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<button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2401.07564">arXiv:2401.07564</a> <span> [<a href="https://arxiv.org/pdf/2401.07564">pdf</a>, <a href="https://arxiv.org/format/2401.07564">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 - Phenomenology">hep-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"> Focus topics for the ECFA study on Higgs / Top / EW factories </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=de+Blas%2C+J">Jorge de Blas</a>, <a href="/search/hep-ph?searchtype=author&query=Koppenburg%2C+P">Patrick Koppenburg</a>, <a href="/search/hep-ph?searchtype=author&query=List%2C+J">Jenny List</a>, <a href="/search/hep-ph?searchtype=author&query=Maltoni%2C+F">Fabio Maltoni</a>, <a href="/search/hep-ph?searchtype=author&query=Maestre%2C+J+A">Juan Alcaraz Maestre</a>, <a href="/search/hep-ph?searchtype=author&query=Alimena%2C+J">Juliette Alimena</a>, <a href="/search/hep-ph?searchtype=author&query=Alison%2C+J">John Alison</a>, <a href="/search/hep-ph?searchtype=author&query=Azzi%2C+P">Patrizia Azzi</a>, <a href="/search/hep-ph?searchtype=author&query=Azzurri%2C+P">Paolo Azzurri</a>, <a href="/search/hep-ph?searchtype=author&query=Bagnaschi%2C+E">Emanuele Bagnaschi</a>, <a href="/search/hep-ph?searchtype=author&query=Barklow%2C+T">Timothy Barklow</a>, <a href="/search/hep-ph?searchtype=author&query=Basso%2C+M+J">Matthew J. Basso</a>, <a href="/search/hep-ph?searchtype=author&query=Bendavid%2C+J">Josh Bendavid</a>, <a href="/search/hep-ph?searchtype=author&query=Beneke%2C+M">Martin Beneke</a>, <a href="/search/hep-ph?searchtype=author&query=Ben-Haim%2C+E">Eli Ben-Haim</a>, <a href="/search/hep-ph?searchtype=author&query=Berggren%2C+M">Mikael Berggren</a>, <a href="/search/hep-ph?searchtype=author&query=Bordone%2C+M">Marzia Bordone</a>, <a href="/search/hep-ph?searchtype=author&query=Bozovic%2C+I">Ivanka Bozovic</a>, <a href="/search/hep-ph?searchtype=author&query=Cairo%2C+V">Valentina Cairo</a>, <a href="/search/hep-ph?searchtype=author&query=Castro%2C+N+F">Nuno Filipe Castro</a>, <a href="/search/hep-ph?searchtype=author&query=Cobal%2C+M">Marina Cobal</a>, <a href="/search/hep-ph?searchtype=author&query=Collins%2C+P">Paula Collins</a>, <a href="/search/hep-ph?searchtype=author&query=Dam%2C+M">Mogens Dam</a>, <a href="/search/hep-ph?searchtype=author&query=Dao%2C+V">Valerio Dao</a>, <a href="/search/hep-ph?searchtype=author&query=Defranchis%2C+M">Matteo Defranchis</a> , et al. (83 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="2401.07564v3-abstract-short" style="display: inline;"> In order to stimulate new engagement and trigger some concrete studies in areas where further work would be beneficial towards fully understanding the physics potential of an $e^+e^-$ Higgs / Top / Electroweak factory, we propose to define a set of focus topics. The general reasoning and the proposed topics are described in this document. </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.07564v3-abstract-full" style="display: none;"> In order to stimulate new engagement and trigger some concrete studies in areas where further work would be beneficial towards fully understanding the physics potential of an $e^+e^-$ Higgs / Top / Electroweak factory, we propose to define a set of focus topics. The general reasoning and the proposed topics are described in this document. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.07564v3-abstract-full').style.display = 'none'; document.getElementById('2401.07564v3-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 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">v3: fixed spelling of two authors</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2306.08686">arXiv:2306.08686</a> <span> [<a href="https://arxiv.org/pdf/2306.08686">pdf</a>, <a href="https://arxiv.org/format/2306.08686">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 - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/JHEP10(2023)138">10.1007/JHEP10(2023)138 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Top Secrets: Long-Lived ALPs in Top Production </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Rygaard%2C+L">Lovisa Rygaard</a>, <a href="/search/hep-ph?searchtype=author&query=Niedziela%2C+J">Jeremi Niedziela</a>, <a href="/search/hep-ph?searchtype=author&query=Sch%C3%A4fer%2C+R">Ruth Sch盲fer</a>, <a href="/search/hep-ph?searchtype=author&query=Bruggisser%2C+S">Sebastian Bruggisser</a>, <a href="/search/hep-ph?searchtype=author&query=Alimena%2C+J">Juliette Alimena</a>, <a href="/search/hep-ph?searchtype=author&query=Westhoff%2C+S">Susanne Westhoff</a>, <a href="/search/hep-ph?searchtype=author&query=Blekman%2C+F">Freya Blekman</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="2306.08686v2-abstract-short" style="display: inline;"> We investigate the discovery potential for long-lived particles produced in association with a top-antitop quark pair at the (High-Luminosity) LHC. Compared to inclusive searches for a displaced vertex, top-associated signals offer new trigger options and an extra handle to suppress background. We design a search strategy for a displaced di-muon vertex in the tracking detectors, in association wit… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.08686v2-abstract-full').style.display = 'inline'; document.getElementById('2306.08686v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2306.08686v2-abstract-full" style="display: none;"> We investigate the discovery potential for long-lived particles produced in association with a top-antitop quark pair at the (High-Luminosity) LHC. Compared to inclusive searches for a displaced vertex, top-associated signals offer new trigger options and an extra handle to suppress background. We design a search strategy for a displaced di-muon vertex in the tracking detectors, in association with a reconstructed top-antitop pair. For axion-like particles with masses above the di-muon threshold, we find that the (High-Luminosity) LHC can probe effective top-quark couplings as small as $|c_{tt}|/f_a = 0.03(0.002)/$TeV and proper decay lengths as long as $20(300)$ m, assuming a cross section of $1$ fb, with data corresponding to an integrated luminosity of 150 fb$^{-1}$ (3 ab$^{-1}$). Our predictions suggest that searches for top-associated displaced di-muons will explore new terrain in the current sensitivity gap between searches for prompt di-muons and missing energy. