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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/2406.13516">arXiv:2406.13516</a> <span> [<a href="https://arxiv.org/pdf/2406.13516">pdf</a>, <a href="https://arxiv.org/format/2406.13516">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="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Direct neutrino-mass measurement based on 259 days of KATRIN data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Aker%2C+M">M. Aker</a>, <a href="/search/nucl-ex?searchtype=author&query=Batzler%2C+D">D. Batzler</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/nucl-ex?searchtype=author&query=Beisenk%C3%B6tter%2C+J">J. Beisenk枚tter</a>, <a href="/search/nucl-ex?searchtype=author&query=Biassoni%2C+M">M. Biassoni</a>, <a href="/search/nucl-ex?searchtype=author&query=Bieringer%2C+B">B. Bieringer</a>, <a href="/search/nucl-ex?searchtype=author&query=Biondi%2C+Y">Y. Biondi</a>, <a href="/search/nucl-ex?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/nucl-ex?searchtype=author&query=Bobien%2C+S">S. Bobien</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6ttcher%2C+M">M. B枚ttcher</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Carminati%2C+M">M. Carminati</a>, <a href="/search/nucl-ex?searchtype=author&query=Chatrabhuti%2C+A">A. Chatrabhuti</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Daniel%2C+B+A">B. A. Daniel</a>, <a href="/search/nucl-ex?searchtype=author&query=Debowski%2C+K">K. Debowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Descher%2C+M">M. Descher</a>, <a href="/search/nucl-ex?searchtype=author&query=Barrero%2C+D+D">D. D铆az Barrero</a>, <a href="/search/nucl-ex?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/nucl-ex?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/nucl-ex?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/nucl-ex?searchtype=author&query=Edzards%2C+F">F. Edzards</a> , et al. (124 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="2406.13516v1-abstract-short" style="display: inline;"> The fact that neutrinos carry a non-vanishing rest mass is evidence of physics beyond the Standard Model of elementary particles. Their absolute mass bears important relevance from particle physics to cosmology. In this work, we report on the search for the effective electron antineutrino mass with the KATRIN experiment. KATRIN performs precision spectroscopy of the tritium $尾$-decay close to the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.13516v1-abstract-full').style.display = 'inline'; document.getElementById('2406.13516v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.13516v1-abstract-full" style="display: none;"> The fact that neutrinos carry a non-vanishing rest mass is evidence of physics beyond the Standard Model of elementary particles. Their absolute mass bears important relevance from particle physics to cosmology. In this work, we report on the search for the effective electron antineutrino mass with the KATRIN experiment. KATRIN performs precision spectroscopy of the tritium $尾$-decay close to the kinematic endpoint. Based on the first five neutrino-mass measurement campaigns, we derive a best-fit value of $m_谓^{2} = {-0.14^{+0.13}_{-0.15}}~\mathrm{eV^2}$, resulting in an upper limit of $m_谓< {0.45}~\mathrm{eV}$ at 90 % confidence level. With six times the statistics of previous data sets, amounting to 36 million electrons collected in 259 measurement days, a substantial reduction of the background level and improved systematic uncertainties, this result tightens KATRIN's previous bound by a factor of almost two. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.13516v1-abstract-full').style.display = 'none'; document.getElementById('2406.13516v1-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 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">61 pages, 20 figures, 2 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.06337">arXiv:2207.06337</a> <span> [<a href="https://arxiv.org/pdf/2207.06337">pdf</a>, <a href="https://arxiv.org/format/2207.06337">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> </div> </div> <p class="title is-5 mathjax"> Search for keV-scale Sterile Neutrinos with first KATRIN Data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Aker%2C+M">M. Aker</a>, <a href="/search/nucl-ex?searchtype=author&query=Batzler%2C+D">D. Batzler</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/nucl-ex?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/nucl-ex?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bieringer%2C+B">B. Bieringer</a>, <a href="/search/nucl-ex?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/nucl-ex?searchtype=author&query=Bobien%2C+S">S. Bobien</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6ttcher%2C+M">M. B枚ttcher</a>, <a href="/search/nucl-ex?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Carney%2C+R+M+D">R. M. D. Carney</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+W">W. Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Debowski%2C+K">K. Debowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Descher%2C+M">M. Descher</a>, <a href="/search/nucl-ex?searchtype=author&query=Barrero%2C+D+D">D. D铆az Barrero</a>, <a href="/search/nucl-ex?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/nucl-ex?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/nucl-ex?