElementById('2005.05027v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2005.05027v2-abstract-full" style="display: none;"> This paper discusses the effects of radiation damage to SiPMs on the performances of plastic scintillator counters with series-connected SiPM readout, focusing on timing measurements. The performances of a counter composed of a $120 \times 40 \times5~\mathrm{mm}^3$ scintillator tile read out by two sets of six SiPMs from AdvanSiD connected in series attached on the short sides are presented, for different combinations of SiPMs at various levels of irradiation. Firstly, six SiPMs were equally irradiated with electrons from $^{90}$Sr sources up to a fluence of $桅_\mathrm{e^-}\approx 3 \times 10^{12}~\mathrm{cm}^{-2}$. The timing resolution of the counter gradually deteriorated by the increase in dark current. The dark current and the deterioration were reduced when the counter was cooled from 30$^\circ$C to 10$^\circ$C. Secondly, 33 SiPMs were irradiated with reactor neutrons. The characteristics of counters read out by series-connected SiPMs with non-uniform damage levels, were investigated. The signal pulse height, the time response, and the timing resolution depend on the hit position in the counter, when SiPMs' irradiation is not uniform. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.05027v2-abstract-full').style.display = 'none'; document.getElementById('2005.05027v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 October, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 27 figures, Major revision based on the reviewers' comments</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2002.06415">arXiv:2002.06415</a> <span> [<a href="https://arxiv.org/pdf/2002.06415">pdf</a>, <a href="https://arxiv.org/format/2002.06415">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Optimization study of scintillator shape of electromagnetic calorimeter for Higgs factories </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Mogi%2C+T">Takanori Mogi</a>, <a href="/search/physics?searchtype=author&query=Tanabe%2C+T">Tomohiko Tanabe</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">Wataru Ootani</a>, <a href="/search/physics?searchtype=author&query=Yamashita%2C+S">Satoru Yamashita</a>, <a href="/search/physics?searchtype=author&query=Shirai%2C+R">Ryousuke Shirai</a>, <a href="/search/physics?searchtype=author&query=Takeshita%2C+T">Tohru Takeshita</a>, <a href="/search/physics?searchtype=author&query=Niu%2C+Y">Yazhou Niu</a>, <a href="/search/physics?searchtype=author&query=Liu%2C+J">Jianbei Liu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2002.06415v1-abstract-short" style="display: inline;"> Scintillator-based calorimeters for experiments at Higgs factories (e.g. ILC) demand scintillator designs that can detect sufficient number of photons and have good light yield uniformity, and that they can be easily mass-produced. In order to meet these requirements, scintillator strips with a small dimple has been proposed. In our study, we measure the light yield of a dimple scintillator sample… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.06415v1-abstract-full').style.display = 'inline'; document.getElementById('2002.06415v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2002.06415v1-abstract-full" style="display: none;"> Scintillator-based calorimeters for experiments at Higgs factories (e.g. ILC) demand scintillator designs that can detect sufficient number of photons and have good light yield uniformity, and that they can be easily mass-produced. In order to meet these requirements, scintillator strips with a small dimple has been proposed. In our study, we measure the light yield of a dimple scintillator sample; we then compare the measurements with light tracing simulation using GEANT4. We intend to use our results to propose an optimized scintillator shape. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.06415v1-abstract-full').style.display = 'none'; document.getElementById('2002.06415v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 February, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">3 pages, 6 figures. Talk presented at the International Workshop on Future Linear Colliders (LCWS2019), Sendai, Japan, 28 October-1 November, 2019. C19-10-28</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1907.00911">arXiv:1907.00911</a> <span> [<a href="https://arxiv.org/pdf/1907.00911">pdf</a>, <a href="https://arxiv.org/format/1907.00911">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2019.162672">10.1016/j.nima.2019.162672 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The laser-based time calibration system for the MEG II pixelated Timing Counter </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Boca%2C+G">G. Boca</a>, <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">P. W. Cattaneo</a>, <a href="/search/physics?searchtype=author&query=De+Gerone%2C+M">M. De Gerone</a>, <a href="/search/physics?searchtype=author&query=Francesconi%2C+M">M. Francesconi</a>, <a href="/search/physics?searchtype=author&query=Galli%2C+L">L. Galli</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">F. Gatti</a>, <a href="/search/physics?searchtype=author&query=Koga%2C+J">J. Koga</a>, <a href="/search/physics?searchtype=author&query=Nakao%2C+M">M. Nakao</a>, <a href="/search/physics?searchtype=author&query=Nishimura%2C+M">M. Nishimura</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">W. Ootani</a>, <a href="/search/physics?searchtype=author&query=Rossella%2C+M">M. Rossella</a>, <a href="/search/physics?searchtype=author&query=Uchiyama%2C+Y">Y. Uchiyama</a>, <a href="/search/physics?searchtype=author&query=Usami%2C+M">M. Usami</a>, <a href="/search/physics?searchtype=author&query=Yanai%2C+K">K. Yanai</a>, <a href="/search/physics?searchtype=author&query=Yoshida%2C+K">K. Yoshida</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1907.00911v2-abstract-short" style="display: inline;"> We have developed a new laser-based time calibration system for highly segmented scintillator counters like the MEG II pixelated Timing Counter (pTC), consisting of 512-centimeter scale scintillator counters read out by silicon photomultipliers (SiPMs). It is difficult to apply previous laser-based calibration methods for conventional meter-scale Time-Of-Flight detectors to the MEG II pTC from the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.00911v2-abstract-full').style.display = 'inline'; document.getElementById('1907.00911v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1907.00911v2-abstract-full" style="display: none;"> We have developed a new laser-based time calibration system for highly segmented scintillator counters like the MEG II pixelated Timing Counter (pTC), consisting of 512-centimeter scale scintillator counters read out by silicon photomultipliers (SiPMs). It is difficult to apply previous laser-based calibration methods for conventional meter-scale Time-Of-Flight detectors to the MEG II pTC from the implementation and the accuracy points of view. This paper presents a new laser-based time calibration system which can overcome such difficulties. A laser pulse is split into each scintillator counter via several optical components so that we can directly measure the time offset of each counter relative to the laser-emitted time. We carefully tested all the components and procedures prior to the actual operation. The laser system was installed into the pTC and thoroughly tested under the real experimental condition. The system showed good stability and being sensitive to any change of timing larger than ~10 ps. Moreover, it showed an uncertainty of 48 ps in the determination of the time offsets, which meets our requirements. The new method provides an example of the implementation of a precise timing alignment for the new type of detectors enabled by the advance of SiPM technology. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.00911v2-abstract-full').style.display = 'none'; document.getElementById('1907.00911v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 September, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 July, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 17 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuclear Inst. and Methods in Physics Research, A 947 (2019) 162672 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1905.06270">arXiv:1905.06270</a> <span> [<a href="https://arxiv.org/pdf/1905.06270">pdf</a>, <a href="https://arxiv.org/format/1905.06270">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> A Laser-based Time Calibration System for the MEG II Timing Counter </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Nakao%2C+M">M. Nakao</a>, <a href="/search/physics?searchtype=author&query=Boca%2C+G">G. Boca</a>, <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">P. W. Cattaneo</a>, <a href="/search/physics?searchtype=author&query=De+Gerone%2C+M">M. De Gerone</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">F. Gatti</a>, <a href="/search/physics?searchtype=author&query=Nishimura%2C+M">M. Nishimura</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">W. Ootani</a>, <a href="/search/physics?searchtype=author&query=Rossella%2C+M">M. Rossella</a>, <a href="/search/physics?searchtype=author&query=Uchiyama%2C+Y">Y. Uchiyama</a>, <a href="/search/physics?searchtype=author&query=Usami%2C+M">M. Usami</a>, <a href="/search/physics?searchtype=author&query=Yoshida%2C+K">K. Yoshida</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1905.06270v1-abstract-short" style="display: inline;"> We have developed a new laser-based time calibration system for the MEG II timing counter dedicated to timing measurement of positrons. The detector requires precise timing alignment between $\sim\,$500 scintillation counters. In this study, we present the calibration system which can directly measure the time offset of each counter relative to the laser-synchronized pulse. We thoroughly tested al… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.06270v1-abstract-full').style.display = 'inline'; document.getElementById('1905.06270v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1905.06270v1-abstract-full" style="display: none;"> We have developed a new laser-based time calibration system for the MEG II timing counter dedicated to timing measurement of positrons. The detector requires precise timing alignment between $\sim\,$500 scintillation counters. In this study, we present the calibration system which can directly measure the time offset of each counter relative to the laser-synchronized pulse. We thoroughly tested all the optical components and the uncertainty of this method is estimated to be 24 ps. In 2017, we installed the full system into the MEG II environment and performed a commissioning run. This method shows excellent stability and consistency with another method. The proposed system provides a precise timing alignment for SiPM-based timing detectors. It also has potential in areas such as TOF-PET. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.06270v1-abstract-full').style.display = 'none'; document.getElementById('1905.06270v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">3 pages, 3 figures, proceedings of the 2018 IEEE Nuclear Science Symposium and Medical Imaging Conference</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1809.08701">arXiv:1809.08701</a> <span> [<a href="https://arxiv.org/pdf/1809.08701">pdf</a>, <a href="https://arxiv.org/format/1809.08701">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2019.02.010">10.1016/j.nima.2019.02.010 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Large-Area MPPC with Enhanced VUV Sensitivity for Liquid Xenon Scintillation Detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ieki%2C+K">K. Ieki</a>, <a href="/search/physics?searchtype=author&query=Iwamoto%2C+T">T. Iwamoto</a>, <a href="/search/physics?searchtype=author&query=Kaneko%2C+D">D. Kaneko</a>, <a href="/search/physics?searchtype=author&query=Kobayashi%2C+S">S. Kobayashi</a>, <a href="/search/physics?searchtype=author&query=Matsuzawa%2C+N">N. Matsuzawa</a>, <a href="/search/physics?searchtype=author&query=Mori%2C+T">T. Mori</a>, <a href="/search/physics?searchtype=author&query=Ogawa%2C+S">S. Ogawa</a>, <a href="/search/physics?searchtype=author&query=Onda%2C+R">R. Onda</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">W. Ootani</a>, <a href="/search/physics?searchtype=author&query=Sawada%2C+R">R. Sawada</a>, <a href="/search/physics?searchtype=author&query=Sato%2C+K">K. Sato</a>, <a href="/search/physics?searchtype=author&query=Yamada%2C+R">R. Yamada</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1809.08701v2-abstract-short" style="display: inline;"> A large-area Multi-Pixel Photon Counter (MPPC) sensitive to vacuum ultra violet (VUV) light has been developed for the liquid xenon (LXe) scintillation detector of the MEG II experiment. The LXe detector is designed to detect the 52.8\,MeV photon from the lepton flavour violating decay $渭^+ \to \mathrm{e}^+ 纬$ and is based on $900\,\ell$ LXe with a highly granular scintillation readout by 4092 VUV… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1809.08701v2-abstract-full').style.display = 'inline'; document.getElementById('1809.08701v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1809.08701v2-abstract-full" style="display: none;"> A large-area Multi-Pixel Photon Counter (MPPC) sensitive to vacuum ultra violet (VUV) light has been developed for the liquid xenon (LXe) scintillation detector of the MEG II experiment. The LXe detector is designed to detect the 52.8\,MeV photon from the lepton flavour violating decay $渭^+ \to \mathrm{e}^+ 纬$ and is based on $900\,\ell$ LXe with a highly granular scintillation readout by 4092 VUV-MPPCs with an active area of $139\,\mathrm{mm}^2$ each, totalling $0.57\,\mathrm{m}^2$. The VUV-MPPC shows an excellent performance in LXe, which includes a high photon detection efficiency (PDE) up to 21\% for the LXe scintillation light in the VUV range, a high gain, a low probability of the optical cross-talk and the after-pulsing, a low dark count rate and a good single photoelectron resolution. The large active area of the VUV-MPPC is formed by connecting four independent small VUV-MPPC chips in series to avoid the increase of the sensor capacitance and thus, to have a short pulse-decay-time, which is crucial for high rate experiments. Performance tests of 4180 VUV-MPPCs produced for the LXe detector were also carried out at room temperature prior to the installation to the detector and all of them with only a few exceptions were found to work properly. The design and performance of the VUV-MPPC are described in detail as well as the results from the performance tests at room temperature. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1809.08701v2-abstract-full').style.display = 'none'; document.getElementById('1809.08701v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 February, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 September, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Revised version accepted for publication in Nucl. Instr. and Meth. A, 10 pages, 19 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1808.07279">arXiv:1808.07279</a> <span> [<a href="https://arxiv.org/pdf/1808.07279">pdf</a>, <a href="https://arxiv.org/format/1808.07279">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/978-981-13-1316-5_44">10.1007/978-981-13-1316-5_44 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Results from Pilot Run for MEG II Positron Timing Counter </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Nakao%2C+M">M. Nakao</a>, <a href="/search/physics?searchtype=author&query=De+Bari%2C+A">A. De Bari</a>, <a href="/search/physics?searchtype=author&query=Biasotti%2C+M">M. Biasotti</a>, <a href="/search/physics?searchtype=author&query=Boca%2C+G">G. Boca</a>, <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">P. W. Cattaneo</a>, <a href="/search/physics?searchtype=author&query=Francesconi%2C+M">M. Francesconi</a>, <a href="/search/physics?searchtype=author&query=De+Gerone%2C+M">M. De Gerone</a>, <a href="/search/physics?searchtype=author&query=Galli%2C+L">L. Galli</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">F. Gatti</a>, <a href="/search/physics?searchtype=author&query=Mtchedilishvili%2C+A">A. Mtchedilishvili</a>, <a href="/search/physics?searchtype=author&query=Nicol%2C+D">D. Nicol</a>, <a href="/search/physics?searchtype=author&query=Nishimura%2C+M">M. Nishimura</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">W. Ootani</a>, <a href="/search/physics?searchtype=author&query=Ritt%2C+S">S. Ritt</a>, <a href="/search/physics?searchtype=author&query=Rossella%2C+M">M. Rossella</a>, <a href="/search/physics?searchtype=author&query=Simonetta%2C+M">M. Simonetta</a>, <a href="/search/physics?searchtype=author&query=Uchiyama%2C+Y">Y. Uchiyama</a>, <a href="/search/physics?searchtype=author&query=Usami%2C+M">M. Usami</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1808.07279v1-abstract-short" style="display: inline;"> The MEG II experiment at Paul Scherrer Institut in Switzerland will search for the lepton flavour violating muon decay, $渭^+\to e^+纬$, with a sensitivity of $4\times10^{-14}$ improving the existing limit of an order of magnitude. In 2016, we finished the construction of the MEG II Timing Counter, the subdetector dedicated to the measurement of the positron emission time. The first one-fourth of it… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.07279v1-abstract-full').style.display = 'inline'; document.getElementById('1808.07279v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1808.07279v1-abstract-full" style="display: none;"> The MEG II experiment at Paul Scherrer Institut in Switzerland will search for the lepton flavour violating muon decay, $渭^+\to e^+纬$, with a sensitivity of $4\times10^{-14}$ improving the existing limit of an order of magnitude. In 2016, we finished the construction of the MEG II Timing Counter, the subdetector dedicated to the measurement of the positron emission time. The first one-fourth of it was installed in the experimental area and we performed a pilot run with the MEG~II beam of $7\times10^{7}渭^+/$s. The timing resolution reached the design value improving by a factor of two compared to MEG. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.07279v1-abstract-full').style.display = 'none'; document.getElementById('1808.07279v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 August, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, 2 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Springer Proc. Phys. 213 (2018) 237-241 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1801.04688">arXiv:1801.04688</a> <span> [<a href="https://arxiv.org/pdf/1801.04688">pdf</a>, <a href="https://arxiv.org/format/1801.04688">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epjc/s10052-018-5845-6">10.1140/epjc/s10052-018-5845-6 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The design of the MEG II experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Baldini%2C+A+M">A. M. Baldini</a>, <a href="/search/physics?searchtype=author&query=Baracchini%2C+E">E. Baracchini</a>, <a href="/search/physics?searchtype=author&query=Bemporad%2C+C">C. Bemporad</a>, <a href="/search/physics?searchtype=author&query=Berg%2C+F">F. Berg</a>, <a href="/search/physics?searchtype=author&query=Biasotti%2C+M">M. Biasotti</a>, <a href="/search/physics?searchtype=author&query=Boca%2C+G">G. Boca</a>, <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">P. W. Cattaneo</a>, <a href="/search/physics?searchtype=author&query=Cavoto%2C+G">G. Cavoto</a>, <a href="/search/physics?searchtype=author&query=Cei%2C+F">F. Cei</a>, <a href="/search/physics?searchtype=author&query=Chiappini%2C+M">M. Chiappini</a>, <a href="/search/physics?searchtype=author&query=Chiarello%2C+G">G. Chiarello</a>, <a href="/search/physics?searchtype=author&query=Chiri%2C+C">C. Chiri</a>, <a