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.08686v2-abstract-full').style.display = 'none'; document.getElementById('2306.08686v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> DESY-23-088, Nikhef-2023-006 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. High Energ. Phys. 2023, 138 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2209.13128">arXiv:2209.13128</a> <span> [<a href="https://arxiv.org/pdf/2209.13128">pdf</a>, <a href="https://arxiv.org/format/2209.13128">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 - Phenomenology">hep-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"> Report of the Topical Group on Physics Beyond the Standard Model at Energy Frontier for Snowmass 2021 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Bose%2C+T">Tulika Bose</a>, <a href="/search/hep-ph?searchtype=author&query=Boveia%2C+A">Antonio Boveia</a>, <a href="/search/hep-ph?searchtype=author&query=Doglioni%2C+C">Caterina Doglioni</a>, <a href="/search/hep-ph?searchtype=author&query=Griso%2C+S+P">Simone Pagan Griso</a>, <a href="/search/hep-ph?searchtype=author&query=Hirschauer%2C+J">James Hirschauer</a>, <a href="/search/hep-ph?searchtype=author&query=Lipeles%2C+E">Elliot Lipeles</a>, <a href="/search/hep-ph?searchtype=author&query=Liu%2C+Z">Zhen Liu</a>, <a href="/search/hep-ph?searchtype=author&query=Shah%2C+N+R">Nausheen R. Shah</a>, <a href="/search/hep-ph?searchtype=author&query=Wang%2C+L">Lian-Tao Wang</a>, <a href="/search/hep-ph?searchtype=author&query=Agashe%2C+K">Kaustubh Agashe</a>, <a href="/search/hep-ph?searchtype=author&query=Alimena%2C+J">Juliette Alimena</a>, <a href="/search/hep-ph?searchtype=author&query=Baum%2C+S">Sebastian Baum</a>, <a href="/search/hep-ph?searchtype=author&query=Berkat%2C+M">Mohamed Berkat</a>, <a href="/search/hep-ph?searchtype=author&query=Black%2C+K">Kevin Black</a>, <a href="/search/hep-ph?searchtype=author&query=Gardner%2C+G">Gwen Gardner</a>, <a href="/search/hep-ph?searchtype=author&query=Gherghetta%2C+T">Tony Gherghetta</a>, <a href="/search/hep-ph?searchtype=author&query=Greaves%2C+J">Josh Greaves</a>, <a href="/search/hep-ph?searchtype=author&query=Haehn%2C+M">Maxx Haehn</a>, <a href="/search/hep-ph?searchtype=author&query=Harris%2C+P+C">Phil C. Harris</a>, <a href="/search/hep-ph?searchtype=author&query=Harris%2C+R">Robert Harris</a>, <a href="/search/hep-ph?searchtype=author&query=Hogan%2C+J">Julie Hogan</a>, <a href="/search/hep-ph?searchtype=author&query=Jayawardana%2C+S">Suneth Jayawardana</a>, <a href="/search/hep-ph?searchtype=author&query=Kahn%2C+A">Abraham Kahn</a>, <a href="/search/hep-ph?searchtype=author&query=Kalinowski%2C+J">Jan Kalinowski</a>, <a href="/search/hep-ph?searchtype=author&query=Knapen%2C+S">Simon Knapen</a> , et al. (297 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="2209.13128v2-abstract-short" style="display: inline;"> This is the Snowmass2021 Energy Frontier (EF) Beyond the Standard Model (BSM) report. It combines the EF topical group reports of EF08 (Model-specific explorations), EF09 (More general explorations), and EF10 (Dark Matter at Colliders). The report includes a general introduction to BSM motivations and the comparative prospects for proposed future experiments for a broad range of potential BSM mode… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.13128v2-abstract-full').style.display = 'inline'; document.getElementById('2209.13128v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2209.13128v2-abstract-full" style="display: none;"> This is the Snowmass2021 Energy Frontier (EF) Beyond the Standard Model (BSM) report. It combines the EF topical group reports of EF08 (Model-specific explorations), EF09 (More general explorations), and EF10 (Dark Matter at Colliders). The report includes a general introduction to BSM motivations and the comparative prospects for proposed future experiments for a broad range of potential BSM models and signatures, including compositeness, SUSY, leptoquarks, more general new bosons and fermions, long-lived particles, dark matter, charged-lepton flavor violation, and anomaly detection. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.13128v2-abstract-full').style.display = 'none'; document.getElementById('2209.13128v2-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 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 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">108 pages + 38 pages references and appendix, 37 figures, Report of the Topical Group on Beyond the Standard Model Physics at Energy Frontier for Snowmass 2021. The first nine authors are the Conveners, with Contributions from the other authors</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.07316">arXiv:2203.07316</a> <span> [<a href="https://arxiv.org/pdf/2203.07316">pdf</a>, <a href="https://arxiv.org/format/2203.07316">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> </div> <p class="title is-5 mathjax"> The Road Ahead for CODEX-b </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Aielli%2C+G">Giulio Aielli</a>, <a href="/search/hep-ph?searchtype=author&query=Alimena%2C+J">Juliette Alimena</a>, <a href="/search/hep-ph?searchtype=author&query=Beacham%2C+J">James Beacham</a>, <a href="/search/hep-ph?searchtype=author&query=Ben-Haim%2C+E">Eli Ben-Haim</a>, <a href="/search/hep-ph?searchtype=author&query=Borsato%2C+M">Martino Borsato</a>, <a href="/search/hep-ph?searchtype=author&query=Charles%2C+M+J">Matthew John Charles</a>, <a href="/search/hep-ph?searchtype=author&query=Vidal%2C+X+C">Xabier Cid Vidal</a>, <a href="/search/hep-ph?searchtype=author&query=Coco%2C+V">Victor Coco</a>, <a href="/search/hep-ph?searchtype=author&query=De+Roeck%2C+A">Albert De Roeck</a>, <a href="/search/hep-ph?searchtype=author&query=Dey%2C+B">Biplab Dey</a>, <a href="/search/hep-ph?searchtype=author&query=Dumps%2C+R">Raphael Dumps</a>, <a href="/search/hep-ph?searchtype=author&query=Gligorov%2C+V+V">Vladimir V. Gligorov</a>, <a href="/search/hep-ph?searchtype=author&query=Suarez%2C+R+G">Rebeca Gonzalez Suarez</a>, <a href="/search/hep-ph?searchtype=author&query=Gorordo%2C+T">Thomas Gorordo</a>, <a href="/search/hep-ph?searchtype=author&query=Henry%2C+L">Louis Henry</a>, <a href="/search/hep-ph?searchtype=author&query=Ilten%2C+P">Philip Ilten</a>, <a href="/search/hep-ph?searchtype=author&query=Johnson%2C+D">Daniel Johnson</a>, <a href="/search/hep-ph?searchtype=author&query=Knapen%2C+S">Simon Knapen</a>, <a href="/search/hep-ph?searchtype=author&query=Dortz%2C+O+L">Olivier Le Dortz</a>, <a href="/search/hep-ph?searchtype=author&query=Soli%C3%B1o%2C+S+L">Saul L贸pez Soli帽o</a>, <a href="/search/hep-ph?searchtype=author&query=Momb%C3%A4cher%2C+T">Titus Momb盲cher</a>, <a href="/search/hep-ph?searchtype=author&query=Nachman%2C+B">Benjamin Nachman</a>, <a href="/search/hep-ph?searchtype=author&query=Northacker%2C+D+T">David T. Northacker</a>, <a href="/search/hep-ph?searchtype=author&query=Papucci%2C+M">Michele Papucci</a>, <a href="/search/hep-ph?searchtype=author&query=P%C3%A1sztor%2C+G">Gabriella P谩sztor</a> , et al. (14 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="2203.07316v1-abstract-short" style="display: inline;"> In this Snowmass contribution we present a comprehensive status update on the progress and plans for the proposed CODEX-b detector, intended to search for long-lived particles beyond the Standard Model. We review the physics case for the proposal and present recent progress on optimization strategies for the detector and shielding design, as well as the development of new fast and full simulation… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.07316v1-abstract-full').style.display = 'inline'; document.getElementById('2203.07316v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.07316v1-abstract-full" style="display: none;"> In this Snowmass contribution we present a comprehensive status update on the progress and plans for the proposed CODEX-b detector, intended to search for long-lived particles beyond the Standard Model. We review the physics case for the proposal and present recent progress on optimization strategies for the detector and shielding design, as well as the development of new fast and full simulation frameworks. A summary of the technical design for a smaller demonstrator detector (CODEX-$尾$) for the upcoming Run~3 of the LHC is also discussed, alongside the road towards realization of the full experiment at the High-Luminosity LHC. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.07316v1-abstract-full').style.display = 'none'; document.getElementById('2203.07316v1-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 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">13 pages, 13 figures, Snowmass contribution</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.05502">arXiv:2203.05502</a> <span> [<a href="https://arxiv.org/pdf/2203.05502">pdf</a>, <a href="https://arxiv.org/format/2203.05502">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</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/10.3389/fphy.2022.967881">10.3389/fphy.2022.967881 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Searches for Long-Lived Particles at the Future FCC-ee </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Alimena%2C+J">J. Alimena</a>, <a href="/search/hep-ph?searchtype=author&query=Azzi%2C+P">P. Azzi</a>, <a href="/search/hep-ph?searchtype=author&query=Bauer%2C+M">M. Bauer</a>, <a href="/search/hep-ph?searchtype=author&query=Blondel%2C+A">A. Blondel</a>, <a href="/search/hep-ph?searchtype=author&query=Drewes%2C+M">M. Drewes</a>, <a href="/search/hep-ph?searchtype=author&query=Suarez%2C+R+G">R. Gonzalez Suarez</a>, <a href="/search/hep-ph?searchtype=author&query=Klaric%2C+J">J. Klaric</a>, <a href="/search/hep-ph?searchtype=author&query=Kulkarni%2C+S">S. Kulkarni</a>, <a href="/search/hep-ph?searchtype=author&query=Mikulenko%2C+O">O. Mikulenko</a>, <a href="/search/hep-ph?searchtype=author&query=Neubert%2C+M">M. Neubert</a>, <a href="/search/hep-ph?searchtype=author&query=Ovchynnikov%2C+M">M. Ovchynnikov</a>, <a href="/search/hep-ph?searchtype=author&query=Rizzi%2C+C">C. Rizzi</a>, <a href="/search/hep-ph?searchtype=author&query=Ruiz%2C+R">R. Ruiz</a>, <a href="/search/hep-ph?searchtype=author&query=Rygaard%2C+L">L. Rygaard</a>, <a href="/search/hep-ph?searchtype=author&query=Sfyrla%2C+A">A. Sfyrla</a>, <a href="/search/hep-ph?searchtype=author&query=Sharma%2C+T">T. Sharma</a>, <a href="/search/hep-ph?searchtype=author&query=Thamm%2C+A">A. Thamm</a>, <a href="/search/hep-ph?searchtype=author&query=Verhaaren%2C+C+B">C. B. Verhaaren</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2203.05502v4-abstract-short" style="display: inline;"> The electron-positron stage of the Future Circular Collider, FCC-ee, is a frontier factory for Higgs, top, electroweak, and flavour physics. It is designed to operate in a 100 km circular tunnel built at CERN, and will serve as the first step towards $\geq$ 100 TeV proton-proton collisions. In addition to an essential and unique Higgs program, it offers powerful opportunities to discover direct or… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.05502v4-abstract-full').style.display = 'inline'; document.getElementById('2203.05502v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.05502v4-abstract-full" style="display: none;"> The electron-positron stage of the Future Circular Collider, FCC-ee, is a frontier factory for Higgs, top, electroweak, and flavour physics. It is designed to operate in a 100 km circular tunnel built at CERN, and will serve as the first step towards $\geq$ 100 TeV proton-proton collisions. In addition to an essential and unique Higgs program, it offers powerful opportunities to discover direct or indirect evidence of physics beyond the Standard Model. Direct searches for long-lived particles at FCC-ee could be particularly fertile in the high-luminosity $Z$ run, where $5\times 10^{12}$ $Z$ bosons are anticipated to be produced for the configuration with two interaction points. The high statistics of Higgs bosons, $W$ bosons and top quarks in very clean experimental conditions could offer additional opportunities at other collision energies. Three physics cases producing long-lived signatures at FCC-ee are highlighted and studied in this paper: heavy neutral leptons (HNLs), axion-like particles (ALPs), and exotic decays of the Higgs boson. These searches motivate out-of-the-box optimization of experimental conditions and analysis techniques, that could lead to improvements in other physics searches. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.05502v4-abstract-full').style.display = 'none'; document.getElementById('2203.05502v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 September, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Contribution to Snowmass 2021</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Front. Phys. 10:967881 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2110.14675">arXiv:2110.14675</a> <span> [<a href="https://arxiv.org/pdf/2110.14675">pdf</a>, <a href="https://arxiv.org/format/2110.14675">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> </div> </div> <p class="title is-5 mathjax"> Review of opportunities for new long-lived particle triggers in Run 3 of the Large Hadron Collider </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Alimena%2C+J">Juliette Alimena</a>, <a href="/search/hep-ph?searchtype=author&query=Beacham%2C+J">James Beacham</a>, <a href="/search/hep-ph?searchtype=author&query=Blekman%2C+F">Freya Blekman</a>, <a href="/search/hep-ph?searchtype=author&query=Vidal%2C+A+C">Adri谩n Casais Vidal</a>, <a href="/search/hep-ph?searchtype=author&query=Vidal%2C+X+C">Xabier Cid Vidal</a>, <a href="/search/hep-ph?searchtype=author&query=Citron%2C+M">Matthew Citron</a>, <a href="/search/hep-ph?searchtype=author&query=Curtin%2C+D">David Curtin</a>, <a href="/search/hep-ph?searchtype=author&query=De+Roeck%2C+A">Albert De Roeck</a>, <a href="/search/hep-ph?searchtype=author&query=Desai%2C+N">Nishita Desai</a>, <a href="/search/hep-ph?searchtype=author&query=Di+Petrillo%2C+K+F">Karri Folan Di Petrillo</a>, <a href="/search/hep-ph?searchtype=author&query=Gershtein%2C+Y">Yuri Gershtein</a>, <a href="/search/hep-ph?searchtype=author&query=Henry%2C+L">Louis Henry</a>, <a href="/search/hep-ph?searchtype=author&query=Holmes%2C+T">Tova Holmes</a>, <a href="/search/hep-ph?searchtype=author&query=Jashal%2C+B">Brij Jashal</a>, <a