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/nucl-ex?searchtype=author&query=Edzards%2C+F">F. Edzards</a>, <a href="/search/nucl-ex?searchtype=author&query=Eitel%2C+K">K. Eitel</a> , et al. (106 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="2207.06337v1-abstract-short" style="display: inline;"> In this work we present a keV-scale sterile-neutrino search with the first tritium data of the KATRIN experiment, acquired in the commissioning run in 2018. KATRIN performs a spectroscopic measurement of the tritium $尾$-decay spectrum with the main goal of directly determining the effective electron anti-neutrino mass. During this commissioning phase a lower tritium activity facilitated the search… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.06337v1-abstract-full').style.display = 'inline'; document.getElementById('2207.06337v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.06337v1-abstract-full" style="display: none;"> In this work we present a keV-scale sterile-neutrino search with the first tritium data of the KATRIN experiment, acquired in the commissioning run in 2018. KATRIN performs a spectroscopic measurement of the tritium $尾$-decay spectrum with the main goal of directly determining the effective electron anti-neutrino mass. During this commissioning phase a lower tritium activity facilitated the search for sterile neutrinos with a mass of up to $1.6\, \mathrm{keV}$. We do not find a signal and set an exclusion limit on the sterile-to-active mixing amplitude of down to $\sin^2胃< 5\cdot10^{-4}$ ($95\,\%$ C.L.), improving current laboratory-based bounds in the sterile-neutrino mass range between 0.1 and $1.0\, \mathrm{keV}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.06337v1-abstract-full').style.display = 'none'; document.getElementById('2207.06337v1-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 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.06326">arXiv:2207.06326</a> <span> [<a href="https://arxiv.org/pdf/2207.06326">pdf</a>, <a href="https://arxiv.org/format/2207.06326">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="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div 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/PhysRevD.107.082005">10.1103/PhysRevD.107.082005 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for Lorentz-Invariance Violation with the first KATRIN data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Aker%2C+M">M. Aker</a>, <a href="/search/nucl-ex?searchtype=author&query=Batzler%2C+D">D. Batzler</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/nucl-ex?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/nucl-ex?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bieringer%2C+B">B. Bieringer</a>, <a href="/search/nucl-ex?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/nucl-ex?searchtype=author&query=Bobien%2C+S">S. Bobien</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6ttcher%2C+M">M. B枚ttcher</a>, <a href="/search/nucl-ex?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Carney%2C+R+M+D">R. M. D. Carney</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+W">W. Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Debowski%2C+K">K. Debowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Deffert%2C+M">M. Deffert</a>, <a href="/search/nucl-ex?searchtype=author&query=Descher%2C+M">M. Descher</a>, <a href="/search/nucl-ex?searchtype=author&query=Barrero%2C+D+D">D. D铆az Barrero</a>, <a href="/search/nucl-ex?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/nucl-ex?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/nucl-ex?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/nucl-ex?searchtype=author&query=Edzards%2C+F">F. Edzards</a> , et al. (108 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="2207.06326v1-abstract-short" style="display: inline;"> Some extensions of the Standard Model of Particle Physics allow for Lorentz invariance and Charge-Parity-Time (CPT)-invariance violations. In the neutrino sector strong constraints have been set by neutrino-oscillation and time-of-flight experiments. However, some Lorentz-invariance-violating parameters are not accessible via these probes. In this work, we focus on the parameters… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.06326v1-abstract-full').style.display = 'inline'; document.getElementById('2207.06326v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.06326v1-abstract-full" style="display: none;"> Some extensions of the Standard Model of Particle Physics allow for Lorentz invariance and Charge-Parity-Time (CPT)-invariance violations. In the neutrino sector strong constraints have been set by neutrino-oscillation and time-of-flight experiments. However, some Lorentz-invariance-violating parameters are not accessible via these probes. In this work, we focus on the parameters $(a_{\text{of}}^{(3)})_{00}$, $(a_{\text{of}}^{(3)})_{10}$ and $(a_{\text{of}}^{(3)})_{11}$ which would manifest themselves in a non-isotropic beta-decaying source as a sidereal oscillation and an overall shift of the spectral endpoint. Based on the data of the first scientific run of the KATRIN experiment, we set the first limit on $\left|(a_{\text{of}}^{(3)})_{11}\right|$ of $< 3.7\cdot10^{-6}$ GeV at 90\% confidence level. Moreover, we derive new constraints on $(a_{\text{of}}^{(3)})_{00}$ and $(a_{\text{of}}^{(3)})_{10}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.06326v1-abstract-full').style.display = 'none'; document.getElementById('2207.06326v1-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 