href="/search/physics?searchtype=author&query=Cocciolo%2C+G">G. Cocciolo</a>, <a href="/search/physics?searchtype=author&query=Corvaglia%2C+A">A. Corvaglia</a>, <a href="/search/physics?searchtype=author&query=de+Bari%2C+A">A. de Bari</a>, <a href="/search/physics?searchtype=author&query=De+Gerone%2C+M">M. De Gerone</a>, <a href="/search/physics?searchtype=author&query=D%27Onofrio%2C+A">A. D'Onofrio</a>, <a href="/search/physics?searchtype=author&query=Francesconi%2C+M">M. Francesconi</a>, <a href="/search/physics?searchtype=author&query=Fujii%2C+Y">Y. Fujii</a>, <a href="/search/physics?searchtype=author&query=Galli%2C+L">L. Galli</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">F. Gatti</a>, <a href="/search/physics?searchtype=author&query=Grancagnolo%2C+F">F. Grancagnolo</a>, <a href="/search/physics?searchtype=author&query=Grassi%2C+M">M. Grassi</a>, <a href="/search/physics?searchtype=author&query=Grigoriev%2C+D+N">D. N. Grigoriev</a>, <a href="/search/physics?searchtype=author&query=Hildebrandt%2C+M">M. Hildebrandt</a> , et al. (55 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1801.04688v1-abstract-short" style="display: inline;"> The MEG experiment, designed to search for the mu+->e+ gamma decay at a 10^-13 sensitivity level, completed data taking in 2013. In order to increase the sensitivity reach of the experiment by an order of magnitude to the level of 6 x 10-14 for the branching ratio, a total upgrade, involving substantial changes to the experiment, has been undertaken, known as MEG II. We present both the motivation… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1801.04688v1-abstract-full').style.display = 'inline'; document.getElementById('1801.04688v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1801.04688v1-abstract-full" style="display: none;"> The MEG experiment, designed to search for the mu+->e+ gamma decay at a 10^-13 sensitivity level, completed data taking in 2013. In order to increase the sensitivity reach of the experiment by an order of magnitude to the level of 6 x 10-14 for the branching ratio, a total upgrade, involving substantial changes to the experiment, has been undertaken, known as MEG II. We present both the motivation for the upgrade and a detailed overview of the design of the experiment and of the expected detector performance. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1801.04688v1-abstract-full').style.display = 'none'; document.getElementById('1801.04688v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 January, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">61 pages and 97 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C 78 (380) (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1707.07126">arXiv:1707.07126</a> <span> [<a href="https://arxiv.org/pdf/1707.07126">pdf</a>, <a href="https://arxiv.org/ps/1707.07126">ps</a>, <a href="https://arxiv.org/format/1707.07126">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Construction and Response of a Highly Granular Scintillator-based Electromagnetic Calorimeter </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=CALICE+collaboration"> CALICE collaboration</a>, <a href="/search/physics?searchtype=author&query=Repond%2C+J">J. Repond</a>, <a href="/search/physics?searchtype=author&query=Xia%2C+L">L. Xia</a>, <a href="/search/physics?searchtype=author&query=Eigen%2C+G">G. Eigen</a>, <a href="/search/physics?searchtype=author&query=Price%2C+T">T. Price</a>, <a href="/search/physics?searchtype=author&query=Watson%2C+N+K">N. K. Watson</a>, <a href="/search/physics?searchtype=author&query=Winter%2C+A">A. Winter</a>, <a href="/search/physics?searchtype=author&query=Thomson%2C+M+A">M. A. Thomson</a>, <a href="/search/physics?searchtype=author&query=Blazey%2C+G+C">G. C. Blazey</a>, <a href="/search/physics?searchtype=author&query=Dyshkant%2C+A">A. Dyshkant</a>, <a href="/search/physics?searchtype=author&query=Francis%2C+K">K. Francis</a>, <a href="/search/physics?searchtype=author&query=Zutshi%2C+V">V. Zutshi</a>, <a href="/search/physics?searchtype=author&query=Gadow%2C+K">K. Gadow</a>, <a href="/search/physics?searchtype=author&query=G%C3%B6ttlicher%2C+P">P. G枚ttlicher</a>, <a href="/search/physics?searchtype=author&query=Hartbrich%2C+O">O. Hartbrich</a>, <a href="/search/physics?searchtype=author&query=Krivan%2C+F">F. Krivan</a>, <a href="/search/physics?searchtype=author&query=Kr%C3%BCger%2C+K">K. Kr眉ger</a>, <a href="/search/physics?searchtype=author&query=Lu%2C+S">S. Lu</a>, <a href="/search/physics?searchtype=author&query=Lutz%2C+B">B. Lutz</a>, <a href="/search/physics?searchtype=author&query=Reinecke%2C+M">M. Reinecke</a>, <a href="/search/physics?searchtype=author&query=Sefkow%2C+F">F. Sefkow</a>, <a href="/search/physics?searchtype=author&query=Sudo%2C+Y">Y. Sudo</a>, <a href="/search/physics?searchtype=author&query=Tran%2C+H+L">H. L. Tran</a>, <a href="/search/physics?searchtype=author&query=Kaplan%2C+A">A. Kaplan</a>, <a href="/search/physics?searchtype=author&query=Schultz-Coulon%2C+H+-">H. -Ch. Schultz-Coulon</a> , et al. (57 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1707.07126v3-abstract-short" style="display: inline;"> A highly granular electromagnetic calorimeter with scintillator strip readout is being developed for future lepton collider experiments. A prototype of 21.5 $X_0$ depth and $180 \times 180 $mm$^2$ transverse dimensions was constructed, consisting of 2160 individually read out $10 \times 45 \times 3$ mm$^3$ scintillator strips. This prototype was tested using electrons of 2--32 GeV at the Fermilab… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1707.07126v3-abstract-full').style.display = 'inline'; document.getElementById('1707.07126v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1707.07126v3-abstract-full" style="display: none;"> A highly granular electromagnetic calorimeter with scintillator strip readout is being developed for future lepton collider experiments. A prototype of 21.5 $X_0$ depth and $180 \times 180 $mm$^2$ transverse dimensions was constructed, consisting of 2160 individually read out $10 \times 45 \times 3$ mm$^3$ scintillator strips. This prototype was tested using electrons of 2--32 GeV at the Fermilab Test Beam Facility in 2009. Deviations from linear energy response were less than 1.1\%, and the intrinsic energy resolution was determined to be $(12.5 \pm 0.1 (\mathrm{stat.}) \pm0.4 (\mathrm{syst.}))\%/\sqrt{E[\mathrm{GeV}]}\oplus (1.2 \pm 0.1(\mathrm{stat.})^{+0.6}_{-0.7}(\mathrm{syst.}))\%$, where the uncertainties correspond to statistical and systematic sources, respectively. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1707.07126v3-abstract-full').style.display = 'none'; document.getElementById('1707.07126v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 February, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 July, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">This article is published in Nuclear Inst. and Methods in Physics Research, A 887 (2018) 150-168</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuclear Inst. and Methods in Physics Research, A 887 (2018) 150-168 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1603.01652">arXiv:1603.01652</a> <span> [<a href="https://arxiv.org/pdf/1603.01652">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/11/05/P05008">10.1088/1748-0221/11/05/P05008 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> DHCAL with Minimal Absorber: Measurements with Positrons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=The+CALICE+Collaboration"> The CALICE Collaboration</a>, <a href="/search/physics?searchtype=author&query=Freund%2C+B">B. Freund</a>, <a href="/search/physics?searchtype=author&query=Neub%C3%BCser%2C+C">C. Neub眉ser</a>, <a href="/search/physics?searchtype=author&query=Repond%2C+J">J. Repond</a>, <a href="/search/physics?searchtype=author&query=Schlereth%2C+J">J. Schlereth</a>, <a href="/search/physics?searchtype=author&query=Xia%2C+L">L. Xia</a>, <a href="/search/physics?searchtype=author&query=Dotti%2C+A">A. Dotti</a>, <a href="/search/physics?searchtype=author&query=Grefe%2C+C">C. Grefe</a>, <a href="/search/physics?searchtype=author&query=Ivantchenko%2C+V">V. Ivantchenko</a>, <a href="/search/physics?searchtype=author&query=Antequera%2C+J+B">J. Berenguer Antequera</a>, <a href="/search/physics?searchtype=author&query=Alamillo%2C+E+C">E. Calvo Alamillo</a>, <a href="/search/physics?searchtype=author&query=Fouz%2C+M+-">M. -C. Fouz</a>, <a href="/search/physics?searchtype=author&query=Marin%2C+J">J. Marin</a>, <a href="/search/physics?searchtype=author&query=Puerta-Pelayo%2C+J">J. Puerta-Pelayo</a>, <a href="/search/physics?searchtype=author&query=Verdugo%2C+A">A. Verdugo</a>, <a href="/search/physics?searchtype=author&query=Brianne%2C+E">E. Brianne</a>, <a href="/search/physics?searchtype=author&query=Ebrahimi%2C+A">A. Ebrahimi</a>, <a href="/search/physics?searchtype=author&query=Gadow%2C+K">K. Gadow</a>, <a href="/search/physics?searchtype=author&query=G%C3%B6ttlicher%2C+P">P. G枚ttlicher</a>, <a href="/search/physics?searchtype=author&query=G%C3%BCnter%2C+C">C. G眉nter</a>, <a href="/search/physics?searchtype=author&query=Hartbrich%2C+O">O. Hartbrich</a>, <a href="/search/physics?searchtype=author&query=Hermberg%2C+B">B. Hermberg</a>, <a href="/search/physics?searchtype=author&query=Irles%2C+A">A. Irles</a>, <a href="/search/physics?searchtype=author&query=Krivan%2C+F">F. Krivan</a>, <a href="/search/physics?searchtype=author&query=Kr%C3%BCger%2C+K">K. Kr眉ger</a> , et al. (78 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1603.01652v1-abstract-short" style="display: inline;"> In special tests, the active layers of the CALICE Digital Hadron Calorimeter prototype, the DHCAL, were exposed to low energy particle beams, without being interleaved by absorber plates. The thickness of each layer corresponded approximately to 0.29 radiation lengths or 0.034 nuclear interaction lengths, defined mostly by the copper and steel skins of the detector cassettes. This paper reports on… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1603.01652v1-abstract-full').style.display = 'inline'; document.getElementById('1603.01652v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1603.01652v1-abstract-full" style="display: none;"> In special tests, the active layers of the CALICE Digital Hadron Calorimeter prototype, the DHCAL, were exposed to low energy particle beams, without being interleaved by absorber plates. The thickness of each layer corresponded approximately to 0.29 radiation lengths or 0.034 nuclear interaction lengths, defined mostly by the copper and steel skins of the detector cassettes. This paper reports on measurements performed with this device in the Fermilab test beam with positrons in the energy range of 1 to 10 GeV. The measurements are compared to simulations based on GEANT4 and a standalone program to emulate the detailed response of the active elements. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1603.01652v1-abstract-full').style.display = 'none'; document.getElementById('1603.01652v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 March, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2016. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1602.08578">arXiv:1602.08578</a> <span> [<a href="https://arxiv.org/pdf/1602.08578">pdf</a>, <a href="https://arxiv.org/format/1602.08578">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/11/06/P06013">10.1088/1748-0221/11/06/P06013 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Hadron shower decomposition in the highly granular CALICE analogue hadron calorimeter </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=The+CALICE+Collaboration"> The CALICE Collaboration</a>, <a href="/search/physics?searchtype=author&query=Eigen%2C+G">G. Eigen</a>, <a href="/search/physics?searchtype=author&query=Price%2C+T">T. Price</a>, <a href="/search/physics?searchtype=author&query=Watson%2C+N+K">N. K. Watson</a>, <a href="/search/physics?searchtype=author&query=Marshall%2C+J+S">J. S. Marshall</a>, <a href="/search/physics?searchtype=author&query=Thomson%2C+M+A">M. A. Thomson</a>, <a href="/search/physics?searchtype=author&query=Ward%2C+D+R">D. R. Ward</a>, <a href="/search/physics?searchtype=author&query=Benchekroun%2C+D">D. Benchekroun</a>, <a href="/search/physics?searchtype=author&query=Hoummada%2C+A">A. Hoummada</a>, <a href="/search/physics?searchtype=author&query=Khoulaki%2C+Y">Y. Khoulaki</a>, <a href="/search/physics?searchtype=author&query=Apostolakis%2C+J">J. Apostolakis</a>, <a href="/search/physics?searchtype=author&query=Dotti%2C+A">A. Dotti</a>, <a href="/search/physics?searchtype=author&query=Folger%2C+G">G. Folger</a>, <a href="/search/physics?searchtype=author&query=Ivantchenko%2C+V">V. Ivantchenko</a>, <a href="/search/physics?searchtype=author&query=Ribon%2C+A">A. Ribon</a>, <a href="/search/physics?searchtype=author&query=Uzhinskiy%2C+V">V. Uzhinskiy</a>, <a href="/search/physics?searchtype=author&query=Hostachy%2C+J+-">J. -Y. Hostachy</a>, <a href="/search/physics?searchtype=author&query=Morin%2C+L">L. Morin</a>, <a href="/search/physics?searchtype=author&query=Brianne%2C+E">E. Brianne</a>, <a href="/search/physics?searchtype=author&query=Ebrahimi%2C+A">A. Ebrahimi</a>, <a href="/search/physics?searchtype=author&query=Gadow%2C+K">K. Gadow</a>, <a href="/search/physics?searchtype=author&query=G%C3%B6ttlicher%2C+P">P. G枚ttlicher</a>, <a href="/search/physics?searchtype=author&query=G%C3%BCnter%2C+C">C. G眉nter</a>, <a href="/search/physics?searchtype=author&query=Hartbrich%2C+O">O. Hartbrich</a>, <a href="/search/physics?searchtype=author&query=Hermberg%2C+B">B. Hermberg</a> , et al. (135 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1602.08578v2-abstract-short" style="display: inline;"> The spatial development of hadronic showers in the CALICE scintillator-steel analogue hadron calorimeter is studied using test beam data collected at CERN and FNAL for single positive pions and protons with initial momenta in the range from 10 to 80 GeV/c. Both longitudinal and radial development of hadron showers are parametrised with two-component functions. The parametrisation is fit to test be… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1602.08578v2-abstract-full').style.display = 'inline'; document.getElementById('1602.08578v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1602.08578v2-abstract-full" style="display: none;"> The spatial development of hadronic showers in the CALICE scintillator-steel analogue hadron calorimeter is studied using test beam data collected at CERN and FNAL for single positive pions and protons with initial momenta in the range from 10 to 80 GeV/c. Both longitudinal and radial development of hadron showers are parametrised with two-component functions. The parametrisation is fit to test beam data and simulations using the QGSP_BERT and FTFP_BERT physics lists from Geant4 version 9.6. The parameters extracted from data and simulated samples are compared for the two types of hadrons. The response to pions and the ratio of the non-electromagnetic to the electromagnetic calorimeter response, h/e, are estimated using the extrapolation and decomposition of the longitudinal profiles. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1602.08578v2-abstract-full').style.display = 'none'; document.getElementById('1602.08578v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 March, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 February, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">38 pages, 19 figures, 5 tables; author list changed; submitted to JINST</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1511.03891">arXiv:1511.03891</a> <span> [<a href="https://arxiv.org/pdf/1511.03891">pdf</a>, <a href="https://arxiv.org/format/1511.03891">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2016.05.038">10.1016/j.nima.2016.05.038 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Time resolution of time-of-flight detector based on multiple scintillation counters readout by SiPMs </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">P. W. Cattaneo</a>, <a href="/search/physics?searchtype=author&query=De+Gerone%2C+M">M. De Gerone</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">F. Gatti</a>, <a href="/search/physics?searchtype=author&query=Nishimura%2C+M">M. Nishimura</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">W. Ootani</a>, <a href="/search/physics?searchtype=author&query=Rossella%2C+M">M. Rossella</a>, <a href="/search/physics?searchtype=author&query=Shirabe%2C+S">S. Shirabe</a>, <a href="/search/physics?searchtype=author&query=Uchiyama%2C+Y">Y. Uchiyama</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1511.03891v2-abstract-short" style="display: inline;"> A new timing detector measuring ~50 MeV/c positrons is under development for the MEG II experiment, aiming at a time resolution $蟽_t \sim 30~\mathrm{ps}$. The resolution is expected to be achieved by measuring each positron time with multiple counters made of plastic scintillator readout by silicon photomultipliers (SiPMs). The purpose of this work is to demonstrate the time resolution for ~50 MeV… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1511.03891v2-abstract-full').style.display = 'inline'; document.getElementById('1511.03891v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1511.03891v2-abstract-full" style="display: none;"> A new timing detector measuring ~50 MeV/c positrons is under development for the MEG II experiment, aiming at a time resolution $蟽_t \sim 30~\mathrm{ps}$. The resolution is expected to be achieved by measuring each positron time with multiple counters made of plastic scintillator readout by silicon photomultipliers (SiPMs). The purpose of this work is to demonstrate the time resolution for ~50 MeV/c positrons using prototype counters. Counters with dimensions of $90\times 40\times 5~\mathrm{mm}^3$ readout by six SiPMs (three on each $40\times 5~\mathrm{mm}^2$ plane) were built with SiPMs from Hamamatsu Photonics and AdvanSiD and tested in a positron beam at the DA$桅$NE Beam Test Facility. The time resolution was found to improve nearly as the square root of the number of counter hits. A time resolution $蟽_t=26.2\pm1.3~\mathrm{ps}$ was obtained with eight counters with Hamamatsu SiPMs. These results suggest that the design resolution is achievable in the MEG II experiment. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1511.03891v2-abstract-full').style.display = 'none'; document.getElementById('1511.03891v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 May, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 November, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 18 figures. Published in NIM A</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl. Instrm. Methods A 828 (2016) 191-200 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1510.04743">arXiv:1510.04743</a> <span> [<a href="https://arxiv.org/pdf/1510.04743">pdf</a>, <a href="https://arxiv.org/ps/1510.04743">ps</a>, <a href="https://arxiv.org/format/1510.04743">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epjc/s10052-016-4047-3">10.1140/epjc/s10052-016-4047-3 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Muon polarization in the MEG experiment: predictions and measurements </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Baldini%2C+A+M">A. M. Baldini</a>, <a href="/search/physics?searchtype=author&query=Bao%2C+Y">Y. Bao</a>, <a href="/search/physics?searchtype=author&query=Baracchini%2C+E">E. Baracchini</a>, <a href="/search/physics?searchtype=author&query=Bemporad%2C+C">C. Bemporad</a>, <a href="/search/physics?searchtype=author&query=Berg%2C+F">F. Berg</a>, <a href="/search/physics?searchtype=author&query=Biasotti%2C+M">M. Biasotti</a>, <a href="/search/physics?searchtype=author&query=Boca%2C+G">G. Boca</a>, <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">P. W. Cattaneo</a>, <a href="/search/physics?searchtype=author&query=Cavoto%2C+G">G. Cavoto</a>, <a