href="/search/hep-ph?searchtype=author&query=Ilten%2C+P+J">Philip James Ilten</a>, <a href="/search/hep-ph?searchtype=author&query=Mehlhase%2C+S">Sascha Mehlhase</a>, <a href="/search/hep-ph?searchtype=author&query=Berlingen%2C+J+M">Javier Montejo Berlingen</a>, <a href="/search/hep-ph?searchtype=author&query=Oyanguren%2C+A">Arantza Oyanguren</a>, <a href="/search/hep-ph?searchtype=author&query=Punzi%2C+G">Giovanni Punzi</a>, <a href="/search/hep-ph?searchtype=author&query=Rangel%2C+M+S">Murilo Santana Rangel</a>, <a href="/search/hep-ph?searchtype=author&query=Redi%2C+F+L">Federico Leo Redi</a>, <a href="/search/hep-ph?searchtype=author&query=Sestini%2C+L">Lorenzo Sestini</a>, <a href="/search/hep-ph?searchtype=author&query=Torro%2C+E">Emma Torro</a>, <a href="/search/hep-ph?searchtype=author&query=Sierra%2C+C+V">Carlos V谩zquez Sierra</a>, <a href="/search/hep-ph?searchtype=author&query=van+Veghel%2C+M">Maarten van Veghel</a> , et al. (53 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="2110.14675v1-abstract-short" style="display: inline;"> Long-lived particles (LLPs) are highly motivated signals of physics Beyond the Standard Model (BSM) with great discovery potential and unique experimental challenges. The LLP search programme made great advances during Run 2 of the Large Hadron Collider (LHC), but many important regions of signal space remain unexplored. Dedicated triggers are crucial to improve the potential of LLP searches, and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.14675v1-abstract-full').style.display = 'inline'; document.getElementById('2110.14675v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2110.14675v1-abstract-full" style="display: none;"> Long-lived particles (LLPs) are highly motivated signals of physics Beyond the Standard Model (BSM) with great discovery potential and unique experimental challenges. The LLP search programme made great advances during Run 2 of the Large Hadron Collider (LHC), but many important regions of signal space remain unexplored. Dedicated triggers are crucial to improve the potential of LLP searches, and their development and expansion is necessary for the full exploitation of the new data. The public discussion of triggers has therefore been a relevant theme in the recent LLP literature, in the meetings of the LLP@LHC Community workshop and in the respective experiments. This paper documents the ideas collected during talks and discussions at these Workshops, benefiting as well from the ideas under development by the trigger community within the experimental collaborations. We summarise the theoretical motivations of various LLP scenarios leading to highly elusive signals, reviewing concrete ideas for triggers that could greatly extend the reach of the LHC experiments. We thus expect this document to encourage further thinking for both the phenomenological and experimental communities, as a stepping stone to further develop the LLP@LHC physics programme. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.14675v1-abstract-full').style.display = 'none'; document.getElementById('2110.14675v1-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> 27 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">Produced for the LPCC Long-Lived Particles Working Group. 43 pages, 1 figure</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-LPCC-2021-01 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2110.13837">arXiv:2110.13837</a> <span> [<a href="https://arxiv.org/pdf/2110.13837">pdf</a>, <a href="https://arxiv.org/format/2110.13837">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 - Phenomenology">hep-ph</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/PhysRevD.105.L051701">10.1103/PhysRevD.105.L051701 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Detecting long-lived particles trapped in detector material at the LHC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Kieseler%2C+J">Jan Kieseler</a>, <a href="/search/hep-ph?searchtype=author&query=Alimena%2C+J">Juliette Alimena</a>, <a href="/search/hep-ph?searchtype=author&query=Simms%2C+J">Jasmine Simms</a>, <a href="/search/hep-ph?searchtype=author&query=Aarrestad%2C+T">Thea Aarrestad</a>, <a href="/search/hep-ph?searchtype=author&query=Pierini%2C+M">Maurizio Pierini</a>, <a href="/search/hep-ph?searchtype=author&query=Kish%2C+A">Alexander Kish</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="2110.13837v2-abstract-short" style="display: inline;"> We propose to implement a two-stage detection strategy for exotic long-lived particles that could be produced at the CERN LHC, become trapped in detector material, and decay later. The proposed strategy relies on an array of metal rods, combined to form a high-density target. In a first stage, the rods are exposed to radiation from LHC collisions in one of the experimental caverns. In a second sta… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.13837v2-abstract-full').style.display = 'inline'; document.getElementById('2110.13837v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2110.13837v2-abstract-full" style="display: none;"> We propose to implement a two-stage detection strategy for exotic long-lived particles that could be produced at the CERN LHC, become trapped in detector material, and decay later. The proposed strategy relies on an array of metal rods, combined to form a high-density target. In a first stage, the rods are exposed to radiation from LHC collisions in one of the experimental caverns. In a second stage, they are individually immersed in liquid argon in a different experimental hall, where out-of-time decays could produce a detectable signal. Using a benchmark case of long-lived gluino pair production, we show that this experiment would be sensitive to a wide range of masses. Such an experiment would have unique sensitivity to gluino-neutralino mass splittings down to 3 GeV, in previously uncovered particle lifetimes ranging from days to years. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.13837v2-abstract-full').style.display = 'none'; document.getElementById('2110.13837v2-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 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 105 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1903.04497">arXiv:1903.04497</a> <span> [<a href="https://arxiv.org/pdf/1903.04497">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </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/ab4574">10.1088/1361-6471/ab4574 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Searching for long-lived particles beyond the Standard Model at the Large Hadron Collider </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Alimena%2C+J">Juliette Alimena</a>, <a href="/search/hep-ph?searchtype=author&query=Beacham%2C+J">James Beacham</a>, <a href="/search/hep-ph?searchtype=author&query=Borsato%2C+M">Martino Borsato</a>, <a href="/search/hep-ph?searchtype=author&query=Cheng%2C+Y">Yangyang Cheng</a>, <a href="/search/hep-ph?searchtype=author&query=Vidal%2C+X+C">Xabier