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.08059">arXiv:2203.08059</a> <span> [<a href="https://arxiv.org/pdf/2203.08059">pdf</a>, <a href="https://arxiv.org/format/2203.08059">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="Cosmology and Nongalactic Astrophysics">astro-ph.CO</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="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/10.1088/1361-6471/ac834e">10.1088/1361-6471/ac834e <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> KATRIN: Status and Prospects for the Neutrino Mass and Beyond </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Aker%2C+M">M. Aker</a>, <a href="/search/nucl-ex?searchtype=author&query=Balzer%2C+M">M. Balzer</a>, <a href="/search/nucl-ex?searchtype=author&query=Batzler%2C+D">D. Batzler</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/nucl-ex?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/nucl-ex?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/nucl-ex?searchtype=author&query=Biassoni%2C+M">M. Biassoni</a>, <a href="/search/nucl-ex?searchtype=author&query=Bieringer%2C+B">B. Bieringer</a>, <a href="/search/nucl-ex?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/nucl-ex?searchtype=author&query=Bobien%2C+S">S. Bobien</a>, <a href="/search/nucl-ex?searchtype=author&query=Bombelli%2C+L">L. Bombelli</a>, <a href="/search/nucl-ex?searchtype=author&query=Bormann%2C+D">D. Bormann</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6ttcher%2C+M">M. B枚ttcher</a>, <a href="/search/nucl-ex?searchtype=author&query=Brofferio%2C+C">C. Brofferio</a>, <a href="/search/nucl-ex?searchtype=author&query=Bruch%2C+C">C. Bruch</a>, <a href="/search/nucl-ex?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Carminati%2C+M">M. Carminati</a>, <a href="/search/nucl-ex?searchtype=author&query=Carney%2C+R+M+D">R. M. D. Carney</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+W">W. Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Cremonesi%2C+O">O. Cremonesi</a> , et al. (137 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2203.08059v3-abstract-short" style="display: inline;"> The Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to measure a high-precision integral spectrum of the endpoint region of T2 beta decay, with the primary goal of probing the absolute mass scale of the neutrino. After a first tritium commissioning campaign in 2018, the experiment has been regularly running since 2019, and in its first two measurement campaigns has already achieved a su… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.08059v3-abstract-full').style.display = 'inline'; document.getElementById('2203.08059v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.08059v3-abstract-full" style="display: none;"> The Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to measure a high-precision integral spectrum of the endpoint region of T2 beta decay, with the primary goal of probing the absolute mass scale of the neutrino. After a first tritium commissioning campaign in 2018, the experiment has been regularly running since 2019, and in its first two measurement campaigns has already achieved a sub-eV sensitivity. After 1000 days of data-taking, KATRIN's design sensitivity is 0.2 eV at the 90% confidence level. In this white paper we describe the current status of KATRIN; explore prospects for measuring the neutrino mass and other physics observables, including sterile neutrinos and other beyond-Standard-Model hypotheses; and discuss research-and-development projects that may further improve the KATRIN sensitivity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.08059v3-abstract-full').style.display = 'none'; document.getElementById('2203.08059v3-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 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Contribution to Snowmass 2021. 70 pages excluding references; 35 figures. Author list updated June 2023</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys. G: Nucl. Part. Phys. 49 (2022) 100501 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2202.04587">arXiv:2202.04587</a> <span> [<a href="https://arxiv.org/pdf/2202.04587">pdf</a>, <a href="https://arxiv.org/format/2202.04587">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="Cosmology and Nongalactic Astrophysics">astro-ph.CO</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/10.1103/PhysRevLett.129.011806">10.1103/PhysRevLett.129.011806 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> New Constraint on the Local Relic Neutrino Background Overdensity with the First KATRIN Data Runs </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Aker%2C+M">M. Aker</a>, <a href="/search/nucl-ex?searchtype=author&query=Batzler%2C+D">D. Batzler</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/nucl-ex?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/nucl-ex?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bieringer%2C+B">B. Bieringer</a>, <a href="/search/nucl-ex?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/nucl-ex?searchtype=author&query=Bobien%2C+S">S. Bobien</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6ttcher%2C+M">M. B枚ttcher</a>, <a href="/search/nucl-ex?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Carney%2C+R+M+D">R. M. D. Carney</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+W">W. Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Debowski%2C+K">K. Debowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Descher%2C+M">M. Descher</a>, <a href="/search/nucl-ex?searchtype=author&query=Barrero%2C+D+D">D. D铆az Barrero</a>, <a href="/search/nucl-ex?