href="/search/physics?searchtype=author&query=Cei%2C+F">F. Cei</a>, <a href="/search/physics?searchtype=author&query=Chiarello%2C+G">G. Chiarello</a>, <a href="/search/physics?searchtype=author&query=Chiri%2C+C">C. Chiri</a>, <a href="/search/physics?searchtype=author&query=De+Bari%2C+A">A. De Bari</a>, <a href="/search/physics?searchtype=author&query=De+Gerone%2C+M">M. De Gerone</a>, <a href="/search/physics?searchtype=author&query=D%C3%93nofrio%2C+A">A. D脫nofrio</a>, <a href="/search/physics?searchtype=author&query=Dussoni%2C+S">S. Dussoni</a>, <a href="/search/physics?searchtype=author&query=Fujii%2C+Y">Y. Fujii</a>, <a href="/search/physics?searchtype=author&query=Galli%2C+L">L. Galli</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">F. Gatti</a>, <a href="/search/physics?searchtype=author&query=Grancagnolo%2C+F">F. Grancagnolo</a>, <a href="/search/physics?searchtype=author&query=Grassi%2C+M">M. Grassi</a>, <a href="/search/physics?searchtype=author&query=Graziosi%2C+A">A. Graziosi</a>, <a href="/search/physics?searchtype=author&query=Grigoriev%2C+D+N">D. N. Grigoriev</a>, <a href="/search/physics?searchtype=author&query=Haruyama%2C+T">T. Haruyama</a>, <a href="/search/physics?searchtype=author&query=Hildebrandt%2C+M">M. Hildebrandt</a> , et al. (45 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1510.04743v2-abstract-short" style="display: inline;"> The MEG experiment makes use of one of the world's most intense low energy muon beams, in order to search for the lepton flavour violating process $渭^{+} \rightarrow {\rm e}^{+} 纬$. We determined the residual beam polarization at the thin stopping target, by measuring the asymmetry of the angular distribution of Michel decay positrons as a function of energy. The initial muon beam polarization at… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1510.04743v2-abstract-full').style.display = 'inline'; document.getElementById('1510.04743v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1510.04743v2-abstract-full" style="display: none;"> The MEG experiment makes use of one of the world's most intense low energy muon beams, in order to search for the lepton flavour violating process $渭^{+} \rightarrow {\rm e}^{+} 纬$. We determined the residual beam polarization at the thin stopping target, by measuring the asymmetry of the angular distribution of Michel decay positrons as a function of energy. The initial muon beam polarization at the production is predicted to be $P_渭 = -1$ by the Standard Model (SM) with massless neutrinos. We estimated our residual muon polarization to be $P_渭 = -0.85 \pm 0.03 ~ {\rm (stat)} ~ { }^{+ 0.04}_{-0.05} ~ {\rm (syst)}$ at the stopping target, which is consistent with the SM predictions when the depolarizing effects occurring during the muon production, propagation and moderation in the target are taken into account. The knowledge of beam polarization is of fundamental importance in order to model the background of our ${\megsign}$ search induced by the muon radiative decay: $渭^{+} \rightarrow {\rm e}^{+} \bar谓_渭谓_{\rm e} 纬$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1510.04743v2-abstract-full').style.display = 'none'; document.getElementById('1510.04743v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 April, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 October, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C (2016) 76:223 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1509.00617">arXiv:1509.00617</a> <span> [<a href="https://arxiv.org/pdf/1509.00617">pdf</a>, <a href="https://arxiv.org/format/1509.00617">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/10/12/P12006">10.1088/1748-0221/10/12/P12006 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Shower development of particles with momenta from 15 GeV to 150 GeV in the CALICE scintillator-tungsten hadronic calorimeter </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=The+CALICE+collaboration"> The CALICE collaboration</a>, <a href="/search/physics?searchtype=author&query=Chefdeville%2C+M">M. Chefdeville</a>, <a href="/search/physics?searchtype=author&query=Karyotakis%2C+Y">Y. Karyotakis</a>, <a href="/search/physics?searchtype=author&query=Repond%2C+J">J. Repond</a>, <a href="/search/physics?searchtype=author&query=Schlereth%2C+J">J. Schlereth</a>, <a href="/search/physics?searchtype=author&query=Xia%2C+L">L. Xia</a>, <a href="/search/physics?searchtype=author&query=Eigen%2C+G">G. Eigen</a>, <a href="/search/physics?searchtype=author&query=Marshall%2C+J+S">J. S. Marshall</a>, <a href="/search/physics?searchtype=author&query=Thomson%2C+M+A">M. A. Thomson</a>, <a href="/search/physics?searchtype=author&query=Ward%2C+D+R">D. R. Ward</a>, <a href="/search/physics?searchtype=author&query=Tehrani%2C+N+A">N. Alipour Tehrani</a>, <a href="/search/physics?searchtype=author&query=Apostolakis%2C+J">J. Apostolakis</a>, <a href="/search/physics?searchtype=author&query=Dannheim%2C+D">D. Dannheim</a>, <a href="/search/physics?searchtype=author&query=Elsener%2C+K">K. Elsener</a>, <a href="/search/physics?searchtype=author&query=Folger%2C+G">G. Folger</a>, <a href="/search/physics?searchtype=author&query=Grefe%2C+C">C. Grefe</a>, <a href="/search/physics?searchtype=author&query=Ivantchenko%2C+V">V. Ivantchenko</a>, <a href="/search/physics?searchtype=author&query=Killenberg%2C+M">M. Killenberg</a>, <a href="/search/physics?searchtype=author&query=Klempt%2C+W">W. Klempt</a>, <a href="/search/physics?searchtype=author&query=van+der+Kraaij%2C+E">E. van der Kraaij</a>, <a href="/search/physics?searchtype=author&query=Linssen%2C+L">L. Linssen</a>, <a href="/search/physics?searchtype=author&query=Lucaci-Timoce%2C+A+-">A. -I. Lucaci-Timoce</a>, <a href="/search/physics?searchtype=author&query=M%C3%BCnnich%2C+A">A. M眉nnich</a>, <a href="/search/physics?searchtype=author&query=Poss%2C+S">S. Poss</a>, <a href="/search/physics?searchtype=author&query=Ribon%2C+A">A. Ribon</a> , et al. (158 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1509.00617v2-abstract-short" style="display: inline;"> We present a study of showers initiated by electrons, pions, kaons, and protons with momenta from 15 GeV to 150 GeV in the highly granular CALICE scintillator-tungsten analogue hadronic calorimeter. The data were recorded at the CERN Super Proton Synchrotron in 2011. The analysis includes measurements of the calorimeter response to each particle type as well as measurements of the energy resolutio… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1509.00617v2-abstract-full').style.display = 'inline'; document.getElementById('1509.00617v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1509.00617v2-abstract-full" style="display: none;"> We present a study of showers initiated by electrons, pions, kaons, and protons with momenta from 15 GeV to 150 GeV in the highly granular CALICE scintillator-tungsten analogue hadronic calorimeter. The data were recorded at the CERN Super Proton Synchrotron in 2011. The analysis includes measurements of the calorimeter response to each particle type as well as measurements of the energy resolution and studies of the longitudinal and radial shower development for selected particles. The results are compared to Geant4 simulations (version 9.6.p02). In the study of the energy resolution we include previously published data with beam momenta from 1 GeV to 10 GeV recorded at the CERN Proton Synchrotron in 2010. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1509.00617v2-abstract-full').style.display = 'none'; document.getElementById('1509.00617v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 December, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 September, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">35 pages, 21 figures, 8 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> 2015 JINST 10 P12006 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1402.1404">arXiv:1402.1404</a> <span> [<a href="https://arxiv.org/pdf/1402.1404">pdf</a>, <a href="https://arxiv.org/format/1402.1404">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1109/TNS.2014.2347576">10.1109/TNS.2014.2347576 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Development of High Precision Timing Counter Based on Plastic Scintillator with SiPM Readout </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">Paolo W. Cattaneo</a>, <a href="/search/physics?searchtype=author&query=De+Gerone%2C+M">Matteo De Gerone</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">Flavio Gatti</a>, <a href="/search/physics?searchtype=author&query=Nishimura%2C+M">Miki Nishimura</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">Wataru Ootani</a>, <a href="/search/physics?searchtype=author&query=Rossella%2C+M">Massimo Rossella</a>, <a href="/search/physics?searchtype=author&query=Uchiyama%2C+Y">Yusuke Uchiyama</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1402.1404v2-abstract-short" style="display: inline;"> High-time-resolution counters based on plastic scintillator with silicon photomultiplier (SiPM) readout have been developed for applications to high energy physics experiments for which relatively large-sized counters are required. We have studied counter sizes up to $120\times40\times5$ mm^3 with series connection of multiple SiPMs to increase the sensitive area and thus achieve better time resol… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1402.1404v2-abstract-full').style.display = 'inline'; document.getElementById('1402.1404v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1402.1404v2-abstract-full" style="display: none;"> High-time-resolution counters based on plastic scintillator with silicon photomultiplier (SiPM) readout have been developed for applications to high energy physics experiments for which relatively large-sized counters are required. We have studied counter sizes up to $120\times40\times5$ mm^3 with series connection of multiple SiPMs to increase the sensitive area and thus achieve better time resolution. A readout scheme with analog shaping and digital waveform analysis is optimized to achieve the highest time resolution. The timing performance is measured using electrons from a Sr-90 radioactive source, comparing different scintillators, counter dimensions, and types of near-ultraviolet sensitive SiPMs. As a result, a resolution of $蟽=42 \pm 2$ ps at 1 MeV energy deposition is obtained for counter size $60\times 30 \times 5$ mm^3 with three SiPMs ($3\times3$ mm^2 each) at each end of the scintillator. The time resolution improves with the number of photons detected by the SiPMs. The SiPMs from Hamamatsu Photonics give the best time resolution because of their high photon detection efficiency in the near-ultraviolet region. Further improvement is possible by increasing the number of SiPMs attached to the scintillator. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1402.1404v2-abstract-full').style.display = 'none'; document.getElementById('1402.1404v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 August, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 February, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 17 figures, accepted by IEEE Trans. Nucl. Sci</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> IEEE Trans. Nucl. Sci. 61, 2657-2666 (2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1312.3217">arXiv:1312.3217</a> <span> [<a href="https://arxiv.org/pdf/1312.3217">pdf</a>, <a href="https://arxiv.org/format/1312.3217">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epjc/s10052-016-3947-6">10.1140/epjc/s10052-016-3947-6 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the radiative decay of polarized muons in the MEG experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=MEG+Collaboration"> MEG Collaboration</a>, <a href="/search/physics?searchtype=author&query=Baldini%2C+A+M">A. M. Baldini</a>, <a href="/search/physics?searchtype=author&query=Bao%2C+Y">Y. Bao</a>, <a href="/search/physics?searchtype=author&query=Baracchini%2C+E">E. Baracchini</a>, <a href="/search/physics?searchtype=author&query=Bemporad%2C+C">C. Bemporad</a>, <a href="/search/physics?searchtype=author&query=Berg%2C+F">F. Berg</a>, <a href="/search/physics?searchtype=author&query=Biasotti%2C+M">M. Biasotti</a>, <a href="/search/physics?searchtype=author&query=Boca%2C+G">G. Boca</a>, <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">P. W. Cattaneo</a>, <a href="/search/physics?searchtype=author&query=Cavoto%2C+G">G. Cavoto</a>, <a href="/search/physics?searchtype=author&query=Cei%2C+F">F. Cei</a>, <a href="/search/physics?searchtype=author&query=Chiarello%2C+G">G. Chiarello</a>, <a href="/search/physics?searchtype=author&query=Chiri%2C+C">C. Chiri</a>, <a href="/search/physics?searchtype=author&query=de+Bari%2C+A">A. de Bari</a>, <a href="/search/physics?searchtype=author&query=De+Gerone%2C+M">M. De Gerone</a>, <a href="/search/physics?searchtype=author&query=D%27Onofrio%2C+A">A. D'Onofrio</a>, <a href="/search/physics?searchtype=author&query=Dussoni%2C+S">S. Dussoni</a>, <a href="/search/physics?searchtype=author&query=Fujii%2C+Y">Y. Fujii</a>, <a href="/search/physics?searchtype=author&query=Galli%2C+L">L. Galli</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">F. Gatti</a>, <a href="/search/physics?searchtype=author&query=Grancagnolo%2C+F">F. Grancagnolo</a>, <a href="/search/physics?searchtype=author&query=Grassi%2C+M">M. Grassi</a>, <a href="/search/physics?searchtype=author&query=Graziosi%2C+A">A. Graziosi</a>, <a href="/search/physics?searchtype=author&query=Grigoriev%2C+D+N">D. N. Grigoriev</a>, <a href="/search/physics?searchtype=author&query=Haruyama%2C+T">T. Haruyama</a> , et al. (46 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1312.3217v3-abstract-short" style="display: inline;"> We studied the radiative muon decay $渭^+ \to e^+谓\bar谓纬$ by using for the first time an almost fully polarized muon source. We identified a large sample (~13000) of these decays in a total sample of 1.8x10^14 positive muon decays collected in the MEG experiment in the years 2009--2010 and measured the branching ratio B($渭^+ \to e^+谓\bar谓纬$) = (6.03+-0.14(stat.)+-0.53(sys.))x10^-8 for E_e > 45 MeV… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1312.3217v3-abstract-full').style.display = 'inline'; document.getElementById('1312.3217v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1312.3217v3-abstract-full" style="display: none;"> We studied the radiative muon decay $渭^+ \to e^+谓\bar谓纬$ by using for the first time an almost fully polarized muon source. We identified a large sample (~13000) of these decays in a total sample of 1.8x10^14 positive muon decays collected in the MEG experiment in the years 2009--2010 and measured the branching ratio B($渭^+ \to e^+谓\bar谓纬$) = (6.03+-0.14(stat.)+-0.53(sys.))x10^-8 for E_e > 45 MeV and E_纬 > 40 MeV, consistent with the Standard Model prediction. The precise measurement of this decay mode provides a basic tool for the timing calibration, a normalization channel, and a strong quality check of the complete MEG experiment in the search for $渭^+ \to e^+纬$ process. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1312.3217v3-abstract-full').style.display = 'none'; document.getElementById('1312.3217v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 March, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 December, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 7 figures. Added an introduction to NLO calculation which was recently calculated. Published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C (2016) 76:108 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1312.0871">arXiv:1312.0871</a> <span> [<a href="https://arxiv.org/pdf/1312.0871">pdf</a>, <a href="https://arxiv.org/format/1312.0871">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/9/02/C02035">10.1088/1748-0221/9/02/C02035 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Design and test of an extremely high resolution Timing Counter for the MEG II experiment: preliminary results </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=De+Gerone%2C+M">M. De Gerone</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">F. Gatti</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">W. Ootani</a>, <a href="/search/physics?searchtype=author&query=Uchiyama%2C+Y">Y. Uchiyama</a>, <a href="/search/physics?searchtype=author&query=Nishimura%2C+M">M. Nishimura</a>, <a href="/search/physics?searchtype=author&query=Shirabe%2C+S">S. Shirabe</a>, <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">P. W. Cattaneo</a>, <a href="/search/physics?searchtype=author&query=Rossella%2C+M">M. Rossella</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1312.0871v2-abstract-short" style="display: inline;"> The design and tests of Timing Counter elements for the upgrade of the MEG experiment, MEG II,is presented. The detector is based on several small plates of scintillator with a Silicon PhotoMultipliers dual-side readout. The optimisation of the single counter elements (SiPMs, scintillators, geometry) is described. Moreover, the results obtained with a first prototype tested at the Beam Test Facili… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1312.0871v2-abstract-full').style.display = 'inline'; document.getElementById('1312.0871v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1312.0871v2-abstract-full" style="display: none;"> The design and tests of Timing Counter elements for the upgrade of the MEG experiment, MEG II,is presented. The detector is based on several small plates of scintillator with a Silicon PhotoMultipliers dual-side readout. The optimisation of the single counter elements (SiPMs, scintillators, geometry) is described. Moreover, the results obtained with a first prototype tested at the Beam Test Facility (BTF) of the INFN Laboratori Nazionali di Frascati (LNF) are presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1312.0871v2-abstract-full').style.display = 'none'; document.getElementById('1312.0871v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 January, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 3 December, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 7 figures. Presented at the 13th Topical Seminar on Innovative Particle and Radiation Detectors (IPRD13) 7-10 October 2013 Siena, Italy</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1303.2348">arXiv:1303.2348</a> <span> [<a href="https://arxiv.org/pdf/1303.2348">pdf</a>, <a href="https://arxiv.org/ps/1303.2348">ps</a>, <a href="https://arxiv.org/format/1303.2348">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epjc/s10052-013-2365-2">10.1140/epjc/s10052-013-2365-2 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The MEG detector for $渭+\to e+纬$ decay search </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Adam%2C+J">J. Adam</a>, <a href="/search/physics?searchtype=author&query=Bai%2C+X">X. Bai</a>, <a href="/search/physics?searchtype=author&query=Baldini%2C+A+M">A. M. Baldini</a>, <a href="/search/physics?searchtype=author&query=Baracchini%2C+E">E. Baracchini</a>, <a href="/search/physics?searchtype=author&query=Bemporad%2C+C">C. Bemporad</a>, <a href="/search/physics?searchtype=author&query=Boca%2C+G">G. Boca</a>, <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">P. W. Cattaneo</a>, <a href="/search/physics?searchtype=author&query=Cavoto%2C+G">G. Cavoto</a>, <a href="/search/physics?searchtype=author&query=Cei%2C+F">F. Cei</a>, <a href="/search/physics?searchtype=author&query=Cerri%2C+C">C. Cerri</a>, <a href="/search/physics?searchtype=author&query=Corbo%2C+M">M. Corbo</a>, <a href="/search/physics?searchtype=author&query=Curalli%2C+N">N. Curalli</a>, <a href="/search/physics?searchtype=author&query=De+Bari%2C+A">A. De Bari</a>, <a href="/search/physics?searchtype=author&query=De+Gerone%2C+M">M. De Gerone</a>, <a href="/search/physics?searchtype=author&query=Del+Frate%2C+L">L. Del Frate</a>, <a href="/search/physics?searchtype=author&query=Doke%2C+S">S. Doke</a>, <a