Cid Vidal</a>, <a href="/search/hep-ph?searchtype=author&query=Cottin%2C+G">Giovanna Cottin</a>, <a href="/search/hep-ph?searchtype=author&query=De+Roeck%2C+A">Albert De Roeck</a>, <a href="/search/hep-ph?searchtype=author&query=Desai%2C+N">Nishita Desai</a>, <a href="/search/hep-ph?searchtype=author&query=Curtin%2C+D">David Curtin</a>, <a href="/search/hep-ph?searchtype=author&query=Evans%2C+J+A">Jared A. Evans</a>, <a href="/search/hep-ph?searchtype=author&query=Knapen%2C+S">Simon Knapen</a>, <a href="/search/hep-ph?searchtype=author&query=Kraml%2C+S">Sabine Kraml</a>, <a href="/search/hep-ph?searchtype=author&query=Lessa%2C+A">Andre Lessa</a>, <a href="/search/hep-ph?searchtype=author&query=Liu%2C+Z">Zhen Liu</a>, <a href="/search/hep-ph?searchtype=author&query=Mehlhase%2C+S">Sascha Mehlhase</a>, <a href="/search/hep-ph?searchtype=author&query=Ramsey-Musolf%2C+M+J">Michael J. Ramsey-Musolf</a>, <a href="/search/hep-ph?searchtype=author&query=Russell%2C+H">Heather Russell</a>, <a href="/search/hep-ph?searchtype=author&query=Shelton%2C+J">Jessie Shelton</a>, <a href="/search/hep-ph?searchtype=author&query=Shuve%2C+B">Brian Shuve</a>, <a href="/search/hep-ph?searchtype=author&query=Verducci%2C+M">Monica Verducci</a>, <a href="/search/hep-ph?searchtype=author&query=Zurita%2C+J">Jose Zurita</a>, <a href="/search/hep-ph?searchtype=author&query=Adams%2C+T">Todd Adams</a>, <a href="/search/hep-ph?searchtype=author&query=Adersberger%2C+M">Michael Adersberger</a>, <a href="/search/hep-ph?searchtype=author&query=Alpigiani%2C+C">Cristiano Alpigiani</a>, <a href="/search/hep-ph?searchtype=author&query=Apresyan%2C+A">Artur Apresyan</a> , et al. (176 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="1903.04497v1-abstract-short" style="display: inline;"> Particles beyond the Standard Model (SM) can generically have lifetimes that are long compared to SM particles at the weak scale. When produced at experiments such as the Large Hadron Collider (LHC) at CERN, these long-lived particles (LLPs) can decay far from the interaction vertex of the primary proton-proton collision. Such LLP signatures are distinct from those of promptly decaying particles t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1903.04497v1-abstract-full').style.display = 'inline'; document.getElementById('1903.04497v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1903.04497v1-abstract-full" style="display: none;"> Particles beyond the Standard Model (SM) can generically have lifetimes that are long compared to SM particles at the weak scale. When produced at experiments such as the Large Hadron Collider (LHC) at CERN, these long-lived particles (LLPs) can decay far from the interaction vertex of the primary proton-proton collision. Such LLP signatures are distinct from those of promptly decaying particles that are targeted by the majority of searches for new physics at the LHC, often requiring customized techniques to identify, for example, significantly displaced decay vertices, tracks with atypical properties, and short track segments. Given their non-standard nature, a comprehensive overview of LLP signatures at the LHC is beneficial to ensure that possible avenues of the discovery of new physics are not overlooked. Here we report on the joint work of a community of theorists and experimentalists with the ATLAS, CMS, and LHCb experiments --- as well as those working on dedicated experiments such as MoEDAL, milliQan, MATHUSLA, CODEX-b, and FASER --- to survey the current state of LLP searches at the LHC, and to chart a path for the development of LLP searches into the future, both in the upcoming Run 3 and at the High-Luminosity LHC. The work is organized around the current and future potential capabilities of LHC experiments to generally discover new LLPs, and takes a signature-based approach to surveying classes of models that give rise to LLPs rather than emphasizing any particular theory motivation. We develop a set of simplified models; assess the coverage of current searches; document known, often unexpected backgrounds; explore the capabilities of proposed detector upgrades; provide recommendations for the presentation of search results; and look towards the newest frontiers, namely high-multiplicity "dark showers", highlighting opportunities for expanding the LHC reach for these signals. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1903.04497v1-abstract-full').style.display = 'none'; document.getElementById('1903.04497v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 March, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2019. </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. 47 090501 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1902.04070">arXiv:1902.04070</a> <span> [<a href="https://arxiv.org/pdf/1902.04070">pdf</a>, <a href="https://arxiv.org/format/1902.04070">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 - Phenomenology">hep-ph</span> </div> </div> <p class="title is-5 mathjax"> Standard Model Physics at the HL-LHC and HE-LHC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Azzi%2C+P">P. Azzi</a>, <a href="/search/hep-ph?searchtype=author&query=Farry%2C+S">S. Farry</a>, <a href="/search/hep-ph?searchtype=author&query=Nason%2C+P">P. Nason</a>, <a href="/search/hep-ph?searchtype=author&query=Tricoli%2C+A">A. Tricoli</a>, <a href="/search/hep-ph?searchtype=author&query=Zeppenfeld%2C+D">D. Zeppenfeld</a>, <a href="/search/hep-ph?searchtype=author&query=Khalek%2C+R+A">R. Abdul Khalek</a>, <a href="/search/hep-ph?searchtype=author&query=Alimena%2C+J">J. Alimena</a>, <a href="/search/hep-ph?searchtype=author&query=Andari%2C+N">N. Andari</a>, <a href="/search/hep-ph?searchtype=author&query=Bella%2C+L+A">L. Aperio Bella</a>, <a href="/search/hep-ph?searchtype=author&query=Armbruster%2C+A+J">A. J. Armbruster</a>, <a href="/search/hep-ph?searchtype=author&query=Baglio%2C+J">J. Baglio</a>, <a href="/search/hep-ph?searchtype=author&query=Bailey%2C+S">S. Bailey</a>, <a href="/search/hep-ph?searchtype=author&query=Bakos%2C+E">E. Bakos</a>, <a href="/search/hep-ph?searchtype=author&query=Bakshi%2C+A">A. Bakshi</a>, <a href="/search/hep-ph?searchtype=author&query=Baldenegro%2C+C">C. Baldenegro</a>, <a href="/search/hep-ph?searchtype=author&query=Balli%2C+F">F. Balli</a>, <a href="/search/hep-ph?searchtype=author&query=Barker%2C+A">A. Barker</a>, <a href="/search/hep-ph?searchtype=author&query=Barter%2C+W">W. Barter</a>, <a href="/search/hep-ph?searchtype=author&query=de+Blas%2C+J">J. de Blas</a>, <a href="/search/hep-ph?searchtype=author&query=Blekman%2C+F">F. Blekman</a>, <a href="/search/hep-ph?searchtype=author&query=Bloch%2C+D">D. Bloch</a>, <a href="/search/hep-ph?searchtype=author&query=Bodek%2C+A">A. Bodek</a>, <a href="/search/hep-ph?searchtype=author&query=Boonekamp%2C+M">M. Boonekamp</a>, <a href="/search/hep-ph?searchtype=author&query=Boos%2C+E">E. Boos</a>, <a href="/search/hep-ph?searchtype=author&query=Sola%2C+J+D+B">J. D. Bossio Sola</a> , et