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/nucl-ex?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/nucl-ex?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/nucl-ex?searchtype=author&query=Edzards%2C+F">F. Edzards</a>, <a href="/search/nucl-ex?searchtype=author&query=Eitel%2C+K">K. Eitel</a> , et al. (107 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="2202.04587v1-abstract-short" style="display: inline;"> We report on the direct cosmic relic neutrino background search from the first two science runs of the KATRIN experiment in 2019. Beta-decay electrons from a high-purity molecular tritium gas source are analyzed by a high-resolution MAC-E filter around the kinematic endpoint at 18.57 keV. The analysis is sensitive to a local relic neutrino overdensity of 9.7e10 (1.1e11) at a 90% (95%) confidence l… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2202.04587v1-abstract-full').style.display = 'inline'; document.getElementById('2202.04587v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2202.04587v1-abstract-full" style="display: none;"> We report on the direct cosmic relic neutrino background search from the first two science runs of the KATRIN experiment in 2019. Beta-decay electrons from a high-purity molecular tritium gas source are analyzed by a high-resolution MAC-E filter around the kinematic endpoint at 18.57 keV. The analysis is sensitive to a local relic neutrino overdensity of 9.7e10 (1.1e11) at a 90% (95%) confidence level. A fit of the integrated electron spectrum over a narrow interval around the kinematic endpoint accounting for relic neutrino captures in the Tritium source reveals no significant overdensity. This work improves the results obtained by the previous kinematic neutrino mass experiments at Los Alamos and Troitsk. We furthermore update the projected final sensitivity of the KATRIN experiment to <1e10 at 90% confidence level, by relying on updated operational conditions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2202.04587v1-abstract-full').style.display = 'none'; document.getElementById('2202.04587v1-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 February, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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">7 pages, 7 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/2105.08533">arXiv:2105.08533</a> <span> [<a href="https://arxiv.org/pdf/2105.08533">pdf</a>, <a href="https://arxiv.org/format/2105.08533">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="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> First direct neutrino-mass measurement with sub-eV sensitivity </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Aker%2C+M">M. Aker</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/nucl-ex?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/nucl-ex?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bieringer%2C+B">B. Bieringer</a>, <a href="/search/nucl-ex?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6ttcher%2C+M">M. B枚ttcher</a>, <a href="/search/nucl-ex?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Carney%2C+R+M+D">R. M. D. Carney</a>, <a href="/search/nucl-ex?searchtype=author&query=La+Cascio%2C+L">L. La Cascio</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+W">W. Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Debowski%2C+K">K. Debowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Deffert%2C+M">M. Deffert</a>, <a href="/search/nucl-ex?searchtype=author&query=Descher%2C+M">M. Descher</a>, <a href="/search/nucl-ex?searchtype=author&query=Barrero%2C+D+D">D. D铆az Barrero</a>, <a href="/search/nucl-ex?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/nucl-ex?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/nucl-ex?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/nucl-ex?searchtype=author&query=Eitel%2C+K">K. Eitel</a>, <a href="/search/nucl-ex?searchtype=author&query=Ellinger%2C+E">E. Ellinger</a> , et al. (103 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="2105.08533v1-abstract-short" style="display: inline;"> We report the results of the second measurement campaign of the Karlsruhe Tritium Neutrino (KATRIN) experiment. KATRIN probes the effective electron anti-neutrino mass, $m_谓$, via a high-precision measurement of the tritium $尾$-decay spectrum close to its endpoint at $18.6\,\mathrm{keV}$. In the second physics run presented here, the source activity was increased by a factor of 3.8 and the backgro… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.08533v1-abstract-full').style.display = 'inline'; document.getElementById('2105.08533v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2105.08533v1-abstract-full" style="display: none;"> We report the results of the second measurement campaign of the Karlsruhe Tritium Neutrino (KATRIN) experiment. KATRIN probes the effective electron anti-neutrino mass, $m_谓$, via a high-precision measurement of the tritium $尾$-decay spectrum close to its endpoint at $18.6\,\mathrm{keV}$. In the second physics run presented here, the source activity was increased by a factor of 3.8 and the background was reduced by $25\,\%$ with respect to the first campaign. A sensitivity on $m_谓$ of $0.7\,\mathrm{eV/c^2}$ at $90\,\%$ confidence level (CL) was reached. This is the first sub-eV sensitivity from a direct neutrino-mass experiment. The best fit to the spectral data yields $m_谓^2 = (0.26\pm0.34)\,\mathrm{eV^4/c^4}$, resulting in an upper limit of $m_谓<0.9\,\mathrm{eV/c^2}$ ($90\,\%$ CL). By combining this result with the first neutrino mass campaign, we find an upper limit of $m_谓<0.8\,\mathrm{eV/c^2}$ ($90\,\%$ CL). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.08533v1-abstract-full').style.display = 'none'; document.getElementById('2105.08533v1-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> 18 May, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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">19 pages, 10 figures, 5 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2101.05253">arXiv:2101.05253</a> <span> [<a href="https://arxiv.org/pdf/2101.05253">pdf</a>, <a href="https://arxiv.org/format/2101.05253">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="Cosmology and Nongalactic Astrophysics">astro-ph.CO</span> <span class="tag is-small is-grey 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 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/PhysRevD.104.012005">10.1103/PhysRevD.104.012005 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Analysis methods for the first KATRIN neutrino-mass measurement </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Aker%2C+M">M. Aker</a>, <a href="/search/nucl-ex?searchtype=author&query=Altenm%C3%BCller%2C+K">K. Altenm眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/nucl-ex?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/nucl-ex?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bieringer%2C+B">B. Bieringer</a>, <a href="/search/nucl-ex?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/nucl-ex?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6ttcher%2C+M">M. B枚ttcher</a>, <a href="/search/nucl-ex?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=La+Cascio%2C+L">L. La Cascio</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+W">W. Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Barrero%2C+D+D">D. D铆az Barrero</a>, <a href="/search/nucl-ex?searchtype=author&query=Debowski%2C+K">K. Debowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Deffert%2C+M">M. Deffert</a>, <a href="/search/nucl-ex?searchtype=author&query=Descher%2C+M">M. Descher</a>, <a href="/search/nucl-ex?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/nucl-ex?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/nucl-ex?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/nucl-ex?searchtype=author&query=Dyba%2C+S">S. Dyba</a> , et al. (104 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="2101.05253v3-abstract-short" style="display: inline;"> We report on the data set, data handling, and detailed analysis techniques of the first neutrino-mass measurement by the Karlsruhe Tritium Neutrino (KATRIN) experiment, which probes the absolute neutrino-mass scale via the $尾$-decay kinematics of molecular tritium. The source is highly pure, cryogenic T$_2$ gas. The $尾$ electrons are guided along magnetic field lines toward a high-resolution, inte… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2101.05253v3-abstract-full').style.display = 'inline'; document.getElementById('2101.05253v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2101.05253v3-abstract-full" style="display: none;"> We report on the data set, data handling, and detailed analysis techniques of the first neutrino-mass measurement by the Karlsruhe Tritium Neutrino (KATRIN) experiment, which probes the absolute neutrino-mass scale via the $尾$-decay kinematics of molecular tritium. The source is highly pure, cryogenic T$_2$ gas. The $尾$ electrons are guided along magnetic field lines toward a high-resolution, integrating spectrometer for energy analysis. A silicon detector counts $尾$ electrons above the energy threshold of the spectrometer, so that a scan of the thresholds produces a precise measurement of the high-energy spectral tail. After detailed theoretical studies, simulations, and commissioning measurements, extending from the molecular final-state distribution to inelastic scattering in the source to subtleties of the electromagnetic fields, our independent, blind analyses allow us to set an upper limit of 1.1 eV on the neutrino-mass scale at a 90\% confidence level. This first result, based on a few weeks of running at a reduced source intensity and dominated by statistical uncertainty, improves on prior limits by nearly a factor of two. This result establishes an analysis framework for future KATRIN measurements, and provides important input to both particle theory and cosmology. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2101.05253v3-abstract-full').style.display = 'none'; document.getElementById('2101.05253v3-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> 12 May, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 January, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 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">36 pages with 26 figures. Accepted to Phys. Rev. D</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 104, 012005 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2011.05087">arXiv:2011.05087</a> <span> [<a href="https://arxiv.org/pdf/2011.05087">pdf</a>, <a href="https://arxiv.org/format/2011.05087">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="Nuclear Experiment">nucl-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/10.1103/PhysRevLett.126.091803">10.1103/PhysRevLett.126.091803 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Bound on 3+1 active-sterile neutrino mixing from the first four-week science run of KATRIN </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Aker%2C+M">M. Aker</a>, <a href="/search/nucl-ex?searchtype=author&query=Altenmueller%2C+K">K. Altenmueller</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/nucl-ex?