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</div> <div class="control"> <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/2403.13618">arXiv:2403.13618</a> <span> [<a href="https://arxiv.org/pdf/2403.13618">pdf</a>, <a href="https://arxiv.org/format/2403.13618">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"> Experience gained about Resistive Plate Chambers ageing from the ALICE Muon TRigger/IDentifier detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">Alessandro Ferretti</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="2403.13618v1-abstract-short" style="display: inline;"> The ALICE Muon IDentifier is composed of 72 single-gap bakelite Resistive Plate Chambers, which have been operational since 2009 in maxi-avalanche mode (discrimination threshold:7 mV without amplification) with a Tetrafluoroethane/Isobutane/Sulfur Hexafluoride gas mixture, undergoing counting rates of the order of tens of Hz/cm^2. In this talk, the long-term performance and stability of the RPC sy… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.13618v1-abstract-full').style.display = 'inline'; document.getElementById('2403.13618v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.13618v1-abstract-full" style="display: none;"> The ALICE Muon IDentifier is composed of 72 single-gap bakelite Resistive Plate Chambers, which have been operational since 2009 in maxi-avalanche mode (discrimination threshold:7 mV without amplification) with a Tetrafluoroethane/Isobutane/Sulfur Hexafluoride gas mixture, undergoing counting rates of the order of tens of Hz/cm^2. In this talk, the long-term performance and stability of the RPC system will be discussed, in terms of efficiency, dark current and dark rate. An assessment of potential signs of ageing observed on the detectors will be presented, together with a summary of the most common hardware problems experienced. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.13618v1-abstract-full').style.display = 'none'; document.getElementById('2403.13618v1-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 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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, 8 figures. Proceedings of the 3rd International Conference on Detector Stability and Aging Phenomena in Gaseous Detectors, 6-10 November 2023, CERN</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2402.19408">arXiv:2402.19408</a> <span> [<a href="https://arxiv.org/pdf/2402.19408">pdf</a>, <a href="https://arxiv.org/format/2402.19408">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/10.1016/j.nima.2024.169672">10.1016/j.nima.2024.169672 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> In-beam performance of a Resistive Plate Chamber operated with eco-friendly gas mixtures </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Quaglia%2C+L">L. Quaglia</a>, <a href="/search/physics?searchtype=author&query=Abbrescia%2C+M">M. Abbrescia</a>, <a href="/search/physics?searchtype=author&query=Aielli%2C+G">G. Aielli</a>, <a href="/search/physics?searchtype=author&query=Aly%2C+R">R. Aly</a>, <a href="/search/physics?searchtype=author&query=Arena%2C+M+C">M. C. Arena</a>, <a href="/search/physics?searchtype=author&query=Barroso%2C+M">M. Barroso</a>, <a href="/search/physics?searchtype=author&query=Benussi%2C+L">L. Benussi</a>, <a href="/search/physics?searchtype=author&query=Bianco%2C+S">S. Bianco</a>, <a href="/search/physics?searchtype=author&query=Boscherini%2C+D">D. Boscherini</a>, <a href="/search/physics?searchtype=author&query=Bordon%2C+F">F. Bordon</a>, <a href="/search/physics?searchtype=author&query=Bruni%2C+A">A. Bruni</a>, <a href="/search/physics?searchtype=author&query=Buontempo%2C+S">S. Buontempo</a>, <a href="/search/physics?searchtype=author&query=Busato%2C+M">M. Busato</a>, <a href="/search/physics?searchtype=author&query=Camarri%2C+P">P. Camarri</a>, <a href="/search/physics?searchtype=author&query=Cardarelli%2C+R">R. Cardarelli</a>, <a href="/search/physics?searchtype=author&query=Congedo%2C+L">L. Congedo</a>, <a href="/search/physics?searchtype=author&query=Damiao%2C+D+D+J">D. De Jesus Damiao</a>, <a href="/search/physics?searchtype=author&query=De+Serio%2C+M">M. De Serio</a>, <a href="/search/physics?searchtype=author&query=Di+Ciaccio%2C+A">A. Di Ciaccio</a>, <a href="/search/physics?searchtype=author&query=Di+Stante%2C+L">L. Di Stante</a>, <a href="/search/physics?searchtype=author&query=Dupieux%2C+P">P. Dupieux</a>, <a href="/search/physics?searchtype=author&query=Eysermans%2C+J">J. Eysermans</a>, <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">A. Ferretti</a>, <a href="/search/physics?searchtype=author&query=Galati%2C+G">G. Galati</a>, <a href="/search/physics?searchtype=author&query=Gagliardi%2C+M">M. Gagliardi</a> , et al. (32 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="2402.19408v1-abstract-short" style="display: inline;"> ALICE (A Large Ion Collider Experiment) studies the Quark-Gluon Plasma (QGP): a deconfined state of matter obtained in ultra-relativistic heavy-ion collisions. One of the probes for QGP study are quarkonia and open heavy flavour, of which ALICE exploits the muonic decay. A set of Resistive Plate Chambers (RPCs), placed in the forward rapidity region of the ALICE detector, is used for muon identifi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.19408v1-abstract-full').style.display = 'inline'; document.getElementById('2402.19408v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.19408v1-abstract-full" style="display: none;"> ALICE (A Large Ion Collider Experiment) studies the Quark-Gluon Plasma (QGP): a deconfined state of matter obtained in ultra-relativistic heavy-ion collisions. One of the probes for QGP study are quarkonia and open heavy flavour, of which ALICE exploits the muonic decay. A set of Resistive Plate Chambers (RPCs), placed in the forward rapidity region of the ALICE detector, is used for muon identification purposes. The correct operation of these detectors is ensured by the choice of the proper gas mixture. Currently they are operated with a mixture of C$_{2}$H$_{2}$F$_{4}$, i-C$_{4}$H$_{10}$ and SF$_{6}$ but, starting from 2017, new EU regulations have enforced a progressive phase-out of C$_{2}$H$_{2}$F$_{4}$ because of its large Global Warming Potential (GWP), making it difficult and costly to purchase. CERN asked LHC experiments to reduce greenhouse gases emissions, to which RPC operation contributes significantly. A possible candidate for C$_{2}$H$_{2}$F$_{4}$ replacement is the C$_{3}$H$_{2}$F$_{4}$ (diluted with other gases, such as CO$_{2}$), which has been extensively tested using cosmic rays. Promising gas mixtures have been devised; the next crucial steps are the detailed in-beam characterization of such mixtures as well as the study of their performance under increasing irradiation levels. This contribution will describe the methodology and results of beam tests carried out at the CERN GIF++ (equipped with a high activity $^{137}$Cs source and muon beam) with an ALICE-like RPC prototype, operated with several mixtures with varying proportions of CO$_{2}$, C$_{3}$H$_{2}$F$_{4}$, i-C$_{4}$H$_{10}$ and SF$_{6}$ . Absorbed currents, efficiencies, prompt charges, cluster sizes, time resolutions and rate capabilities will be presented, both from digitized (for detailed shape and charge analysis) and discriminated (using the same front-end electronics as employed in ALICE) signals. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.19408v1-abstract-full').style.display = 'none'; document.getElementById('2402.19408v1-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> 29 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2402.19395">arXiv:2402.19395</a> <span> [<a href="https://arxiv.org/pdf/2402.19395">pdf</a>, <a href="https://arxiv.org/format/2402.19395">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.2024.169747">10.1016/j.nima.2024.169747 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Exploring Eco-Friendly Gas Mixtures for Resistive Plate Chambers: A Comprehensive Study on Performance and Aging </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=collaboration%2C+T+R+E">The RPC ECOGas@GIF++ collaboration</a>, <a href="/search/physics?searchtype=author&query=%3A"> :</a>, <a href="/search/physics?searchtype=author&query=Quaglia%2C+L">L. Quaglia</a>, <a href="/search/physics?searchtype=author&query=Abbrescia%2C+M">M. Abbrescia</a>, <a href="/search/physics?searchtype=author&query=Aielli%2C+G">G. Aielli</a>, <a href="/search/physics?searchtype=author&query=Aly%2C+R">R. Aly</a>, <a href="/search/physics?searchtype=author&query=Arena%2C+M+C">M. C. Arena</a>, <a href="/search/physics?searchtype=author&query=Barroso%2C+M">M. Barroso</a>, <a href="/search/physics?searchtype=author&query=Benussi%2C+L">L. Benussi</a>, <a href="/search/physics?searchtype=author&query=Bianco%2C+S">S. Bianco</a>, <a href="/search/physics?searchtype=author&query=Boscherini%2C+D">D. Boscherini</a>, <a href="/search/physics?searchtype=author&query=Bordon%2C+F">F. Bordon</a>, <a href="/search/physics?searchtype=author&query=Bruni%2C+A">A. Bruni</a>, <a href="/search/physics?searchtype=author&query=Buontempo%2C+S">S. Buontempo</a>, <a href="/search/physics?searchtype=author&query=Busato%2C+M">M. Busato</a>, <a href="/search/physics?searchtype=author&query=Camarri%2C+P">P. Camarri</a>, <a href="/search/physics?searchtype=author&query=Cardarelli%2C+R">R. Cardarelli</a>, <a href="/search/physics?searchtype=author&query=Congedo%2C+L">L. Congedo</a>, <a href="/search/physics?searchtype=author&query=Damiao%2C+D+D+J">D. De Jesus Damiao</a>, <a href="/search/physics?searchtype=author&query=De+Serio%2C+M">M. De Serio</a>, <a href="/search/physics?searchtype=author&query=Di+Ciaccio%2C+A">A. Di Ciaccio</a>, <a href="/search/physics?searchtype=author&query=Di+Stante%2C+L">L. Di Stante</a>, <a href="/search/physics?searchtype=author&query=Dupieux%2C+P">P. Dupieux</a>, <a href="/search/physics?searchtype=author&query=Eysermans%2C+J">J. Eysermans</a>, <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">A. Ferretti</a> , et al. (35 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="2402.19395v1-abstract-short" style="display: inline;"> Resistive Plate Chambers (RPCs) are gaseous detectors widely used in high energy physics experiments, operating with a gas mixture primarily containing Tetrafluoroethane (C$_{2}$H$_{2}$F$_{4}$), commonly known as R-134a, which has a global warming potential (GWP) of 1430. To comply with European regulations and explore environmentally friendly alternatives, the RPC EcoGas@GIF++ collaboration, invo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.19395v1-abstract-full').style.display = 'inline'; document.getElementById('2402.19395v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.19395v1-abstract-full" style="display: none;"> Resistive Plate Chambers (RPCs) are gaseous detectors widely used in high energy physics experiments, operating with a gas mixture primarily containing Tetrafluoroethane (C$_{2}$H$_{2}$F$_{4}$), commonly known as R-134a, which has a global warming potential (GWP) of 1430. To comply with European regulations and explore environmentally friendly alternatives, the RPC EcoGas@GIF++ collaboration, involving ALICE, ATLAS, CMS, LHCb/SHiP, and EP-DT communities, has undertaken intensive R\&D efforts to explore new gas mixtures for RPC technology. A leading alternative under investigation is HFO1234ze, boasting a low GWP of 6 and demonstrating reasonable performance compared to R-134a. Over the past few years, RPC detectors with slightly different characteristics and electronics have been studied using HFO and CO$_{2}$-based gas mixtures at the CERN Gamma Irradiation Facility. An aging test campaign was launched in August 