al. (201 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="1902.04070v3-abstract-short" style="display: inline;"> The successful operation of the Large Hadron Collider (LHC) and the excellent performance of the ATLAS, CMS, LHCb and ALICE detectors in Run-1 and Run-2 with $pp$ collisions at center-of-mass energies of 7, 8 and 13 TeV as well as the giant leap in precision calculations and modeling of fundamental interactions at hadron colliders have allowed an extraordinary breadth of physics studies including… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1902.04070v3-abstract-full').style.display = 'inline'; document.getElementById('1902.04070v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1902.04070v3-abstract-full" style="display: none;"> The successful operation of the Large Hadron Collider (LHC) and the excellent performance of the ATLAS, CMS, LHCb and ALICE detectors in Run-1 and Run-2 with $pp$ collisions at center-of-mass energies of 7, 8 and 13 TeV as well as the giant leap in precision calculations and modeling of fundamental interactions at hadron colliders have allowed an extraordinary breadth of physics studies including precision measurements of a variety physics processes. The LHC results have so far confirmed the validity of the Standard Model of particle physics up to unprecedented energy scales and with great precision in the sectors of strong and electroweak interactions as well as flavour physics, for instance in top quark physics. The upgrade of the LHC to a High Luminosity phase (HL-LHC) at 14 TeV center-of-mass energy with 3 ab$^{-1}$ of integrated luminosity will probe the Standard Model with even greater precision and will extend the sensitivity to possible anomalies in the Standard Model, thanks to a ten-fold larger data set, upgraded detectors and expected improvements in the theoretical understanding. This document summarises the physics reach of the HL-LHC in the realm of strong and electroweak interactions and top quark physics, and provides a glimpse of the potential of a possible further upgrade of the LHC to a 27 TeV $pp$ collider, the High-Energy LHC (HE-LHC), assumed to accumulate an integrated luminosity of 15 ab$^{-1}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1902.04070v3-abstract-full').style.display = 'none'; document.getElementById('1902.04070v3-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 December, 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">Comments:</span> <span class="has-text-grey-dark mathjax">Report from Working Group 1 on the Physics of the HL-LHC, and Perspectives at the HE-LHC</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-LPCC-2018-03 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1902.00134">arXiv:1902.00134</a> <span> [<a href="https://arxiv.org/pdf/1902.00134">pdf</a>, <a href="https://arxiv.org/format/1902.00134">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 - Phenomenology">hep-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"> Higgs Physics at the HL-LHC and HE-LHC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Cepeda%2C+M">M. Cepeda</a>, <a href="/search/hep-ph?searchtype=author&query=Gori%2C+S">S. Gori</a>, <a href="/search/hep-ph?searchtype=author&query=Ilten%2C+P">P. Ilten</a>, <a href="/search/hep-ph?searchtype=author&query=Kado%2C+M">M. Kado</a>, <a href="/search/hep-ph?searchtype=author&query=Riva%2C+F">F. Riva</a>, <a href="/search/hep-ph?searchtype=author&query=Khalek%2C+R+A">R. Abdul Khalek</a>, <a href="/search/hep-ph?searchtype=author&query=Aboubrahim%2C+A">A. Aboubrahim</a>, <a href="/search/hep-ph?searchtype=author&query=Alimena%2C+J">J. Alimena</a>, <a href="/search/hep-ph?searchtype=author&query=Alioli%2C+S">S. Alioli</a>, <a href="/search/hep-ph?searchtype=author&query=Alves%2C+A">A. Alves</a>, <a href="/search/hep-ph?searchtype=author&query=Asawatangtrakuldee%2C+C">C. Asawatangtrakuldee</a>, <a href="/search/hep-ph?searchtype=author&query=Azatov%2C+A">A. Azatov</a>, <a href="/search/hep-ph?searchtype=author&query=Azzi%2C+P">P. Azzi</a>, <a href="/search/hep-ph?searchtype=author&query=Bailey%2C+S">S. Bailey</a>, <a href="/search/hep-ph?searchtype=author&query=Banerjee%2C+S">S. Banerjee</a>, <a href="/search/hep-ph?searchtype=author&query=Barberio%2C+E+L">E. L. Barberio</a>, <a href="/search/hep-ph?searchtype=author&query=Barducci%2C+D">D. Barducci</a>, <a href="/search/hep-ph?searchtype=author&query=Barone%2C+G">G. Barone</a>, <a href="/search/hep-ph?searchtype=author&query=Bauer%2C+M">M. Bauer</a>, <a href="/search/hep-ph?searchtype=author&query=Bautista%2C+C">C. Bautista</a>, <a href="/search/hep-ph?searchtype=author&query=Bechtle%2C+P">P. Bechtle</a>, <a href="/search/hep-ph?searchtype=author&query=Becker%2C+K">K. Becker</a>, <a href="/search/hep-ph?searchtype=author&query=Benaglia%2C+A">A. Benaglia</a>, <a href="/search/hep-ph?searchtype=author&query=Bengala%2C+M">M. Bengala</a>, <a href="/search/hep-ph?searchtype=author&query=Berger%2C+N">N. Berger</a> , et al. (352 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="1902.00134v2-abstract-short" style="display: inline;"> The discovery of the Higgs boson in 2012, by the ATLAS and CMS experiments, was a success achieved with only a percent of the entire dataset foreseen for the LHC. It opened a landscape of possibilities in the study of Higgs boson properties, Electroweak Symmetry breaking and the Standard Model in general, as well as new avenues in probing new physics beyond the Standard Model. Six years after the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1902.00134v2-abstract-full').style.display = 'inline'; document.getElementById('1902.00134v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1902.00134v2-abstract-full" style="display: none;"> The discovery of the Higgs boson in 2012, by the ATLAS and CMS experiments, was a success achieved with only a percent of the entire dataset foreseen for the LHC. It opened a landscape of possibilities in the study of Higgs boson properties, Electroweak Symmetry breaking and the Standard Model in general, as well as new avenues in probing new physics beyond the Standard Model. Six years after the discovery, with a conspicuously larger dataset collected during LHC Run 2 at a 13 TeV centre-of-mass energy, the theory and experimental particle physics communities have started a meticulous exploration of the potential for precision measurements of its properties. This includes studies of Higgs boson production and decays processes, the search for rare decays and production modes, high energy observables, and searches for an extended electroweak symmetry breaking sector. This report summarises the potential reach and opportunities in Higgs physics during the High Luminosity phase of the LHC, with an expected dataset of pp collisions at 14 TeV, corresponding to an integrated luminosity of 3 ab$^{-1}$. These studies are performed in light of the most recent analyses from LHC collaborations and the latest theoretical