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/nucl-ex?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bieringer%2C+B">B. Bieringer</a>, <a href="/search/nucl-ex?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/nucl-ex?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Boettcher%2C+M">M. Boettcher</a>, <a href="/search/nucl-ex?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=La+Cascio%2C+L">L. La Cascio</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+W">W. Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Barrero%2C+D+D">D. Diaz Barrero</a>, <a href="/search/nucl-ex?searchtype=author&query=Debowski%2C+K">K. Debowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Deffert%2C+M">M. Deffert</a>, <a href="/search/nucl-ex?searchtype=author&query=Descher%2C+M">M. Descher</a>, <a href="/search/nucl-ex?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/nucl-ex?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/nucl-ex?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/nucl-ex?searchtype=author&query=Dyba%2C+S">S. Dyba</a> , et al. (104 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="2011.05087v1-abstract-short" style="display: inline;"> We report on the light sterile neutrino search from the first four-week science run of the KATRIN experiment in~2019. Beta-decay electrons from a high-purity gaseous molecular tritium source are analyzed by a high-resolution MAC-E filter down to 40 eV below the endpoint at 18.57 keV. We consider the framework with three active neutrinos and one sterile neutrino of mass $m_{4}$. The analysis is sen… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.05087v1-abstract-full').style.display = 'inline'; document.getElementById('2011.05087v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2011.05087v1-abstract-full" style="display: none;"> We report on the light sterile neutrino search from the first four-week science run of the KATRIN experiment in~2019. Beta-decay electrons from a high-purity gaseous molecular tritium source are analyzed by a high-resolution MAC-E filter down to 40 eV below the endpoint at 18.57 keV. We consider the framework with three active neutrinos and one sterile neutrino of mass $m_{4}$. The analysis is sensitive to a fourth mass state $m^2_{4} \lesssim$ 1000 eV$^2$ and to active-to-sterile neutrino mixing down to $|U_{e4}|^2 \gtrsim 2\cdot10^{-2}$. No significant spectral distortion is observed and exclusion bounds on the sterile mass and mixing are reported. These new limits supersede the Mainz results and improve the Troitsk bound for $m^2_{4} <$ 30 eV$^2$. The reactor and gallium anomalies are constrained for $ 100 < 螖{m}^2_{41} < 1000$ eV$^2$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.05087v1-abstract-full').style.display = 'none'; document.getElementById('2011.05087v1-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 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">8 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 126, 091803 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1909.06069">arXiv:1909.06069</a> <span> [<a href="https://arxiv.org/pdf/1909.06069">pdf</a>, <a href="https://arxiv.org/format/1909.06069">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="Cosmology and Nongalactic Astrophysics">astro-ph.CO</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epjc/s10052-020-7718-z">10.1140/epjc/s10052-020-7718-z <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First operation of the KATRIN experiment with tritium </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Aker%2C+M">M. Aker</a>, <a href="/search/nucl-ex?searchtype=author&query=Altenm%C3%BCller%2C+K">K. Altenm眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Arenz%2C+M">M. Arenz</a>, <a href="/search/nucl-ex?searchtype=author&query=Baek%2C+W+-">W. -J. Baek</a>, <a href="/search/nucl-ex?searchtype=author&query=Barrett%2C+J">J. Barrett</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/nucl-ex?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/nucl-ex?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/nucl-ex?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/nucl-ex?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/nucl-ex?searchtype=author&query=Bobien%2C+S">S. Bobien</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bouquet%2C+H">H. Bouquet</a>, <a href="/search/nucl-ex?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+W">W. Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Debowski%2C+K">K. Debowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Deffert%2C+M">M. Deffert</a>, <a href="/search/nucl-ex?searchtype=author&query=Descher%2C+M">M. Descher</a>, <a href="/search/nucl-ex?searchtype=author&query=Barrero%2C+D+D">D. D铆az Barrero</a>, <a href="/search/nucl-ex?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/nucl-ex?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a> , et al. (146 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="1909.06069v1-abstract-short" style="display: inline;"> The determination of the neutrino mass is one of the major challenges in astroparticle physics today. Direct neutrino mass experiments, based solely on the kinematics of beta-decay, provide a largely model-independent probe to the neutrino mass scale. The Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to directly measure the effective electron antineutrino mass with a sensitivity of 0.