2022, and during the latest test beam in July 2023, all detector systems underwent evaluation. This contribution will report the results of the aging studies and the performance evaluations of the detectors with and without irradiation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.19395v1-abstract-full').style.display = 'none'; document.getElementById('2402.19395v1-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> 29 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2311.17574">arXiv:2311.17574</a> <span> [<a href="https://arxiv.org/pdf/2311.17574">pdf</a>, <a href="https://arxiv.org/format/2311.17574">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"> Preliminary results on the long term operation of RPCs with eco-friendly gas mixtures under irradiation at the CERN Gamma Irradiation Facility </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Quaglia%2C+L">L. Quaglia</a>, <a href="/search/physics?searchtype=author&query=Ramos%2C+D">D. Ramos</a>, <a href="/search/physics?searchtype=author&query=Abbrescia%2C+M">M. Abbrescia</a>, <a href="/search/physics?searchtype=author&query=Aielli%2C+G">G. Aielli</a>, <a href="/search/physics?searchtype=author&query=Aly%2C+R">R. Aly</a>, <a href="/search/physics?searchtype=author&query=Arena%2C+M+C">M. C. Arena</a>, <a href="/search/physics?searchtype=author&query=Barroso%2C+M">M. Barroso</a>, <a href="/search/physics?searchtype=author&query=Benussi%2C+L">L. Benussi</a>, <a href="/search/physics?searchtype=author&query=Bianco%2C+S">S. Bianco</a>, <a href="/search/physics?searchtype=author&query=Boscherini%2C+D">D. Boscherini</a>, <a href="/search/physics?searchtype=author&query=Bordon%2C+F">F. Bordon</a>, <a href="/search/physics?searchtype=author&query=Bruni%2C+A">A. Bruni</a>, <a href="/search/physics?searchtype=author&query=Buontempo%2C+S">S. Buontempo</a>, <a href="/search/physics?searchtype=author&query=Busato%2C+M">M. Busato</a>, <a href="/search/physics?searchtype=author&query=Camarri%2C+P">P. Camarri</a>, <a href="/search/physics?searchtype=author&query=Cardarelli%2C+R">R. Cardarelli</a>, <a href="/search/physics?searchtype=author&query=Congedo%2C+L">L. Congedo</a>, <a href="/search/physics?searchtype=author&query=Damiao%2C+D+D+J">D. De Jesus Damiao</a>, <a href="/search/physics?searchtype=author&query=De+Serio%2C+M">M. De Serio</a>, <a href="/search/physics?searchtype=author&query=Di+Ciacco%2C+A">A. Di Ciacco</a>, <a href="/search/physics?searchtype=author&query=Di+Stante%2C+L">L. Di Stante</a>, <a href="/search/physics?searchtype=author&query=Dupieux%2C+P">P. Dupieux</a>, <a href="/search/physics?searchtype=author&query=Eysermans%2C+J">J. Eysermans</a>, <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">A. Ferretti</a>, <a href="/search/physics?searchtype=author&query=Galati%2C+G">G. Galati</a> , et al. (33 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="2311.17574v1-abstract-short" style="display: inline;"> Since 2019 a collaboration between researchers from various institutes and experiments (i.e. ATLAS, CMS, ALICE, LHCb/SHiP and the CERN EP-DT group), has been operating several RPCs with diverse electronics, gas gap thicknesses and detector layouts at the CERN Gamma Irradiation Facility (GIF++). The studies aim at assessing the performance of RPCs when filled with new eco-friendly gas mixtures in a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.17574v1-abstract-full').style.display = 'inline'; document.getElementById('2311.17574v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.17574v1-abstract-full" style="display: none;"> Since 2019 a collaboration between researchers from various institutes and experiments (i.e. ATLAS, CMS, ALICE, LHCb/SHiP and the CERN EP-DT group), has been operating several RPCs with diverse electronics, gas gap thicknesses and detector layouts at the CERN Gamma Irradiation Facility (GIF++). The studies aim at assessing the performance of RPCs when filled with new eco-friendly gas mixtures in avalanche mode and in view of evaluating possible ageing effects after long high background irradiation periods, e.g. High-Luminosity LHC phase. This challenging research is also part of a task of the European AidaInnova project. A promising eco-friendly gas identified for RPC operation is the tetrafluoruropropene (C$_{3}$H$_{2}$F$_{4}$, commercially known as HFO-1234ze) that has been studied at the CERN GIF++ in combination with different percentages of CO$_2$. Between the end of 2021 and 2022 several beam tests have been carried out to establish the performance of RPCs operated with such mixtures before starting the irradiation campaign for the ageing study. Results of these tests for different RPCs layouts and different gas mixtures, under increasing background rates are presented here, together with the preliminary outcome of the detector ageing tests. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.17574v1-abstract-full').style.display = 'none'; document.getElementById('2311.17574v1-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> 29 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2311.08259">arXiv:2311.08259</a> <span> [<a href="https://arxiv.org/pdf/2311.08259">pdf</a>, <a href="https://arxiv.org/format/2311.08259">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"> High-rate tests on Resistive Plate Chambers operated with eco-friendly gas mixtures </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Abbrescia%2C+M">M. Abbrescia</a>, <a href="/search/physics?searchtype=author&query=Aielli%2C+G">G. Aielli</a>, <a href="/search/physics?searchtype=author&query=Aly%2C+R">R. Aly</a>, <a href="/search/physics?searchtype=author&query=Arena%2C+M+C">M. C. Arena</a>, <a href="/search/physics?searchtype=author&query=Barroso%2C+M">M. Barroso</a>, <a href="/search/physics?searchtype=author&query=Benussi%2C+L">L. Benussi</a>, <a href="/search/physics?searchtype=author&query=Bianco%2C+S">S. Bianco</a>, <a href="/search/physics?searchtype=author&query=Bordon%2C+F">F. Bordon</a>, <a href="/search/physics?searchtype=author&query=Boscherini%2C+D">D. Boscherini</a>, <a href="/search/physics?searchtype=author&query=Bruni%2C+A">A. Bruni</a>, <a href="/search/physics?searchtype=author&query=Buontempo%2C+S">S. Buontempo</a>, <a href="/search/physics?searchtype=author&query=Busato%2C+M">M. Busato</a>, <a href="/search/physics?searchtype=author&query=Camarri%2C+P">P. Camarri</a>, <a href="/search/physics?searchtype=author&query=Cardarelli%2C+R">R. Cardarelli</a>, <a href="/search/physics?searchtype=author&query=Congedo%2C+L">L. Congedo</a>, <a href="/search/physics?searchtype=author&query=Damiao%2C+D+D+J">D. De Jesus Damiao</a>, <a href="/search/physics?searchtype=author&query=De+Serio%2C+M">M. De Serio</a>, <a href="/search/physics?searchtype=author&query=Di+Ciaccio%2C+A">A. Di Ciaccio</a>, <a href="/search/physics?searchtype=author&query=Di+Stante%2C+L">L. Di Stante</a>, <a href="/search/physics?searchtype=author&query=Dupieux%2C+P">P. Dupieux</a>, <a href="/search/physics?searchtype=author&query=Eysermans%2C+J">J. Eysermans</a>, <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">A. Ferretti</a>, <a href="/search/physics?searchtype=author&query=Galati%2C+G">G. Galati</a>, <a href="/search/physics?searchtype=author&query=Gagliardi%2C+M">M. Gagliardi</a>, <a href="/search/physics?searchtype=author&query=Guida%2C+R">R. Guida</a> , et al. (30 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="2311.08259v1-abstract-short" style="display: inline;"> Results obtained by the RPC ECOgas@GIF++ Collaboration, using Resistive Plate Chambers operated with new, eco-friendly gas mixtures, based on Tetrafluoropropene and carbon dioxide, are shown and discussed in this paper. Tests aimed to assess the performance of this kind of detectors in high-irradiation conditions, analogous to the ones foreseen for the coming years at the Large Hadron Collider exp… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.08259v1-abstract-full').style.display = 'inline'; document.getElementById('2311.08259v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.08259v1-abstract-full" style="display: none;"> Results obtained by the RPC ECOgas@GIF++ Collaboration, using Resistive Plate Chambers operated with new, eco-friendly gas mixtures, based on Tetrafluoropropene and carbon dioxide, are shown and discussed in this paper. Tests aimed to assess the performance of this kind of detectors in high-irradiation conditions, analogous to the ones foreseen for the coming years at the Large Hadron Collider experiments, were performed, and demonstrate a performance basically similar to the one obtained with the gas mixtures currently in use, based on Tetrafluoroethane, which is being progressively phased out for its possible contribution to the greenhouse effect. Long term aging tests are also being carried out, with the goal to demonstrate the possibility of using these eco-friendly gas mixtures during the whole High Luminosity phase of the Large Hadron Collider. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.08259v1-abstract-full').style.display = 'none'; document.getElementById('2311.08259v1-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> 14 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">Submitted to European Physical Journal C on October 24, 2023, 15 pages, 14 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/2302.07759">arXiv:2302.07759</a> <span> [<a href="https://arxiv.org/pdf/2302.07759">pdf</a>, <a href="https://arxiv.org/format/2302.07759">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-ph</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/10.1021/acs.jctc.3c00652">10.1021/acs.jctc.3c00652 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> koopmans: an open-source package for accurately and efficiently predicting spectral properties with Koopmans functionals </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Linscott%2C+E">Edward Linscott</a>, <a href="/search/physics?searchtype=author&query=Colonna%2C+N">Nicola Colonna</a>, <a href="/search/physics?searchtype=author&query=De+Gennaro%2C+R">Riccardo De Gennaro</a>, <a href="/search/physics?searchtype=author&query=Nguyen%2C+N+L">Ngoc Linh Nguyen</a>, <a href="/search/physics?searchtype=author&query=Borghi%2C+G">Giovanni Borghi</a>, <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">Andrea Ferretti</a>, <a href="/search/physics?searchtype=author&query=Dabo%2C+I">Ismaila Dabo</a>, <a href="/search/physics?searchtype=author&query=Marzari%2C+N">Nicola Marzari</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="2302.07759v4-abstract-short" style="display: inline;"> Over the past decade we have developed Koopmans functionals, a computationally efficient approach for predicting spectral properties with an orbital-density-dependent functional framework. These functionals impose a generalized piecewise linearity condition to the entire electronic manifold, ensuring that orbital energies match the corresponding electron removal/addition energy differences (in con… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.07759v4-abstract-full').style.display = 'inline'; document.getElementById('2302.07759v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2302.07759v4-abstract-full" style="display: none;"> Over the past decade we have developed Koopmans functionals, a computationally efficient approach for predicting spectral properties with an orbital-density-dependent functional framework. These functionals impose a generalized piecewise linearity condition to the entire electronic manifold, ensuring that orbital energies match the corresponding electron removal/addition energy differences (in contrast to semi-local DFT, where a mismatch between the two lies at the heart of the band gap problem and, more generally, the unreliability of Kohn-Sham orbital energies). This strategy has proven to be very powerful, yielding molecular orbital energies and solid-state band structures with comparable accuracy to many-body perturbation theory but at greatly reduced computational cost while preserving a functional formulation. This paper reviews the theory of Koopmans functionals, discusses the algorithms necessary for their implementation, and introduces koopmans, an open-source package that contains all of the code and workflows needed to perform Koopmans functional calculations and obtain reliable spectral properties of molecules and materials. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.07759v4-abstract-full').style.display = 'none'; document.getElementById('2302.07759v4-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 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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">73 pages, 4 figures, 3 tables. Document includes supporting information</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2212.14452">arXiv:2212.14452</a> <span> [<a href="https://arxiv.org/pdf/2212.14452">pdf</a>, <a href="https://arxiv.org/format/2212.14452">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-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"> Letter of Intent: the NA60+ experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ahdida%2C+C">C. Ahdida</a>, <a href="/search/physics?searchtype=author&query=Alocco%2C+G">G. Alocco</a>, <a href="/search/physics?searchtype=author&query=Antinori%2C+F">F. Antinori</a>, <a href="/search/physics?searchtype=author&query=Arba%2C+M">M. Arba</a>, <a href="/search/physics?searchtype=author&query=Aresti%2C+M">M. Aresti</a>, <a href="/search/physics?searchtype=author&query=Arnaldi%2C+R">R. Arnaldi</a>, <a href="/search/physics?searchtype=author&query=Roldan%2C+A+B">A. Baratto Roldan</a>, <a href="/search/physics?searchtype=author&query=Beole%2C+S">S. Beole</a>, <a href="/search/physics?searchtype=author&query=Beraudo%2C+A">A. Beraudo</a>, <a href="/search/physics?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/physics?searchtype=author&query=Bianchi%2C+L">L. Bianchi</a>, <a href="/search/physics?searchtype=author&query=Borysova%2C+M">M. Borysova</a>, <a href="/search/physics?searchtype=author&query=Bressler%2C+S">S. Bressler</a>, <a href="/search/physics?searchtype=author&query=Bufalino%2C+S">S. Bufalino</a>, <a href="/search/physics?searchtype=author&query=Casula%2C+E">E. Casula</a>, <a href="/search/physics?searchtype=author&query=Cicalo%2C+C">C. Cicalo</a>, <a href="/search/physics?searchtype=author&query=Coli%2C+S">S. Coli</a>, <a href="/search/physics?searchtype=author&query=Cortese%2C+P">P. Cortese</a>, <a href="/search/physics?searchtype=author&query=Dainese%2C+A">A. Dainese</a>, <a href="/search/physics?searchtype=author&query=Danielsson%2C+H">H. Danielsson</a>, <a href="/search/physics?searchtype=author&query=De+Falco%2C+A">A. De Falco</a>, <a href="/search/physics?searchtype=author&query=Dehmelt%2C+K">K. Dehmelt</a>, <a href="/search/physics?searchtype=author&query=Drees%2C+A">A. Drees</a>, <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">A. Ferretti</a>, <a href="/search/physics?searchtype=author&query=Fionda%2C+F">F. Fionda</a> , et al. (37 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="2212.14452v1-abstract-short" style="display: inline;"> We propose a new fixed-target experiment for the study of electromagnetic and hard probes of the Quark-Gluon Plasma (QGP) in heavy-ion collisions at the CERN SPS. The experiment aims at performing measurements of the dimuon spectrum from threshold up to the charmonium region, and of hadronic decays of charm and strange hadrons. It is based on a muon spectrometer, which includes a toroidal magnet a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.14452v1-abstract-full').style.display = 'inline'; document.getElementById('2212.14452v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2212.14452v1-abstract-full" style="display: none;"> We propose a new fixed-target experiment for the study of electromagnetic and hard probes of the Quark-Gluon Plasma (QGP) in heavy-ion collisions at the CERN SPS. The experiment aims at performing measurements of the dimuon spectrum from threshold up to the charmonium region, and of hadronic decays of charm and strange hadrons. It is based on a muon spectrometer, which includes a toroidal magnet and six planes of tracking detectors, coupled to a vertex spectrometer, equipped with Si MAPS immersed in a dipole field. High luminosity is an essential requirement for the experiment, with the goal of taking data with 10$^6$ incident ions/s, at collision energies ranging from $\sqrt{s_{\rm NN}} = 6.3$ GeV ($E_{\rm lab}= 20$ A GeV) to top SPS energy ($\sqrt{s_{\rm NN}} = 17.3$ GeV, $E_{\rm lab}= 158$ A GeV). This document presents the physics motivation, the foreseen experimental set-up including integration and radioprotection studies, the current detector choices together with the status of the corresponding R&D, and the outcome of physics performance studies. A preliminary cost evaluation is also carried out. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.14452v1-abstract-full').style.display = 'none'; document.getElementById('2212.14452v1-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> 29 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">Letter of Intent submitted to the CERN SPSC</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-SPSC-2022-036 / SPSC-I-259 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.16241">arXiv:2210.16241</a> <span> [<a href="https://arxiv.org/pdf/2210.16241">pdf</a>, <a href="https://arxiv.org/format/2210.16241">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"> ALICE upgrades for Run 4 and Run 5 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">A. Ferretti</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="2210.16241v1-abstract-short" style="display: inline;"> In view of Run 4 at the LHC, presently scheduled from 2029 onwards, ALICE is pursuing several upgrades to further extend its physics reach. In order to improve heavy-flavor hadron and dielectron measurements which rely on secondary vertexing, a reduction of the material budget of the innermost layers of the Inner Tracking System is needed. This can be achieved with bent pixel sensors, arranged in… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.16241v1-abstract-full').style.display = 'inline'; document.getElementById('2210.16241v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.16241v1-abstract-full" style="display: none;"> In view of Run 4 at the LHC, presently scheduled from 2029 onwards, ALICE is pursuing several upgrades to further extend its physics reach. In order to improve heavy-flavor hadron and dielectron measurements which rely on secondary vertexing, a reduction of the material budget of the innermost layers of the Inner Tracking System is needed. This can be achieved with bent pixel sensors, arranged in half-cylinder shapes with integrated power lines and data buses, allowing to get rid of most of the supporting structure and of the water cooling. Moreover, a new Forward Calorimeter (FoCal), covering pseudorapidities of $3.2<畏<5.8$, has been proposed to measure small-x (down to $10^{-6}$) gluon distributions via prompt photon production. The FoCal will be composed of a highly granular Si+W electromagnetic calorimeter combined with a conventional sampling hadronic calorimeter, and will significantly enhance the scope of ALICE for inclusive and correlation measurements with mesons, photons, and jets. For Run 5 and beyond, the ALICE 3 project has been proposed. It consists of a novel compact detector based on monolithic silicon sensors, with ultra-thin layers near the vertex, high readout rate capabilities, superb pointing resolution, excellent tracking and particle identification over a large acceptance. Such a detector enables a rich physics program, ranging from electromagnetic probes at ultra-low transverse momenta to precision physics in the charm and beauty sector. For particle identification, a sequence of detector systems is foreseen: a combination of a Time-Of-Flight system, a Ring-Imaging Cherenkov detector, an electromagnetic calorimeter, a muon identifier, and a dedicated forward detector for ultra-soft photons. In these proceedings, the upgrade plans will be shown together with the status of R\&D on ITS3 and FoCal and with the concepts and requirements of ALICE 3. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.16241v1-abstract-full').style.display = 'none'; document.getElementById('2210.16241v1-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 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">4 pages, 3 figures. Proceedings of QCD22: 25th High-Energy Physics International Conference in Quantum ChromoDynamics, Montpellier (France), July 4-7, 2022</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2209.02020">arXiv:2209.02020</a> <span> [<a href="https://arxiv.org/pdf/2209.02020">pdf</a>, <a href="https://arxiv.org/format/2209.02020">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"> Searching for an eco-friendly gas mixture for the ALICE Resistive Plate Chambers </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Quaglia%2C+L">Luca Quaglia</a>, <a href="/search/physics?searchtype=author&query=Cardarelli%2C+R">R. Cardarelli</a>, <a href="/search/physics?searchtype=author&query=Liberti%2C+B">B. Liberti</a>, <a href="/search/physics?searchtype=author&query=Pastori%2C+E">E. Pastori</a>, <a href="/search/physics?searchtype=author&query=Proto%2C+G">G. Proto</a>, <a href="/search/physics?searchtype=author&query=Aielli%2C+G">G. Aielli</a>, <a href="/search/physics?searchtype=author&query=Camarri%2C+P">P. Camarri</a>, <a href="/search/physics?searchtype=author&query=Di+Ciacco%2C+A">A. Di Ciacco</a>, <a href="/search/physics?searchtype=author&query=Di+Stante%2C+L">L. Di Stante</a>, <a href="/search/physics?searchtype=author&query=Santonico%2C+R">R. Santonico</a>, <a href="/search/physics?searchtype=author&query=Alberghi%2C+G">G. Alberghi</a>, <a href="/search/physics?searchtype=author&query=Boscherini%2C+D">D. Boscherini</a>, <a href="/search/physics?searchtype=author&query=Bruni%2C+A">A. Bruni</a>, <a href="/search/physics?searchtype=author&query=Massa%2C+L">L. Massa</a>, <a href="/search/physics?searchtype=author&query=Polini%2C+A">A. Polini</a>, <a href="/search/physics?searchtype=author&query=Romano%2C+M">M. Romano</a>, <a href="/search/physics?searchtype=author&query=Benussi%2C+L">L. Benussi</a>, <a href="/search/physics?searchtype=author&query=Bianco%2C+S">S. Bianco</a>, <a href="/search/physics?searchtype=author&query=Passamonti%2C+L">L. Passamonti</a>, <a href="/search/physics?searchtype=author&query=Piccolo%2C+D">D. Piccolo</a>, <a href="/search/physics?searchtype=author&query=Pierluigi%2C+D">D. Pierluigi</a>, <a href="/search/physics?searchtype=author&query=Ferrini%2C+A+R+M">A. Russo M. Ferrini</a>, <a href="/search/physics?searchtype=author&query=Saviano%2C+G">G. Saviano</a>, <a href="/search/physics?searchtype=author&query=Abbrescia%2C+M">M. Abbrescia</a>, <a href="/search/physics?searchtype=author&query=Congedo%2C+L">L. Congedo</a> , et al. (25 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="2209.02020v1-abstract-short" style="display: inline;"> The ALICE RPCs are operated with a mixture of 89.7% $C_{2}H_{2}F_{4}$, 10% i-$C_{4}H_{10}$ and 0.3% $SF_{6}$. $C_{2}H_{2}F_{4}$ and $SF_{6}$ are fluorinated greenhouse gases with a high Global Warming Potential (GWP). New European Union regulations have imposed a progressive phase-down of the production and usage of F-gases, aiming to cut down their emission by two thirds in 2030 with respect to 2… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.02020v1-abstract-full').style.display = 'inline'; document.getElementById('2209.02020v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2209.02020v1-abstract-full" style="display: none;"> The ALICE RPCs are operated with a mixture of 89.7% $C_{2}H_{2}F_{4}$, 10% i-$C_{4}H_{10}$ and 0.3% $SF_{6}$. $C_{2}H_{2}F_{4}$ and $SF_{6}$ are fluorinated greenhouse gases with a high Global Warming Potential (GWP). New European Union regulations have imposed a progressive phase-down of the production and usage of F-gases, aiming to cut down their emission by two thirds in 2030 with respect to 2014. Even though research activities are excluded from these regulations, the phase-down will inevitably increase their price and CERN is also aiming to cut down on its emissions. For these reasons it is crucial to find a more eco-friendly gas mixture for RPCs by the time of the LHC long shutdown 3, foreseen in 2026. Since $C_{2}H_{2}F_{4}$ is the main contributor to the mixture GWP, an extensive R&D process has started to replace it with tetrafluoropropene ($C_{3}H_{2}F_{4}$), due to its chemical similarity with $C_{2}H_{2}F_{4}$ and its low GWP (around 7). Preliminary tests with cosmic rays have shown promising results in terms of detector performance. The next step is to study the long-term behavior of RPCs operated with these new gas mixtures (aging studies). Since this is a subject of interest for all (and not only) the LHC experiments, a collaboration, ECOgas@GIF++, was setup to carry out joint studies. Among others, a small ALICE-like RPC was installed at the Gamma Irradiation Facility at CERN, where they are exposed to a strong radiation field, coming from a 12.5 TBq $^{137}$Cs source, which allows one to simulate many years of operation in a relatively short time. The facility also provides a muon beam at specific times of the year, which can be used to study the detector performance (e.g. efficiency and cluster size) during and after irradiation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.02020v1-abstract-full').style.display = 'none'; document.getElementById('2209.02020v1-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 September, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 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">Proceedings of the LHCp 2022 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/2201.08871">arXiv:2201.08871</a> <span> [<a href="https://arxiv.org/pdf/2201.08871">pdf</a>, <a href="https://arxiv.org/format/2201.08871">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"> The ALICE Experiment Upgrades </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">A. Ferretti</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="2201.08871v1-abstract-short" style="display: inline;"> The ALICE experiment profited of the Long Shutdown during 2019-2021 in order to expand its physics capabilities and fully profit from the increased LHC luminosity in Run 3. The Inner Tracking System has been replaced with a new silicon tracker based on MAPS technology, and a new tracking device has been added in front of the Muon Spectrometer to improve its vertexing capabilities. The wire chamber… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.08871v1-abstract-full').style.display = 'inline'; document.getElementById('2201.08871v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2201.08871v1-abstract-full" style="display: none;"> The ALICE experiment profited of the Long Shutdown during 2019-2021 in order to expand its physics capabilities and fully profit from the increased LHC luminosity in Run 3. The Inner Tracking System has been replaced with a new silicon tracker based on MAPS technology, and a new tracking device has been added in front of the Muon Spectrometer to improve its vertexing capabilities. The wire chambers for TPC readout have been replaced with new GEM detectors which will minimize ion backflow and allow for continuous data taking: moreover, a new detector array dedicated to fast triggering has been installed. On the software side, a new first pass reconstruction was added in order to handle and reduce the data flow and storage. These upgrades will be presented together with an outlook of the future ALICE upgrades in view of the LHC Run 4, which will include the replacement of the ITS inner tracking layers with upgraded silicon devices and a high-granularity electromagnetic and hadronic calorimeter in the forward direction (FOCAL) <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.08871v1-abstract-full').style.display = 'none'; document.getElementById('2201.08871v1-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> 21 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 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">4 pages, 1 Figure. Proceedings of 32nd Rencontres de Blois conference, October 17-22, 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/2112.08899">arXiv:2112.08899</a> <span> [<a href="https://arxiv.org/pdf/2112.08899">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> <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/10.1088/1748-0221/17/08/C08024">10.1088/1748-0221/17/08/C08024 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Studies on tetrafluoropropene-CO2 based gas mixtures for the Resistive Plate Chambers of the ALICE Muon IDentifier </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">Alessandro Ferretti</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="2112.08899v1-abstract-short" style="display: inline;"> Due to their simplicity and comparatively low cost Resistive Plate Chambers are gaseous detectors widely used in high-energy and cosmic rays physics when large detection areas are needed. However, the best gaseous mixtures are currently based on tetrafluoroethane, which has the undesirable characteristic of a large Global Warming Potential (GWP) of about 1400 and because of this, it is currently b… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.08899v1-abstract-full').style.display = 'inline'; document.getElementById('2112.08899v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2112.08899v1-abstract-full" style="display: none;"> Due to their simplicity and comparatively low cost Resistive Plate Chambers are gaseous detectors widely used in high-energy and cosmic rays physics when large detection areas are needed. However, the best gaseous mixtures are currently based on tetrafluoroethane, which has the undesirable characteristic of a large Global Warming Potential (GWP) of about 1400 and because of this, it is currently being phased out from industrial use. As a possible replacement, tetrafluoropropene (which has a GWP close to 1) has been taken into account. Since tetrafluoropropene is more electronegative than tetrafluoroethane, it has to be diluted with gases with a lower attachment coefficient in order to maintain the operating voltage close to 10 kV. One of the main candidates for this role is carbon dioxide. In order to ascertain the feasibility and the performance of tetrafluoropropene-CO2 based mixtures, an R&D program is being carried out in the ALICE collaboration, which employs an array of 72 Bakelite RPCs (Muon Identifier, MID) to identify muons. Different proportions of tetrafluoropropene and CO2, with the addition of small quantities of isobutane and sulphur hexafluoride, have been tested with 50x50 cm2 RPC prototypes with 2 mm wide gas gap and 2 mm thick Bakelite electrodes. In the presentation, results from tests with cosmic rays will be presented, together with data concerning the current drawn by a RPC exposed to the gamma-ray flux of the Gamma Irradiation Facility (GIF) at CERN. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.08899v1-abstract-full').style.display = 'none'; document.getElementById('2112.08899v1-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 December, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">4 pages, 3 figures, proceeding of the 12th International Conference on Position Sensitive Detectors</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2104.10502">arXiv:2104.10502</a> <span> [<a href="https://arxiv.org/pdf/2104.10502">pdf</a>, <a href="https://arxiv.org/format/2104.10502">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-ph</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/10.1063/5.0005082">10.1063/5.0005082 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quantum ESPRESSO toward the exascale </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Giannozzi%2C+P">Paolo Giannozzi</a>, <a href="/search/physics?searchtype=author&query=Baseggio%2C+O">Oscar Baseggio</a>, <a href="/search/physics?searchtype=author&query=Bonf%C3%A0%2C+P">Pietro Bonf脿</a>, <a href="/search/physics?searchtype=author&query=Brunato%2C+D">Davide Brunato</a>, <a href="/search/physics?searchtype=author&query=Car%2C+R">Roberto Car</a>, <a href="/search/physics?searchtype=author&query=Carnimeo%2C+I">Ivan Carnimeo</a>, <a href="/search/physics?searchtype=author&query=Cavazzoni%2C+C">Carlo Cavazzoni</a>, <a href="/search/physics?searchtype=author&query=de+Gironcoli%2C+S">Stefano de Gironcoli</a>, <a href="/search/physics?searchtype=author&query=Delugas%2C+P">Pietro Delugas</a>, <a href="/search/physics?searchtype=author&query=Ruffino%2C+F+F">Fabrizio Ferrari Ruffino</a>, <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">Andrea Ferretti</a>, <a href="/search/physics?searchtype=author&query=Marzari%2C+N">Nicola Marzari</a>, <a href="/search/physics?searchtype=author&query=Timrov%2C+I">Iurii Timrov</a>, <a href="/search/physics?searchtype=author&query=Urru%2C+A">Andrea Urru</a>, <a href="/search/physics?searchtype=author&query=Baroni%2C+S">Stefano Baroni</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="2104.10502v2-abstract-short" style="display: inline;"> Quantum ESPRESSO is an open-source distribution of computer codes for quantum-mechanical materials modeling, based on density-functional theory, pseudopotentials, and plane waves, and renowned for its performance on a wide range of hardware architectures, from laptops to massively parallel computers, as well as for the breadth of its applications. In this paper we present a motivation and brief re… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.10502v2-abstract-full').style.display = 'inline'; document.getElementById('2104.10502v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2104.10502v2-abstract-full" style="display: none;"> Quantum ESPRESSO is an open-source distribution of computer codes for quantum-mechanical materials modeling, based on density-functional theory, pseudopotentials, and plane waves, and renowned for its performance on a wide range of hardware architectures, from laptops to massively parallel computers, as well as for the breadth of its applications. In this paper we present a motivation and brief review of the ongoing effort to port Quantum ESPRESSO onto heterogeneous architectures based on hardware accelerators, which will overcome the energy constraints that are currently hindering the way towards exascale computing. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.10502v2-abstract-full').style.display = 'none'; document.getElementById('2104.10502v2-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 April, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 April, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Chem. Phys. 152, 154105 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2103.08643">arXiv:2103.08643</a> <span> [<a href="https://arxiv.org/pdf/2103.08643">pdf</a>, <a href="https://arxiv.org/ps/2103.08643">ps</a>, <a href="https://arxiv.org/format/2103.08643">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</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"> Electron Collision Cross Sections in Tetrafluoropropene HFO1234ze(E) for Gas Mixtures in Resistive Plate Chambers </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Bianchi%2C+A">Antonio Bianchi</a>, <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">Alessandro Ferretti</a>, <a href="/search/physics?searchtype=author&query=Gagliardi%2C+M">Martino Gagliardi</a>, <a href="/search/physics?searchtype=author&query=Vercellin%2C+E">Ermanno Vercellin</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="2103.08643v2-abstract-short" style="display: inline;"> In recent years, there has been growing interest in tetrafluoropropene HFO1234ze(E) (C$_{3}$H$_{2}$F$_{4}$) for Resistive Plate Chambers (RPCs). This novel gas is considered a promising alternative to the standard mixtures currently used in RPCs, thanks to its low global warming potential. The knowledge of electron collision cross sections in C$_{3}$H$_{2}$F$_{4}$ enables reliable predictions of e… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.08643v2-abstract-full').style.display = 'inline'; document.getElementById('2103.08643v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2103.08643v2-abstract-full" style="display: none;"> In recent years, there has been growing interest in tetrafluoropropene HFO1234ze(E) (C$_{3}$H$_{2}$F$_{4}$) for Resistive Plate Chambers (RPCs). This novel gas is considered a promising alternative to the standard mixtures currently used in RPCs, thanks to its low global warming potential. The knowledge of electron collision cross sections in C$_{3}$H$_{2}$F$_{4}$ enables reliable predictions of electron transport coefficients and reaction rates in C$_{3}$H$_{2}$F$_{4}$-based gas mixtures. This allows for optimizing the C$_{3}$H$_{2}$F$_{4}$-based gas mixtures to achieve the desired performance in RPCs. From measurements of electron transport coefficients and reaction rates, a complete set of scattering cross sections for electrons in C$_{3}$H$_{2}$F$_{4}$ has been derived. Validation of the electron collision cross sections is achieved through systematic comparisons of electron swarm parameters with experimental data in both pure C$_{3}$H$_{2}$F$_{4}$ and C$_{3}$H$_{2}$F$_{4}$/CO$_{2}$ gas mixtures. Given the influence of electron attachment in C$_{3}$H$_{2}$F$_{4}$ by the gas density, this work also includes precise calculations of the critical electric field strength in such mixtures. This set of cross sections has been further utilized to compute the effective ionization Townsend coefficient in gas mixtures containing C$_{3}$H$_{2}$F$_{4}$, potentially applicable for RPCs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.08643v2-abstract-full').style.display = 'none'; document.getElementById('2103.08643v2-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 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 March, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">Added section "Tetrafluoropropene-based Gas Mixtures for Resistive Plate Chambers"</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2009.08094">arXiv:2009.08094</a> <span> [<a href="https://arxiv.org/pdf/2009.08094">pdf</a>, <a href="https://arxiv.org/format/2009.08094">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"> Detection & imaging with Leak Microstructures </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Lombardi%2C+M">M. Lombardi</a>, <a href="/search/physics?searchtype=author&query=Balbinot%2C+G">G. Balbinot</a>, <a href="/search/physics?searchtype=author&query=Battistella%2C+A">A. Battistella</a>, <a href="/search/physics?searchtype=author&query=Colautti%2C+P">P. Colautti</a>, <a href="/search/physics?searchtype=author&query=Conte%2C+V">V. Conte</a>, <a href="/search/physics?searchtype=author&query=De+Nardo%2C+L">L. De Nardo</a>, <a href="/search/physics?searchtype=author&query=Galeazzi%2C+G">G. Galeazzi</a>, <a href="/search/physics?searchtype=author&query=Prete%2C+G">G. Prete</a>, <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">A. Ferretti</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="2009.08094v1-abstract-short" style="display: inline;"> Results obtained with a new very compact detector for imaging with a matrix of Leak Microstructures (LM)are reported. Spatial linearity and spatial resolution obtained by scanning as well as the detection of alpha particles with 100% efficiency, when compared with a silicon detector, are stressed. Preliminary results recently obtained in detecting single electrons emitted by heated filament (Ec <… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.08094v1-abstract-full').style.display = 'inline'; document.getElementById('2009.08094v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2009.08094v1-abstract-full" style="display: none;"> Results obtained with a new very compact detector for imaging with a matrix of Leak Microstructures (LM)are reported. Spatial linearity and spatial resolution obtained by scanning as well as the detection of alpha particles with 100% efficiency, when compared with a silicon detector, are stressed. Preliminary results recently obtained in detecting single electrons emitted by heated filament (Ec < 1 eV) at 1-3 mbar of propane are reported. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.08094v1-abstract-full').style.display = 'none'; document.getElementById('2009.08094v1-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 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 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">5 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/2005.01476">arXiv:2005.01476</a> <span> [<a href="https://arxiv.org/pdf/2005.01476">pdf</a>, <a href="https://arxiv.org/format/2005.01476">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"> Environment-friendly gas mixtures for Resistive Plate Chambers: an experimental and simulation study </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Bianchi%2C+A">A. Bianchi</a>, <a href="/search/physics?searchtype=author&query=Delsanto%2C+S">S. Delsanto</a>, <a href="/search/physics?searchtype=author&query=Dupieux%2C+P">P. Dupieux</a>, <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">A. Ferretti</a>, <a href="/search/physics?searchtype=author&query=Gagliardi%2C+M">M. Gagliardi</a>, <a href="/search/physics?searchtype=author&query=Joly%2C+B">B. Joly</a>, <a href="/search/physics?searchtype=author&query=Manen%2C+S+P">S. P. Manen</a>, <a href="/search/physics?searchtype=author&query=Marchisone%2C+M">M. Marchisone</a>, <a href="/search/physics?searchtype=author&query=Micheletti%2C+L">L. Micheletti</a>, <a href="/search/physics?searchtype=author&query=Quaglia%2C+L">L. Quaglia</a>, <a href="/search/physics?searchtype=author&query=Rosano%2C+A">A. Rosano</a>, <a href="/search/physics?searchtype=author&query=Terlizzi%2C+L">L. Terlizzi</a>, <a href="/search/physics?searchtype=author&query=Vercellin%2C+E">E. Vercellin</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="2005.01476v1-abstract-short" style="display: inline;"> Resistive Plate Chambers (RPC) have shown stable operation at the Large Hadron Collider and satisfactory efficiency for the entire Run 1 (2010-2013) and Run 2 (2015-2018) with C$_{2}$H$_{2}$F$_{4}$-based gas mixtures and the addition of SF$_{6}$ and i-C$_{4}$H$_{10}$. Since its global warming potential (GWP) is high, C$_{2}$H$_{2}$F$_{4}$ is phasing out of production due to recent European Union r… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.01476v1-abstract-full').style.display = 'inline'; document.getElementById('2005.01476v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2005.01476v1-abstract-full" style="display: none;"> Resistive Plate Chambers (RPC) have shown stable operation at the Large Hadron Collider and satisfactory efficiency for the entire Run 1 (2010-2013) and Run 2 (2015-2018) with C$_{2}$H$_{2}$F$_{4}$-based gas mixtures and the addition of SF$_{6}$ and i-C$_{4}$H$_{10}$. Since its global warming potential (GWP) is high, C$_{2}$H$_{2}$F$_{4}$ is phasing out of production due to recent European Union regulations and as a result its cost is progressively increasing. Therefore, finding a new RPC gas mixture with a low GWP has become extremely important. This contribution describes the simulation of the RPC efficiency with tetrafluoropropene C$_{3}$H$_{2}$F$_{4}$ (HFO1234ze), a hydrofluoroolefin with very low GWP. Simulation results are systematically compared with measurements of RPC efficiency in C$_{3}$H$_{2}$F$_{4}$-based gas mixtures with the addition of different combinations of Ar, He, CO$_{2}$, O$_{2}$ and i-C$_{4}$H$_{10}$ in various concentrations. This simulation allows the study of the interplay between C$_{3}$H$_{2}$F$_{4}$ and the other gas components in the mixture as well as may allow the identification of the most promising environment-friendly gas mixtures with C$_{3}$H$_{2}$F$_{4}$ for RPCs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.01476v1-abstract-full').style.display = 'none'; document.getElementById('2005.01476v1-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 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">15th Workshop on Resistive Plate Chambers and Related Detectors (RPC 2020)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2005.00286">arXiv:2005.00286</a> <span> [<a href="https://arxiv.org/pdf/2005.00286">pdf</a>, <a href="https://arxiv.org/format/2005.00286">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/10.1088/1748-0221/16/04/C04002">10.1088/1748-0221/16/04/C04002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Performance and aging studies for the ALICE muon RPCs </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Quaglia%2C+L">Luca Quaglia</a>, <a href="/search/physics?searchtype=author&query=Bianchi%2C+A">Antonio Bianchi</a>, <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">Alessandro Ferretti</a>, <a href="/search/physics?searchtype=author&query=Gagliardi%2C+M">Martino Gagliardi</a>, <a href="/search/physics?searchtype=author&query=Stocco%2C+D">Diego Stocco</a>, <a href="/search/physics?searchtype=author&query=Guida%2C+R">Roberto Guida</a>, <a href="/search/physics?searchtype=author&query=Mandelli%2C+B">Beatrice Mandelli</a>, <a href="/search/physics?searchtype=author&query=Alvigini%2C+L">Laura Alvigini</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="2005.00286v3-abstract-short" style="display: inline;"> The ALICE muon trigger (MTR) system consists of 72 Resistive Plate Chamber (RPC) detectors arranged in two stations, each composed of two planes with 18 RPCs per plane. The detectors are operated in maxi-avalanche mode using a mixture of 89.7% C$_2$H$_2$F$_4$, 10% i-C$_4$H$_{10}$ and 0.3% SF$_6$. A number of detector performance indicators, such as efficiency and dark current, have been monitored… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.00286v3-abstract-full').style.display = 'inline'; document.getElementById('2005.00286v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2005.00286v3-abstract-full" style="display: none;"> The ALICE muon trigger (MTR) system consists of 72 Resistive Plate Chamber (RPC) detectors arranged in two stations, each composed of two planes with 18 RPCs per plane. The detectors are operated in maxi-avalanche mode using a mixture of 89.7% C$_2$H$_2$F$_4$, 10% i-C$_4$H$_{10}$ and 0.3% SF$_6$. A number of detector performance indicators, such as efficiency and dark current, have been monitored over time throughout the LHC Run2 (2015-18). While the efficiency showed very good stability, a steady increase in the absorbed dark current was observed. Since the end of 2018, the LHC has entered a phase of long shutdown, during which the ALICE experiment will be upgraded to cope with the next phase of data taking, expected in 2021. The MTR is undergoing a major upgrade of the front-end and readout electronics, and will