developments. The potential of an LHC upgrade, colliding protons at a centre-of-mass energy of 27 TeV and producing a dataset corresponding to an integrated luminosity of 15 ab$^{-1}$, is also discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1902.00134v2-abstract-full').style.display = 'none'; document.getElementById('1902.00134v2-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 March, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 31 January, 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">Comments:</span> <span class="has-text-grey-dark mathjax">Report from Working Group 2 on the Physics of the HL-LHC, and Perspectives at the HE-LHC, 364 pages</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-LPCC-2018-04 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1812.07831">arXiv:1812.07831</a> <span> [<a href="https://arxiv.org/pdf/1812.07831">pdf</a>, <a href="https://arxiv.org/format/1812.07831">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 - Phenomenology">hep-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"> Beyond the Standard Model Physics at the HL-LHC and HE-LHC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Vidal%2C+X+C">X. Cid Vidal</a>, <a href="/search/hep-ph?searchtype=author&query=D%27Onofrio%2C+M">M. D'Onofrio</a>, <a href="/search/hep-ph?searchtype=author&query=Fox%2C+P+J">P. J. Fox</a>, <a href="/search/hep-ph?searchtype=author&query=Torre%2C+R">R. Torre</a>, <a href="/search/hep-ph?searchtype=author&query=Ulmer%2C+K+A">K. A. Ulmer</a>, <a href="/search/hep-ph?searchtype=author&query=Aboubrahim%2C+A">A. Aboubrahim</a>, <a href="/search/hep-ph?searchtype=author&query=Albert%2C+A">A. Albert</a>, <a href="/search/hep-ph?searchtype=author&query=Alimena%2C+J">J. Alimena</a>, <a href="/search/hep-ph?searchtype=author&query=Allanach%2C+B+C">B. C. Allanach</a>, <a href="/search/hep-ph?searchtype=author&query=Alpigiani%2C+C">C. Alpigiani</a>, <a href="/search/hep-ph?searchtype=author&query=Altakach%2C+M">M. Altakach</a>, <a href="/search/hep-ph?searchtype=author&query=Amoroso%2C+S">S. Amoroso</a>, <a href="/search/hep-ph?searchtype=author&query=Anders%2C+J+K">J. K. Anders</a>, <a href="/search/hep-ph?searchtype=author&query=Araz%2C+J+Y">J. Y. Araz</a>, <a href="/search/hep-ph?searchtype=author&query=Arbey%2C+A">A. Arbey</a>, <a href="/search/hep-ph?searchtype=author&query=Azzi%2C+P">P. Azzi</a>, <a href="/search/hep-ph?searchtype=author&query=Babounikau%2C+I">I. Babounikau</a>, <a href="/search/hep-ph?searchtype=author&query=Baer%2C+H">H. Baer</a>, <a href="/search/hep-ph?searchtype=author&query=Baker%2C+M+J">M. J. Baker</a>, <a href="/search/hep-ph?searchtype=author&query=Barducci%2C+D">D. Barducci</a>, <a href="/search/hep-ph?searchtype=author&query=Barger%2C+V">V. Barger</a>, <a href="/search/hep-ph?searchtype=author&query=Baron%2C+O">O. Baron</a>, <a href="/search/hep-ph?searchtype=author&query=Navarro%2C+L+B">L. Barranco Navarro</a>, <a href="/search/hep-ph?searchtype=author&query=Battaglia%2C+M">M. Battaglia</a>, <a href="/search/hep-ph?searchtype=author&query=Bay%2C+A">A. Bay</a> , et al. (272 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="1812.07831v4-abstract-short" style="display: inline;"> This is the third out of five chapters of the final report [1] of the Workshop on Physics at HL-LHC, and perspectives on HE-LHC [2]. It is devoted to the study of the potential, in the search for Beyond the Standard Model (BSM) physics, of the High Luminosity (HL) phase of the LHC, defined as $3~\mathrm{ab}^{-1}$ of data taken at a centre-of-mass energy of $14~\mathrm{TeV}$, and of a possible futu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.07831v4-abstract-full').style.display = 'inline'; document.getElementById('1812.07831v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1812.07831v4-abstract-full" style="display: none;"> This is the third out of five chapters of the final report [1] of the Workshop on Physics at HL-LHC, and perspectives on HE-LHC [2]. It is devoted to the study of the potential, in the search for Beyond the Standard Model (BSM) physics, of the High Luminosity (HL) phase of the LHC, defined as $3~\mathrm{ab}^{-1}$ of data taken at a centre-of-mass energy of $14~\mathrm{TeV}$, and of a possible future upgrade, the High Energy (HE) LHC, defined as $15~\mathrm{ab}^{-1}$ of data at a centre-of-mass energy of $27~\mathrm{TeV}$. We consider a large variety of new physics models, both in a simplified model fashion and in a more model-dependent one. A long list of contributions from the theory and experimental (ATLAS, CMS, LHCb) communities have been collected and merged together to give a complete, wide, and consistent view of future prospects for BSM physics at the considered colliders. On top of the usual standard candles, such as supersymmetric simplified models and resonances, considered for the evaluation of future collider potentials, this report contains results on dark matter and dark sectors, long lived particles, leptoquarks, sterile neutrinos, axion-like particles, heavy scalars, vector-like quarks, and more. Particular attention is placed, especially in the study of the HL-LHC prospects, to the detector upgrades, the assessment of the future systematic uncertainties, and new experimental techniques. The general conclusion is that the HL-LHC, on top of allowing to extend the present LHC mass and coupling reach by $20-50\%$ on most new physics scenarios, will also be able to constrain, and potentially discover, new physics that is presently unconstrained. Moreover, compared to the HL-LHC, the reach in most observables will generally more than double at the HE-LHC, which may represent a good candidate future facility for a final test of TeV-scale new physics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.07831v4-abstract-full').style.display = 'none'; document.getElementById('1812.07831v4-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 August, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 December, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">Report from Working Group 3 on the Physics of the HL-LHC, and Perspectives at the HE-LHC; v2: final version updated with the latest contributions and summaries; 239 pages + refs; v3: typos and character misprint in Fig. 7.2 fixed; v4: added one missing author</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-LPCC-2018-05 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1812.07638">arXiv:1812.07638</a> <span> [<a href="https://arxiv.org/pdf/1812.07638">pdf</a>, <a href="https://arxiv.org/format/1812.07638">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 - Phenomenology">hep-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"> Opportunities in Flavour Physics at the HL-LHC and HE-LHC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Cerri%2C+A">A. Cerri</a>, <a href="/search/hep-ph?searchtype=author&query=Gligorov%2C+V+V">V. V. Gligorov</a>, <a href="/search/hep-ph?searchtype=author&query=Malvezzi%2C+S">S. Malvezzi</a>, <a