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.06069v1-abstract-full').style.display = 'inline'; document.getElementById('1909.06069v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1909.06069v1-abstract-full" style="display: none;"> The determination of the neutrino mass is one of the major challenges in astroparticle physics today. Direct neutrino mass experiments, based solely on the kinematics of beta-decay, provide a largely model-independent probe to the neutrino mass scale. The Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to directly measure the effective electron antineutrino mass with a sensitivity of 0.2 eV 90% CL. In this work we report on the first operation of KATRIN with tritium which took place in 2018. During this commissioning phase of the tritium circulation system, excellent agreement of the theoretical prediction with the recorded spectra was found and stable conditions over a time period of 13 days could be established. These results are an essential prerequisite for the subsequent neutrino mass measurements with KATRIN in 2019. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.06069v1-abstract-full').style.display = 'none'; document.getElementById('1909.06069v1-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 September, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1909.06048">arXiv:1909.06048</a> <span> [<a href="https://arxiv.org/pdf/1909.06048">pdf</a>, <a href="https://arxiv.org/format/1909.06048">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="Cosmology and Nongalactic Astrophysics">astro-ph.CO</span> <span class="tag is-small is-grey 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 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/PhysRevLett.123.221802">10.1103/PhysRevLett.123.221802 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> An improved upper limit on the neutrino mass from a direct kinematic method by KATRIN </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Aker%2C+M">M. Aker</a>, <a href="/search/nucl-ex?searchtype=author&query=Altenm%C3%BCller%2C+K">K. Altenm眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Arenz%2C+M">M. Arenz</a>, <a href="/search/nucl-ex?searchtype=author&query=Babutzka%2C+M">M. Babutzka</a>, <a href="/search/nucl-ex?searchtype=author&query=Barrett%2C+J">J. Barrett</a>, <a href="/search/nucl-ex?searchtype=author&query=Bauer%2C+S">S. Bauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+M">M. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/nucl-ex?searchtype=author&query=Bergmann%2C+T">T. Bergmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/nucl-ex?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/nucl-ex?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/nucl-ex?searchtype=author&query=Bobien%2C+S">S. Bobien</a>, <a href="/search/nucl-ex?searchtype=author&query=Bokeloh%2C+K">K. Bokeloh</a>, <a href="/search/nucl-ex?searchtype=author&query=Bonn%2C+J">J. Bonn</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bouquet%2C+H">H. Bouquet</a>, <a href="/search/nucl-ex?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=La+Cascio%2C+L">L. La Cascio</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+W">W. Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Corona%2C+T+J">T. J. Corona</a> , et al. (184 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="1909.06048v1-abstract-short" style="display: inline;"> We report on the neutrino mass measurement result from the first four-week science run of the Karlsruhe Tritium Neutrino experiment KATRIN in spring 2019. Beta-decay electrons from a high-purity gaseous molecular tritium source are energy analyzed by a high-resolution MAC-E filter. A fit of the integrated electron spectrum over a narrow interval around the kinematic endpoint at 18.57 keV gives an… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.06048v1-abstract-full').style.display = 'inline'; document.getElementById('1909.06048v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1909.06048v1-abstract-full" style="display: none;"> We report on the neutrino mass measurement result from the first four-week science run of the Karlsruhe Tritium Neutrino experiment KATRIN in spring 2019. Beta-decay electrons from a high-purity gaseous molecular tritium source are energy analyzed by a high-resolution MAC-E filter. A fit of the integrated electron spectrum over a narrow interval around the kinematic endpoint at 18.57 keV gives an effective neutrino mass square value of $(-1.0^{+0.9}_{-1.1})$ eV$^2$. From this we derive an upper limit of 1.1 eV (90$\%$ confidence level) on the absolute mass scale of neutrinos. This value coincides with the KATRIN sensitivity. It improves upon previous mass limits from kinematic measurements by almost a factor of two and provides model-independent input to cosmological studies of structure formation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.06048v1-abstract-full').style.display = 'none'; document.getElementById('1909.06048v1-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 September, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 123, 221802 (2019) </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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