href="/search/physics?searchtype=author&query=Dussoni%2C+S">S. Dussoni</a>, <a href="/search/physics?searchtype=author&query=Egger%2C+J">J. Egger</a>, <a href="/search/physics?searchtype=author&query=Fratini%2C+K">K. Fratini</a>, <a href="/search/physics?searchtype=author&query=Fujii%2C+Y">Y. Fujii</a>, <a href="/search/physics?searchtype=author&query=Galli%2C+L">L. Galli</a>, <a href="/search/physics?searchtype=author&query=Galeotti%2C+S">S. Galeotti</a>, <a href="/search/physics?searchtype=author&query=Gallucci%2C+G">G. Gallucci</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">F. Gatti</a>, <a href="/search/physics?searchtype=author&query=Golden%2C+B">B. Golden</a> , et al. (51 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1303.2348v4-abstract-short" style="display: inline;"> The MEG (Mu to Electron Gamma) experiment has been running at the Paul Scherrer Institut (PSI), Switzerland since 2008 to search for the decay \meg\ by using one of the most intense continuous $渭^+$ beams in the world. This paper presents the MEG components: the positron spectrometer, including a thin target, a superconducting magnet, a set of drift chambers for measuring the muon decay vertex and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1303.2348v4-abstract-full').style.display = 'inline'; document.getElementById('1303.2348v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1303.2348v4-abstract-full" style="display: none;"> The MEG (Mu to Electron Gamma) experiment has been running at the Paul Scherrer Institut (PSI), Switzerland since 2008 to search for the decay \meg\ by using one of the most intense continuous $渭^+$ beams in the world. This paper presents the MEG components: the positron spectrometer, including a thin target, a superconducting magnet, a set of drift chambers for measuring the muon decay vertex and the positron momentum, a timing counter for measuring the positron time, and a liquid xenon detector for measuring the photon energy, position and time. The trigger system, the read-out electronics and the data acquisition system are also presented in detail. The paper is completed with a description of the equipment and techniques developed for the calibration in time and energy and the simulation of the whole apparatus. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1303.2348v4-abstract-full').style.display = 'none'; document.getElementById('1303.2348v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 April, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 March, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">59 pages, 90 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C, 73 (2013) 2365 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1303.0754">arXiv:1303.0754</a> <span> [<a href="https://arxiv.org/pdf/1303.0754">pdf</a>, <a href="https://arxiv.org/ps/1303.0754">ps</a>, <a href="https://arxiv.org/format/1303.0754">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> New constraint on the existence of the mu+-> e+ gamma decay </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=MEG+Collaboration"> MEG Collaboration</a>, <a href="/search/physics?searchtype=author&query=Adam%2C+J">J. Adam</a>, <a href="/search/physics?searchtype=author&query=Bai%2C+X">X. Bai</a>, <a href="/search/physics?searchtype=author&query=Baldini%2C+A+M">A. M. Baldini</a>, <a href="/search/physics?searchtype=author&query=Baracchini%2C+E">E. Baracchini</a>, <a href="/search/physics?searchtype=author&query=Bemporad%2C+C">C. Bemporad</a>, <a href="/search/physics?searchtype=author&query=Boca%2C+G">G. Boca</a>, <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">P. W. Cattaneo</a>, <a href="/search/physics?searchtype=author&query=Cavoto%2C+G">G. Cavoto</a>, <a href="/search/physics?searchtype=author&query=Cei%2C+F">F. Cei</a>, <a href="/search/physics?searchtype=author&query=Cerri%2C+C">C. Cerri</a>, <a href="/search/physics?searchtype=author&query=de+Bari%2C+A">A. de Bari</a>, <a href="/search/physics?searchtype=author&query=De+Gerone%2C+M">M. De Gerone</a>, <a href="/search/physics?searchtype=author&query=Doke%2C+T">T. Doke</a>, <a href="/search/physics?searchtype=author&query=Dussoni%2C+S">S. Dussoni</a>, <a href="/search/physics?searchtype=author&query=Egger%2C+J">J. Egger</a>, <a href="/search/physics?searchtype=author&query=Fratini%2C+K">K. Fratini</a>, <a href="/search/physics?searchtype=author&query=Fujii%2C+Y">Y. Fujii</a>, <a href="/search/physics?searchtype=author&query=Galli%2C+L">L. Galli</a>, <a href="/search/physics?searchtype=author&query=Gallucci%2C+G">G. Gallucci</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">F. Gatti</a>, <a href="/search/physics?searchtype=author&query=Golden%2C+B">B. Golden</a>, <a href="/search/physics?searchtype=author&query=Grassi%2C+M">M. Grassi</a>, <a href="/search/physics?searchtype=author&query=Graziosi%2C+A">A. Graziosi</a>, <a href="/search/physics?searchtype=author&query=Grigoriev%2C+D+N">D. N. Grigoriev</a> , et al. (49 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1303.0754v2-abstract-short" style="display: inline;"> The analysis of a combined data set, totaling 3.6 \times 10^14 stopped muons on target, in the search for the lepton flavour violating decay mu^+ -> e^+ gamma is presented. The data collected by the MEG experiment at the Paul Scherrer Institut show no excess of events compared to background expectations and yield a new upper limit on the branching ratio of this decay of 5.7 \times 10^-13 (90% conf… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1303.0754v2-abstract-full').style.display = 'inline'; document.getElementById('1303.0754v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1303.0754v2-abstract-full" style="display: none;"> The analysis of a combined data set, totaling 3.6 \times 10^14 stopped muons on target, in the search for the lepton flavour violating decay mu^+ -> e^+ gamma is presented. The data collected by the MEG experiment at the Paul Scherrer Institut show no excess of events compared to background expectations and yield a new upper limit on the branching ratio of this decay of 5.7 \times 10^-13 (90% confidence level). This represents a four times more stringent limit than the previous world best limit set by MEG. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1303.0754v2-abstract-full').style.display = 'none'; document.getElementById('1303.0754v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 April, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 March, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 3 figures, a version accepted in Phys. Rev. Lett</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1301.7225">arXiv:1301.7225</a> <span> [<a href="https://arxiv.org/pdf/1301.7225">pdf</a>, <a href="https://arxiv.org/format/1301.7225">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> </div> <p class="title is-5 mathjax"> MEG Upgrade Proposal </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Baldini%2C+A+M">A. M. Baldini</a>, <a href="/search/physics?searchtype=author&query=Cei%2C+F">F. Cei</a>, <a href="/search/physics?searchtype=author&query=Cerri%2C+C">C. Cerri</a>, <a href="/search/physics?searchtype=author&query=Dussoni%2C+S">S. Dussoni</a>, <a href="/search/physics?searchtype=author&query=Galli%2C+L">L. Galli</a>, <a href="/search/physics?searchtype=author&query=Grassi%2C+M">M. Grassi</a>, <a href="/search/physics?searchtype=author&query=Nicol%C3%B2%2C+D">D. Nicol貌</a>, <a href="/search/physics?searchtype=author&query=Raffaelli%2C+F">F. Raffaelli</a>, <a href="/search/physics?searchtype=author&query=Sergiampietri%2C+F">F. Sergiampietri</a>, <a href="/search/physics?searchtype=author&query=Signorelli%2C+G">G. Signorelli</a>, <a href="/search/physics?searchtype=author&query=Tenchini%2C+F">F. Tenchini</a>, <a href="/search/physics?searchtype=author&query=Bagliani%2C+D">D. Bagliani</a>, <a href="/search/physics?searchtype=author&query=De+Gerone%2C+M">M. De Gerone</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">F. Gatti</a>, <a href="/search/physics?searchtype=author&query=Baracchini%2C+E">E. Baracchini</a>, <a href="/search/physics?searchtype=author&query=Fujii%2C+Y">Y. Fujii</a>, <a href="/search/physics?searchtype=author&query=Iwamoto%2C+T">T. Iwamoto</a>, <a href="/search/physics?searchtype=author&query=Kaneko%2C+D">D. Kaneko</a>, <a href="/search/physics?searchtype=author&query=Mori%2C+T">T. Mori</a>, <a href="/search/physics?searchtype=author&query=Nishimura%2C+M">M. Nishimura</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">W. Ootani</a>, <a href="/search/physics?searchtype=author&query=Sawada%2C+R">R. Sawada</a>, <a href="/search/physics?searchtype=author&query=Uchiyama%2C+Y">Y. Uchiyama</a>, <a href="/search/physics?searchtype=author&query=Boca%2C+G">G. Boca</a>, <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">P. W. Cattaneo</a> , et al. (43 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1301.7225v2-abstract-short" style="display: inline;"> We propose the continuation of the MEG experiment to search for the charged lepton flavour violating decay (cLFV) 渭\to e 纬, based on an upgrade of the experiment, which aims for a sensitivity enhancement of one order of magnitude compared to the final MEG result, down to the $6 \times 10^{-14}$ level. The key features of this new MEG upgrade are an increased rate capability of all detectors to ena… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1301.7225v2-abstract-full').style.display = 'inline'; document.getElementById('1301.7225v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1301.7225v2-abstract-full" style="display: none;"> We propose the continuation of the MEG experiment to search for the charged lepton flavour violating decay (cLFV) 渭\to e 纬, based on an upgrade of the experiment, which aims for a sensitivity enhancement of one order of magnitude compared to the final MEG result, down to the $6 \times 10^{-14}$ level. The key features of this new MEG upgrade are an increased rate capability of all detectors to enable running at the intensity frontier and improved energy, angular and timing resolutions, for both the positron and photon arms of the detector. On the positron-side a new low-mass, single volume, high granularity tracker is envisaged, in combination with a new highly segmented, fast timing counter array, to track positron from a thinner stopping target. The photon-arm, with the largest liquid xenon (LXe) detector in the world, totalling 900 l, will also be improved by increasing the granularity at the incident face, by replacing the current photomultiplier tubes (PMTs) with a larger number of smaller photosensors and optimizing the photosensor layout also on the lateral faces. A new DAQ scheme involving the implementation of a new combined readout board capable of integrating the diverse functions of digitization, trigger capability and splitter functionality into one condensed unit, is also under development. We describe here the status of the MEG experiment, the scientific merits of the upgrade and the experimental methods we plan to use. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1301.7225v2-abstract-full').style.display = 'none'; document.getElementById('1301.7225v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 February, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 January, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">A. M. Baldini and T. Mori Spokespersons. Research proposal submitted to the Paul Scherrer Institute Research Committee for Particle Physics at the Ring Cyclotron. 131 Pages</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/physics/0407033">arXiv:physics/0407033</a> <span> [<a href="https://arxiv.org/pdf/physics/0407033">pdf</a>, <a href="https://arxiv.org/ps/physics/0407033">ps</a>, <a href="https://arxiv.org/format/physics/0407033">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2005.02.029">10.1016/j.nima.2005.02.029 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Absorption of Scintillation Light in a 100 $\ell$ Liquid Xenon$纬$ Ray Detector and Expected Detector Performance </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Baldini%2C+A">A. Baldini</a>, <a href="/search/physics?searchtype=author&query=Bemporad%2C+C">C. Bemporad</a>, <a href="/search/physics?searchtype=author&query=Cei%2C+F">F. Cei</a>, <a href="/search/physics?searchtype=author&query=Doke%2C+T">T. Doke</a>, <a href="/search/physics?searchtype=author&query=Grassi%2C+M">M. Grassi</a>, <a href="/search/physics?searchtype=author&query=Grebenuk%2C+A+A">A. A. Grebenuk</a>, <a href="/search/physics?searchtype=author&query=Grigoriev%2C+D+N">D. N. Grigoriev</a>, <a href="/search/physics?searchtype=author&query=Haruyama%2C+T">T. Haruyama</a>, <a href="/search/physics?searchtype=author&query=Kasami%2C+K">K. Kasami</a>, <a href="/search/physics?searchtype=author&query=Kikuchi%2C+J">J. Kikuchi</a>, <a href="/search/physics?searchtype=author&query=Maki%2C+A">A. Maki</a>, <a href="/search/physics?searchtype=author&query=Mashimo%2C+T">T. Mashimo</a>, <a href="/search/physics?searchtype=author&query=Mihara%2C+S">S. Mihara</a>, <a href="/search/physics?searchtype=author&query=Mitsuhashi%2C+T">T. Mitsuhashi</a>, <a href="/search/physics?searchtype=author&query=Mori%2C+T">T. Mori</a>, <a href="/search/physics?searchtype=author&query=Nicolo%60%2C+D">D. Nicolo`</a>, <a href="/search/physics?searchtype=author&query=Nishiguchi%2C+H">H. Nishiguchi</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">W. Ootani</a>, <a href="/search/physics?searchtype=author&query=Ozone%2C+K">K. Ozone</a>, <a href="/search/physics?searchtype=author&query=Papa%2C+A">A. Papa</a>, <a href="/search/physics?searchtype=author&query=Pazzi%2C+R">R. Pazzi</a>, <a href="/search/physics?searchtype=author&query=Ritt%2C+S">S. Ritt</a>, <a href="/search/physics?searchtype=author&query=Sawada%2C+R">R. Sawada</a>, <a href="/search/physics?searchtype=author&query=Sergiampietri%2C+F">F. Sergiampietri</a>, <a href="/search/physics?searchtype=author&query=Signorelli%2C+G">G. Signorelli</a> , et al. (6 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="physics/0407033v1-abstract-short" style="display: inline;"> An 800L liquid xenon scintillation $纬$ ray detector is being developed for the MEG experiment which will search for $渭^+\to\mathrm{e}^+纬$ decay at the Paul Scherrer Institut. Absorption of scintillation light of xenon by impurities might possibly limit the performance of such a detector. We used a 100L prototype with an active volume of 372x372x496 mm$^3$ to study the scintillation light absorpt… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0407033v1-abstract-full').style.display = 'inline'; document.getElementById('physics/0407033v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="physics/0407033v1-abstract-full" style="display: none;"> An 800L liquid xenon scintillation $纬$ ray detector is being developed for the MEG experiment which will search for $渭^+\to\mathrm{e}^+纬$ decay at the Paul Scherrer Institut. Absorption of scintillation light of xenon by impurities might possibly limit the performance of such a detector. We used a 100L prototype with an active volume of 372x372x496 mm$^3$ to study the scintillation light absorption. We have developed a method to evaluate the light absorption, separately from elastic scattering of light, by measuring cosmic rays and $伪$ sources. By using a suitable purification technique, an absorption length longer than 100 cm has been achieved. The effects of the light absorption on the energy resolution are estimated by Monte Carlo simulation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0407033v1-abstract-full').style.display = 'none'; document.getElementById('physics/0407033v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 July, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2004. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">18 pages, 10 figures (eps). Submitted to Nucl. Instr. and Meth. A</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> UT-ICEPP 04-02 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl.Instrum.Meth. A545 (2005) 753-764 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/physics/0401072">arXiv:physics/0401072</a> <span> [<a href="https://arxiv.org/pdf/physics/0401072">pdf</a>, <a href="https://arxiv.org/ps/physics/0401072">ps</a>, <a href="https://arxiv.org/format/physics/0401072">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1109/TDEI.2006.1657967">10.1109/TDEI.2006.1657967 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Liquid Xe scintillation calorimetry and Xe optical properties </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Baldini%2C+A">A. Baldini</a>, <a href="/search/physics?searchtype=author&query=Bemporad%2C+C">C. Bemporad</a>, <a href="/search/physics?searchtype=author&query=Cei%2C+F">F. Cei</a>, <a href="/search/physics?searchtype=author&query=Doke%2C+T">T. Doke</a>, <a href="/search/physics?searchtype=author&query=Grassi%2C+M">M. Grassi</a>, <a href="/search/physics?searchtype=author&query=Haruyama%2C+T">T. Haruyama</a>, <a href="/search/physics?searchtype=author&query=Mihara%2C+S">S. Mihara</a>, <a href="/search/physics?searchtype=author&query=Mori%2C+T">T. Mori</a>, <a href="/search/physics?searchtype=author&query=Nicol%C3%B2%2C+D">D. Nicol貌</a>, <a href="/search/physics?searchtype=author&query=Nishiguchi%2C+H">H. Nishiguchi</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">W. Ootani</a>, <a href="/search/physics?searchtype=author&query=Ozone%2C+K">K. Ozone</a>, <a href="/search/physics?searchtype=author&query=Papa%2C+A">A. Papa</a>, <a href="/search/physics?searchtype=author&query=Pazzi%2C+R">R. Pazzi</a>, <a href="/search/physics?searchtype=author&query=Sawada%2C+R">R. Sawada</a>, <a href="/search/physics?searchtype=author&query=Sergiampietri%2C+F">F. Sergiampietri</a>, <a href="/search/physics?searchtype=author&query=Signorelli%2C+G">G. Signorelli</a>, <a href="/search/physics?searchtype=author&query=Suzuki%2C+S">S. Suzuki</a>, <a href="/search/physics?searchtype=author&query=Terasawa%2C+K">K. Terasawa</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="physics/0401072v1-abstract-short" style="display: inline;"> The optical properties of LXe in the vacuum ultra violet (VUV), determining the performance of a scintillation calorimeter, are discussed in detail. The available data, measured in a wider spectral region from visible to UV light, and in a large range of Xe densities, from gas to liquid, are examined. It is shown that this information can be used for deriving the LXe optical properties in the VU… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0401072v1-abstract-full').style.display = 'inline'; document.getElementById('physics/0401072v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="physics/0401072v1-abstract-full" style="display: none;"> The optical properties of LXe in the vacuum ultra violet (VUV), determining the performance of a scintillation calorimeter, are discussed in detail. The available data, measured in a wider spectral region from visible to UV light, and in a large range of Xe densities, from gas to liquid, are examined. It is shown that this information can be used for deriving the LXe optical properties in the VUV. A comparison is made with the few direct measurements in LXe for VUV light resulting from the LXe excitation by ionizing particles. A useful relation is obtained which connects the Rayleigh scattering length to the refractive index in LXe. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0401072v1-abstract-full').style.display = 'none'; document.getElementById('physics/0401072v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 January, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2004. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">20 pages, 12 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> IEEE Trans.Dielectr.Electr.Insul. 13 (2006) 547-555 </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" 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