change its functionalities, becoming a Muon Identifier. Only the replacement of the most irradiated RPCs is planned during the upgrade. It is therefore important to perform dedicated studies to gain further insights into the status of the detector. In particular, two RPCs were flushed with pure Ar gas for a prolonged period of time and a plasma was created by fully ionizing the gas. The output gas was analyzed using a Gas Chromatograph combined with a Mass Spectrometer and the possible presence of fluorinated compounds originating from the interaction of the plasma with the inner surfaces of the detector has been assessed using an Ion-Selective Electrode station. This contribution will include a detailed review of the ALICE muon RPC performance at the LHC. The procedure and results of the argon plasma test, described above, are also discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.00286v3-abstract-full').style.display = 'none'; document.getElementById('2005.00286v3-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 January, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 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">Proceedings of the 15th Workshop on Resistive Plate Chambers and Related Detectors (RPC2020), 10-14 February 2020, University of Roma Tor Vergata, 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/2001.10446">arXiv:2001.10446</a> <span> [<a href="https://arxiv.org/pdf/2001.10446">pdf</a>, <a href="https://arxiv.org/format/2001.10446">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/10.1088/1748-0221/15/04/C04039">10.1088/1748-0221/15/04/C04039 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Studies on tetrafluoropropene-based gas mixtures with low environmental impact for Resistive Plate Chambers </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Bianchi%2C+A">A. Bianchi</a>, <a href="/search/physics?searchtype=author&query=Delsanto%2C+S">S. Delsanto</a>, <a href="/search/physics?searchtype=author&query=Dupieux%2C+P">P. Dupieux</a>, <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">A. Ferretti</a>, <a href="/search/physics?searchtype=author&query=Gagliardi%2C+M">M. Gagliardi</a>, <a href="/search/physics?searchtype=author&query=Joly%2C+B">B. Joly</a>, <a href="/search/physics?searchtype=author&query=Manen%2C+S+P">S. P. Manen</a>, <a href="/search/physics?searchtype=author&query=Marchisone%2C+M">M. Marchisone</a>, <a href="/search/physics?searchtype=author&query=Micheletti%2C+L">L. Micheletti</a>, <a href="/search/physics?searchtype=author&query=Rosano%2C+A">A. Rosano</a>, <a href="/search/physics?searchtype=author&query=Vercellin%2C+E">E. Vercellin</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="2001.10446v1-abstract-short" style="display: inline;"> Gaseous detectors are widely used in high-energy physics experiments, and in particular at the CERN Large Hadron Collider (LHC), to provide tracking and triggering over large volumes. It has been recently estimated that Resistive Plate Chambers (RPC), used for muon detection, have the highest contribution on the overall greenhouse gas (GHG) emissions at the LHC experiments. Gas mixtures for RPCs… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2001.10446v1-abstract-full').style.display = 'inline'; document.getElementById('2001.10446v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2001.10446v1-abstract-full" style="display: none;"> Gaseous detectors are widely used in high-energy physics experiments, and in particular at the CERN Large Hadron Collider (LHC), to provide tracking and triggering over large volumes. It has been recently estimated that Resistive Plate Chambers (RPC), used for muon detection, have the highest contribution on the overall greenhouse gas (GHG) emissions at the LHC experiments. Gas mixtures for RPCs are mainly made of C$_{2}$H$_{2}$F$_{4}$, which is a greenhouse gas with a high environmental impact in the atmosphere. C$_{2}$H$_{2}$F$_{4}$ is already phasing out of production, due to recent European Union (EU) regulations, and its cost is expected to increase in the near future. Therefore, finding alternative gas mixtures made of gas components with a low Global Warming Potential (GWP) has become extremely important for limiting the GHG emissions as well as for economic reasons. The novel hydrofluoroolefins are likely appropriate candidates to replace C$_{2}$H$_{2}$F$_{4}$ due to their similar chemical structures. This study is focused on the characterization of innovative gas mixtures with tetrafluoropropene HFO1234ze(E) (C$_{3}$H$_{2}$F$_{4}$) that is one of the most eco-friendly hydrofluoroolefins, thanks to its very low GWP. HFO1234ze(E)-based gas mixtures with the addition of Ar, N$_{2}$, O$_{2}$ and CO$_{2}$ are extensively discussed in this paper as well as the role of i-C$_{4}$H$_{10}$ and SF$_{6}$ in such mixtures. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2001.10446v1-abstract-full').style.display = 'none'; document.getElementById('2001.10446v1-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 January, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 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">15th Topical Seminar on Innovative Particle and Radiation Detectors (IPRD19)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1907.03268">arXiv:1907.03268</a> <span> [<a href="https://arxiv.org/pdf/1907.03268">pdf</a>, <a href="https://arxiv.org/format/1907.03268">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/10.1088/1748-0221/14/11/P11014">10.1088/1748-0221/14/11/P11014 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Characterization of tetrafluoropropene-based gas mixtures for the Resistive Plate Chambers of the ALICE muon spectrometer </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Bianchi%2C+A">A. Bianchi</a>, <a href="/search/physics?searchtype=author&query=Delsanto%2C+S">S. Delsanto</a>, <a href="/search/physics?searchtype=author&query=Dupieux%2C+P">P. Dupieux</a>, <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">A. Ferretti</a>, <a href="/search/physics?searchtype=author&query=Gagliardi%2C+M">M. Gagliardi</a>, <a href="/search/physics?searchtype=author&query=Joly%2C+B">B. Joly</a>, <a href="/search/physics?searchtype=author&query=Manen%2C+S+P">S. P. Manen</a>, <a href="/search/physics?searchtype=author&query=Marchisone%2C+M">M. Marchisone</a>, <a href="/search/physics?searchtype=author&query=Micheletti%2C+L">L. Micheletti</a>, <a href="/search/physics?searchtype=author&query=Rosano%2C+A">A. Rosano</a>, <a href="/search/physics?searchtype=author&query=Vercellin%2C+E">E. Vercellin</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="1907.03268v1-abstract-short" style="display: inline;"> The muon identification system of the ALICE experiment at the CERN LHC is based on Resistive Plate Chamber (RPC) detectors. These RPCs are operated in the so-called maxi-avalanche mode with a gas mixture made of tetrafluoroethane (C$_{2}$H$_{2}$F$_{4}$), sulfur hexafluoride (SF$_{6}$) and isobutane (i-C$_{4}$H$_{10}$). All of these components are greenhouse gases: in particular, the first two gase… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.03268v1-abstract-full').style.display = 'inline'; document.getElementById('1907.03268v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1907.03268v1-abstract-full" style="display: none;"> The muon identification system of the ALICE experiment at the CERN LHC is based on Resistive Plate Chamber (RPC) detectors. These RPCs are operated in the so-called maxi-avalanche mode with a gas mixture made of tetrafluoroethane (C$_{2}$H$_{2}$F$_{4}$), sulfur hexafluoride (SF$_{6}$) and isobutane (i-C$_{4}$H$_{10}$). All of these components are greenhouse gases: in particular, the first two gases are already phasing out of production, due to recent European Union regulations, and their cost is progressively increasing. Therefore, finding a new eco-friendly gas mixture has become extremely important in order to reduce the impact of the RPC operation on the environment, and for economic reasons. Due to the similar chemical structure, hydrofluoroolefins appear appropriate candidates to replace C$_{2}$H$_{2}$F$_{4}$ thanks to their very low GWPs, especially tetrafluoropropene (C$_{3}$H$_{2}$F$_{4}$) with the trade name HFO1234ze. In order to identify an eco-friendly gas mixture fulfilling the requirements for operation in the ALICE environment in the coming years, a dedicated experimental set-up has been built to carry out R&D studies on promising gas mixtures. Measurements have been performed with a small-size RPC equipped with the front-end electronics, providing signal amplification, developed for ALICE operation at high luminosity after the LHC Long Shutdown 2. HFO1234ze-based mixtures with the addition of CO$_{2}$ are discussed in this paper as well as the role of i-C$_{4}$H$_{10}$ and SF$_{6}$ as quenchers in such mixtures. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.03268v1-abstract-full').style.display = 'none'; document.getElementById('1907.03268v1-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 July, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1902.03837">arXiv:1902.03837</a> <span> [<a href="https://arxiv.org/pdf/1902.03837">pdf</a>, <a href="https://arxiv.org/format/1902.03837">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-ph</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/10.1088/1361-648X/ab15d0">10.1088/1361-648X/ab15d0 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Many-body perturbation theory calculations using the yambo code </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Sangalli%2C+D">D. Sangalli</a>, <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">A. Ferretti</a>, <a href="/search/physics?searchtype=author&query=Miranda%2C+H">H. Miranda</a>, <a href="/search/physics?searchtype=author&query=Attaccalite%2C+C">C. Attaccalite</a>, <a href="/search/physics?searchtype=author&query=Marri%2C+I">I. Marri</a>, <a href="/search/physics?searchtype=author&query=Cannuccia%2C+E">E. Cannuccia</a>, <a href="/search/physics?searchtype=author&query=Melo%2C+P">P. Melo</a>, <a href="/search/physics?searchtype=author&query=Marsili%2C+M">M. Marsili</a>, <a href="/search/physics?searchtype=author&query=Paleari%2C+F">F. Paleari</a>, <a href="/search/physics?searchtype=author&query=Marrazzo%2C+A">A. Marrazzo</a>, <a href="/search/physics?searchtype=author&query=Prandini%2C+G">G. Prandini</a>, <a href="/search/physics?searchtype=author&query=Bonf%C3%A0%2C+P">P. Bonf脿</a>, <a href="/search/physics?searchtype=author&query=Atambo%2C+M+O">M. O. Atambo</a>, <a href="/search/physics?searchtype=author&query=Affinito%2C+F">F. Affinito</a>, <a href="/search/physics?searchtype=author&query=Palummo%2C+M">M. Palummo</a>, <a href="/search/physics?searchtype=author&query=Molina-S%C3%A1nchez%2C+A">A. Molina-S谩nchez</a>, <a href="/search/physics?searchtype=author&query=Hogan%2C+C">C. Hogan</a>, <a href="/search/physics?searchtype=author&query=Gr%C3%BCning%2C+M">M. Gr眉ning</a>, <a href="/search/physics?searchtype=author&query=Varsano%2C+D">D. Varsano</a>, <a href="/search/physics?searchtype=author&query=Marini%2C+A">A. Marini</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="1902.03837v2-abstract-short" style="display: inline;"> yambo is an open source project aimed at studying excited state properties of condensed matter systems from first principles using many-body methods. As input, yambo requires ground state electronic structure data as computed by density functional theory codes such as quantum-espresso and abinit. yambo's capabilities include the calculation of linear response quantities (both independent-particle… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1902.03837v2-abstract-full').style.display = 'inline'; document.getElementById('1902.03837v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1902.03837v2-abstract-full" style="display: none;"> yambo is an open source project aimed at studying excited state properties of condensed matter systems from first principles using many-body methods. As input, yambo requires ground state electronic structure data as computed by density functional theory codes such as quantum-espresso and abinit. yambo's capabilities include the calculation of linear response quantities (both independent-particle and including electron-hole interactions), quasi-particle corrections based on the GW formalism, optical absorption, and other spectroscopic quantities. Here we describe recent developments ranging from the inclusion of important but oft-neglected physical effects such as electron-phonon interactions to the implementation of a real-time propagation scheme for simulating linear and non-linear optical properties. Improvements to numerical algorithms and the user interface are outlined. Particular emphasis is given to the new and efficient parallel structure that makes it possible to exploit modern high performance computing architectures. Finally, we demonstrate the possibility to automate workflows by interfacing with the yambopy and AiiDA software tools. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1902.03837v2-abstract-full').style.display = 'none'; document.getElementById('1902.03837v2-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 June, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 February, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Journal of Physics: Condensed Matter, Volume 31, Number 32 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1810.02111">arXiv:1810.02111</a> <span> [<a href="https://arxiv.org/pdf/1810.02111">pdf</a>, <a href="https://arxiv.org/format/1810.02111">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</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/10.1021/acs.jctc.8b00976">10.1021/acs.jctc.8b00976 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Koopmans-compliant functionals and potentials and their application to the GW100 test-set </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Colonna%2C+N">Nicola Colonna</a>, <a href="/search/physics?searchtype=author&query=Nguyen%2C+N+L">Ngoch Linh Nguyen</a>, <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">Andrea Ferretti</a>, <a href="/search/physics?searchtype=author&query=Marzari%2C+N">Nicola Marzari</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="1810.02111v1-abstract-short" style="display: inline;"> Koopmans-compliant (KC) functionals have been shown to provide accurate spectral properties through a generalized condition of piece-wise linearity of the total energy as a function of the fractional addition/removal of an electron to/from any orbital. We analyze the performance of different KC functionals on the GW100 test-set, comparing the ionization potentials (as opposite of the energy of the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1810.02111v1-abstract-full').style.display = 'inline'; document.getElementById('1810.02111v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1810.02111v1-abstract-full" style="display: none;"> Koopmans-compliant (KC) functionals have been shown to provide accurate spectral properties through a generalized condition of piece-wise linearity of the total energy as a function of the fractional addition/removal of an electron to/from any orbital. We analyze the performance of different KC functionals on the GW100 test-set, comparing the ionization potentials (as opposite of the energy of the highest occupied orbital) of these 100 molecules to those obtained from CCSD(T) total energy differences, and experimental results, finding excellent agreement with a mean absolute error of 0.20 eV for the KIPZ functional, that is state-of-the-art for both DFT-based calculations and many-body perturbation theory. We highlight similarities and differences between KC functionals and other electronic-structure approaches, such as dielectric-dependent hybrid functionals and G$_0$W$_0$, both from a theoretical and from a practical point of view, arguing that Koopmans-compliant potentials can be considered as a local and orbital-dependent counterpart to the electronic GW self-energy, albeit already including approximate vertex corrections. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1810.02111v1-abstract-full').style.display = 'none'; document.getElementById('1810.02111v1-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 October, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Chem. Theory Comput. 15 (3) , 1905-1914 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1806.05879">arXiv:1806.05879</a> <span> [<a href="https://arxiv.org/pdf/1806.05879">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> <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/10.1088/1748-0221/14/06/C06011">10.1088/1748-0221/14/06/C06011 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The upgrade of the RPC-based ALICE Muon Trigger </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">A. Ferretti</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="1806.05879v1-abstract-short" style="display: inline;"> The ALICE Muon Trigger is currently yielded by a detector currently composed of 72 Bakelite single-gap Resistive Plate Chambers operated in maxi-avalanche mode, arranged in four 5.5x6.5 m2 detection planes. In order to meet the requirements posed by the forthcoming LHC high luminosity runs starting from 2021 onwards, in which ALICE will be read out in continuous mode, the Muon Trigger will become… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.05879v1-abstract-full').style.display = 'inline'; document.getElementById('1806.05879v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1806.05879v1-abstract-full" style="display: none;"> The ALICE Muon Trigger is currently yielded by a detector currently composed of 72 Bakelite single-gap Resistive Plate Chambers operated in maxi-avalanche mode, arranged in four 5.5x6.5 m2 detection planes. In order to meet the requirements posed by the forthcoming LHC high luminosity runs starting from 2021 onwards, in which ALICE will be read out in continuous mode, the Muon Trigger will become a Muon Identifier and will undergo a major upgrade. In the current setup, signals from about 21k strips are discriminated by 2400 non-amplified Front End (FEE) cards, whose thresholds are provided by external analog voltages (one for each chamber side). All these cards will be replaced with discriminators equipped with a pre-amplification stage which will allow a reduction in the operating high voltage of the detectors, thus prolonging their lifetime. Furthermore, their reference thresholds will be passed via wireless (and I2C chained per chamber side) allowing the tuning of the values at the single card level. Moreover, the 24 most exposed chambers will be replaced with new ones, equipped with high-quality (i.e. smoother surface) Bakelite laminates. The tests performed on the new FEE cards, used both in a test bench and on detectors, and on the new RPC chambers (with cosmic rays) are reported. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.05879v1-abstract-full').style.display = 'none'; document.getElementById('1806.05879v1-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 June, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">Proceeding of the 14th Workshop on Resistive Plate Chambers and Related Detectors 19-23 February 2018 Puerto Vallarta, Jalisco State, Mexico</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1711.04485">arXiv:1711.04485</a> <span> [<a href="https://arxiv.org/pdf/1711.04485">pdf</a>, <a href="https://arxiv.org/format/1711.04485">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</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/10.1021/acs.jctc.7b01116">10.1021/acs.jctc.7b01116 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Screening in orbital-density-dependent functionals </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Colonna%2C+N">Nicola Colonna</a>, <a href="/search/physics?searchtype=author&query=Nguyen%2C+N+L">Ngoc Linh Nguyen</a>, <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">Andrea Ferretti</a>, <a href="/search/physics?searchtype=author&query=Marzari%2C+N">Nicola Marzari</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="1711.04485v1-abstract-short" style="display: inline;"> Electronic-structure functionals that include screening effects, such as Hubbard or Koopmans' functionals, require to describe the response of a system to the fractional addition or removal of an electron from an orbital or a manifold. Here, we present a general method to incorporate screening based on linear-response theory, and we apply it to the case of the orbital-by-orbital screening of Koopm… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.04485v1-abstract-full').style.display = 'inline'; document.getElementById('1711.04485v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.04485v1-abstract-full" style="display: none;"> Electronic-structure functionals that include screening effects, such as Hubbard or Koopmans' functionals, require to describe the response of a system to the fractional addition or removal of an electron from an orbital or a manifold. Here, we present a general method to incorporate screening based on linear-response theory, and we apply it to the case of the orbital-by-orbital screening of Koopmans' functionals. We illustrate the importance of such generalization when dealing with challenging systems containing orbitals with very different chemical character, also highlighting the simple dependence of the screening on the localization of the orbitals. We choose a set of 46 transition-metal complexes for which experimental data and accurate many-body perturbation theory calculations are available. When compared to experiment, results for ionization potentials show a very good performance with a mean absolute error of $~0.2$ eV, comparable to the most accurate many-body perturbation theory approaches. These results reiterate the role of Koopmans' compliant functionals as simple and accurate quasiparticle approximations to the exact spectral functional, bypassing diagrammatic expansions and relying only on the physics of the local density or generalized-gradient approximation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.04485v1-abstract-full').style.display = 'none'; document.getElementById('1711.04485v1-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> 13 November, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Chem. Theory Comput. 14 (5), 2549 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1606.03227">arXiv:1606.03227</a> <span> [<a href="https://arxiv.org/pdf/1606.03227">pdf</a>, <a href="https://arxiv.org/format/1606.03227">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> </div> </div> <p class="title is-5 mathjax"> First-principles photoemission spectroscopy of DNA and RNA nucleobases from Koopmans-compliant functionals </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Nguyen%2C+N+L">Ngoc Linh Nguyen</a>, <a href="/search/physics?searchtype=author&query=Borghi%2C+G">Giovanni Borghi</a>, <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">Andrea Ferretti</a>, <a href="/search/physics?searchtype=author&query=Marzari%2C+N">Nicola Marzari</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="1606.03227v1-abstract-short" style="display: inline;"> The need to interpret ultraviolet photoemission data strongly motivates the refinement of first-principles techniques able to accurately predict spectral properties. In this work we employ Koopmans-compliant functionals, constructed to enforce piecewise linearity in approximate density functionals, to calculate the structural and electronic properties of DNA and RNA nucleobases. Our results show t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1606.03227v1-abstract-full').style.display = 'inline'; document.getElementById('1606.03227v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1606.03227v1-abstract-full" style="display: none;"> The need to interpret ultraviolet photoemission data strongly motivates the refinement of first-principles techniques able to accurately predict spectral properties. In this work we employ Koopmans-compliant functionals, constructed to enforce piecewise linearity in approximate density functionals, to calculate the structural and electronic properties of DNA and RNA nucleobases. Our results show that not only ionization potentials and electron affinities are accurately predicted with mean absolute errors < 0.1 eV, but also that calculated photoemission spectra are in excellent agreement with experimental ultraviolet photoemission spectra. In particular, the role and contribution of different tautomers to the photoemission spectra are highlighted and discussed in detail. The structural properties of nucleobases are also investigated, showing an improved description with respect to local and semilocal density-functional theory. Methodologically, our results further consolidate the role of Koopmans-compliant functionals in providing, through orbital-density-dependent potentials, accurate electronic and spectral properties. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1606.03227v1-abstract-full').style.display = 'none'; document.getElementById('1606.03227v1-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 June, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">13 pages, 8 figures, 1 Supporting Information</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1405.4635">arXiv:1405.4635</a> <span> [<a href="https://arxiv.org/pdf/1405.4635">pdf</a>, <a href="https://arxiv.org/format/1405.4635">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</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/10.1103/PhysRevB.90.075135">10.1103/PhysRevB.90.075135 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Koopmans-compliant functionals and their performance against reference molecular data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Borghi%2C+G">Giovanni Borghi</a>, <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">Andrea Ferretti</a>, <a href="/search/physics?searchtype=author&query=Nguyen%2C+N+L">Ngoc Linh Nguyen</a>, <a href="/search/physics?searchtype=author&query=Dabo%2C+I">Ismaila Dabo</a>, <a href="/search/physics?searchtype=author&query=Marzari%2C+N">Nicola Marzari</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="1405.4635v2-abstract-short" style="display: inline;"> Koopmans-compliant functionals emerge naturally from extending the constraint of piecewise linearity of the total energy as a function of the number of electrons to each fractional orbital occupation. When applied to approximate density-functional theory, these corrections give rise to orbital-density-dependent functionals and potentials. We show that the simplest implementations of Koopmans' comp… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1405.4635v2-abstract-full').style.display = 'inline'; document.getElementById('1405.4635v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1405.4635v2-abstract-full" style="display: none;"> Koopmans-compliant functionals emerge naturally from extending the constraint of piecewise linearity of the total energy as a function of the number of electrons to each fractional orbital occupation. When applied to approximate density-functional theory, these corrections give rise to orbital-density-dependent functionals and potentials. We show that the simplest implementations of Koopmans' compliance provide accurate estimates for the quasiparticle excitations and leave the total energy functional almost or exactly intact, i.e., they describe correctly electron removals or additions, but do not necessarily alter the electronic charge density distribution within the system. Additional functionals can then be constructed that modify the potential energy surface, including e.g. Perdew-Zunger corrections. These functionals become exactly one-electron self-interaction free and, as all Koopmans-compliant functionals, are approximately many-electron self-interaction free. We discuss in detail these different formulations, and provide extensive benchmarks for the 55 molecules in the reference G2-1 set, using Koopmans-compliant functionals constructed from local-density or generalized-gradient approximations. In all cases we find excellent performance in the electronic properties, comparable or improved with respect to that of many-body perturbation theories, such as G$_0$W$_0$ and self-consistent GW, at a fraction of the cost and in a variational framework that also delivers energy derivatives. Structural properties and atomization energies preserve or slightly improve the accuracy of the underlying density-functional approximations (Note: Supplemental Material is included in the source). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1405.4635v2-abstract-full').style.display = 'none'; document.getElementById('1405.4635v2-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 August, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 May, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2014. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1205.3282">arXiv:1205.3282</a> <span> [<a href="https://arxiv.org/pdf/1205.3282">pdf</a>, <a href="https://arxiv.org/format/1205.3282">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-ph</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/10.1103/PhysRevB.85.235105">10.1103/PhysRevB.85.235105 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Ab initio complex band structure of conjugated polymers: Effects of hydrid DFT and GW schemes </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ferretti%2C+A">Andrea Ferretti</a>, <a href="/search/physics?searchtype=author&query=Mallia%2C+G">Giuseppe Mallia</a>, <a href="/search/physics?searchtype=author&query=Martin-Samos%2C+L">Layla Martin-Samos</a>, <a href="/search/physics?searchtype=author&query=Bussi%2C+G">Giovanni Bussi</a>, <a href="/search/physics?searchtype=author&query=Ruini%2C+A">Alice Ruini</a>, <a href="/search/physics?searchtype=author&query=Montanari%2C+B">Barbara Montanari</a>, <a href="/search/physics?searchtype=author&query=Harrison%2C+N+M">Nicholas M. Harrison</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="1205.3282v2-abstract-short" style="display: inline;"> The non-resonant tunneling regime for charge transfer across nanojunctions is critically dependent on the so-called 尾 parameter, governing the exponential decay of the current as the length of the junction increases. For periodic materials, this parameter can be theoretically evaluated by computing the complex band structure (CBS) -- or evanescent states -- of the material forming the tunneling ju… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1205.3282v2-abstract-full').style.display = 'inline'; document.getElementById('1205.3282v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1205.3282v2-abstract-full" style="display: none;"> The non-resonant tunneling regime for charge transfer across nanojunctions is critically dependent on the so-called 尾 parameter, governing the exponential decay of the current as the length of the junction increases. For periodic materials, this parameter can be theoretically evaluated by computing the complex band structure (CBS) -- or evanescent states -- of the material forming the tunneling junction. In this work we present the calculation of the CBS for organic polymers using a variety of computational schemes, including standard local, semilocal, and hybrid-exchange density functionals, and many-body perturbation theory within the GW approximation. We compare the description of localization and 尾 parameters among the adopted methods and with experimental data. We show that local and semilocal density functionals systematically underestimate the 尾 parameter, while hybrid-exchange schemes partially correct for this discrepancy, resulting in a much better agreement with GW calculations and experiments. Self-consistency effects and self-energy representation issues of the GW corrections are discussed together with the use of Wannier functions to interpolate the electronic band-structure. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1205.3282v2-abstract-full').style.display = 'none'; document.getElementById('1205.3282v2-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> 31 May, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 May, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2012. </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">Accepted for publication on Physical Review B v2: fixed some typos</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 85, 235105 (2012) </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg> <a href="https://info.arxiv.org/help/contact.html"> Contact</a> </li> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>subscribe to arXiv mailings</title><desc>Click here to subscribe</desc><path d="M476 3.2L12.5 270.6c-18.1 10.4-15.8 35.6 2.2 43.2L121 358.4l287.3-253.2c5.5-4.9 13.3 2.6 8.6 8.3L176 407v80.5c0 23.6 28.5 32.9 42.5 15.8L282 426l124.6 52.2c14.2 6 30.4-2.9 33-18.2l72-432C515 7.8 493.3-6.8 476 3.2z"/></svg> <a href="https://info.arxiv.org/help/subscribe"> Subscribe</a> </li> </ul> </div> </div> </div>   <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/license/index.html">Copyright</a></li> <li><a href="https://info.arxiv.org/help/policies/privacy_policy.html">Privacy Policy</a></li> </ul> </div> <div class="column sorry-app-links"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/web_accessibility.html">Web Accessibility Assistance</a></li> <li> <p class="help"> <a class="a11y-main-link" href="https://status.arxiv.org" target="_blank">arXiv Operational Status <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 512" class="icon filter-dark_grey" role="presentation"><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"/></svg></a><br> Get status notifications via <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/email/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg>email</a> or <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/slack/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" class="icon filter-black" role="presentation"><path d="M94.12 315.1c0 25.9-21.16 47.06-47.06 47.06S0 341 0 315.1c0-25.9 21.16-47.06 47.06-47.06h47.06v47.06zm23.72 0c0-25.9 21.16-47.06 47.06-47.06s47.06 21.16 47.06 47.06v117.84c0 25.9-21.16 47.06-47.06 47.06s-47.06-21.16-47.06-47.06V315.1zm47.06-188.98c-25.9 0-47.06-21.16-47.06-47.06S139 32 164.9 32s47.06 21.16 47.06 47.06v47.06H164.9zm0 23.72c25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06H47.06C21.16 243.96 0 222.8 0 196.9s21.16-47.06 47.06-47.06H164.9zm188.98 47.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06h-47.06V196.9zm-23.72 0c0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06V79.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06V196.9zM283.1 385.88c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06v-47.06h47.06zm0-23.72c-25.9 0-47.06-21.16-47.06-47.06 0-25.9 21.16-47.06 47.06-47.06h117.84c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06H283.1z"/></svg>slack</a> </p> </li> </ul> </div> </div> </div>  </div> </footer> <script src="https://static.arxiv.org/static/base/1.0.0a5/js/member_acknowledgement.js"></script> </body> </html>

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