href="/search/hep-ph?searchtype=author&query=Camalich%2C+J+M">J. Martin Camalich</a>, <a href="/search/hep-ph?searchtype=author&query=Zupan%2C+J">J. Zupan</a>, <a href="/search/hep-ph?searchtype=author&query=Akar%2C+S">S. Akar</a>, <a href="/search/hep-ph?searchtype=author&query=Alimena%2C+J">J. Alimena</a>, <a href="/search/hep-ph?searchtype=author&query=Allanach%2C+B+C">B. C. Allanach</a>, <a href="/search/hep-ph?searchtype=author&query=Altmannshofer%2C+W">W. Altmannshofer</a>, <a href="/search/hep-ph?searchtype=author&query=Anderlini%2C+L">L. Anderlini</a>, <a href="/search/hep-ph?searchtype=author&query=Archilli%2C+F">F. Archilli</a>, <a href="/search/hep-ph?searchtype=author&query=Azzi%2C+P">P. Azzi</a>, <a href="/search/hep-ph?searchtype=author&query=Banerjee%2C+S">S. Banerjee</a>, <a href="/search/hep-ph?searchtype=author&query=Barter%2C+W">W. Barter</a>, <a href="/search/hep-ph?searchtype=author&query=Barton%2C+A+E">A. E. Barton</a>, <a href="/search/hep-ph?searchtype=author&query=Bauer%2C+M">M. Bauer</a>, <a href="/search/hep-ph?searchtype=author&query=Belyaev%2C+I">I. Belyaev</a>, <a href="/search/hep-ph?searchtype=author&query=Benson%2C+S">S. Benson</a>, <a href="/search/hep-ph?searchtype=author&query=Bettler%2C+M">M. Bettler</a>, <a href="/search/hep-ph?searchtype=author&query=Bhattacharya%2C+R">R. Bhattacharya</a>, <a href="/search/hep-ph?searchtype=author&query=Bifani%2C+S">S. Bifani</a>, <a href="/search/hep-ph?searchtype=author&query=Birnkraut%2C+A">A. Birnkraut</a>, <a href="/search/hep-ph?searchtype=author&query=Bishara%2C+F">F. Bishara</a>, <a href="/search/hep-ph?searchtype=author&query=Blake%2C+T">T. Blake</a>, <a href="/search/hep-ph?searchtype=author&query=Blusk%2C+S">S. Blusk</a> , et al. (278 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="1812.07638v2-abstract-short" style="display: inline;"> Motivated by the success of the flavour physics programme carried out over the last decade at the Large Hadron Collider (LHC), we characterize in detail the physics potential of its High-Luminosity and High-Energy upgrades in this domain of physics. We document the extraordinary breadth of the HL/HE-LHC programme enabled by a putative Upgrade II of the dedicated flavour physics experiment LHCb and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.07638v2-abstract-full').style.display = 'inline'; document.getElementById('1812.07638v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1812.07638v2-abstract-full" style="display: none;"> Motivated by the success of the flavour physics programme carried out over the last decade at the Large Hadron Collider (LHC), we characterize in detail the physics potential of its High-Luminosity and High-Energy upgrades in this domain of physics. We document the extraordinary breadth of the HL/HE-LHC programme enabled by a putative Upgrade II of the dedicated flavour physics experiment LHCb and the evolution of the established flavour physics role of the ATLAS and CMS general purpose experiments. We connect the dedicated flavour physics programme to studies of the top quark, Higgs boson, and direct high-$p_T$ searches for new particles and force carriers. We discuss the complementarity of their discovery potential for physics beyond the Standard Model, affirming the necessity to fully exploit the LHC's flavour physics potential throughout its upgrade eras. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.07638v2-abstract-full').style.display = 'none'; document.getElementById('1812.07638v2-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 February, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 December, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">Report from Working Group 4 on the Physics of the HL-LHC, and Perspectives at the HE-LHC, 292 pages</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1411.4413">arXiv:1411.4413</a> <span> [<a href="https://arxiv.org/pdf/1411.4413">pdf</a>, <a href="https://arxiv.org/format/1411.4413">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </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/10.1038/nature14474">10.1038/nature14474 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Observation of the rare $B^0_s\to渭^+渭^-$ decay from the combined analysis of CMS and LHCb data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=CMS%2C+T">The CMS</a>, <a href="/search/hep-ph?searchtype=author&query=Collaborations%2C+L">LHCb Collaborations</a>, <a href="/search/hep-ph?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ph?searchtype=author&query=Khachatryan%2C+V">V. Khachatryan</a>, <a href="/search/hep-ph?searchtype=author&query=Sirunyan%2C+A+M">A. M. Sirunyan</a>, <a href="/search/hep-ph?searchtype=author&query=Tumasyan%2C+A">A. Tumasyan</a>, <a href="/search/hep-ph?searchtype=author&query=Adam%2C+W">W. Adam</a>, <a href="/search/hep-ph?searchtype=author&query=Bergauer%2C+T">T. Bergauer</a>, <a href="/search/hep-ph?searchtype=author&query=Dragicevic%2C+M">M. Dragicevic</a>, <a href="/search/hep-ph?searchtype=author&query=Er%C3%B6%2C+J">J. Er枚</a>, <a href="/search/hep-ph?searchtype=author&query=Friedl%2C+M">M. Friedl</a>, <a href="/search/hep-ph?searchtype=author&query=Fr%C3%BChwirth%2C+R">R. Fr眉hwirth</a>, <a href="/search/hep-ph?searchtype=author&query=Ghete%2C+V+M">V. M. Ghete</a>, <a href="/search/hep-ph?searchtype=author&query=Hartl%2C+C">C. Hartl</a>, <a href="/search/hep-ph?searchtype=author&query=H%C3%B6rmann%2C+N">N. H枚rmann</a>, <a href="/search/hep-ph?searchtype=author&query=Hrubec%2C+J">J. Hrubec</a>, <a href="/search/hep-ph?searchtype=author&query=Jeitler%2C+M">M. Jeitler</a>, <a href="/search/hep-ph?searchtype=author&query=Kiesenhofer%2C+W">W. Kiesenhofer</a>, <a href="/search/hep-ph?searchtype=author&query=Kn%C3%BCnz%2C+V">V. Kn眉nz</a>, <a href="/search/hep-ph?searchtype=author&query=Krammer%2C+M">M. Krammer</a>, <a href="/search/hep-ph?searchtype=author&query=Kr%C3%A4tschmer%2C+I">I. Kr盲tschmer</a>, <a href="/search/hep-ph?searchtype=author&query=Liko%2C+D">D. Liko</a>, <a href="/search/hep-ph?searchtype=author&query=Mikulec%2C+I">I. Mikulec</a>, <a href="/search/hep-ph?searchtype=author&query=Rabady%2C+D">D. Rabady</a>, <a href="/search/hep-ph?searchtype=author&query=Rahbaran%2C+B">B. Rahbaran</a> , et al. (2807 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="1411.4413v2-abstract-short" style="display: inline;"> A joint measurement is presented of the branching fractions $B^0_s\to渭^+渭^-$ and $B^0\to渭^+渭^-$ in proton-proton collisions at the LHC by the CMS and LHCb experiments. The data samples were collected in 2011 at a centre-of-mass energy of 7 TeV, and in 2012 at 8 TeV. The combined analysis produces the first observation of the $B^0_s\to渭^+渭^-$ decay, with a statistical significance exceeding six sta… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1411.4413v2-abstract-full').style.display = 'inline'; document.getElementById('1411.4413v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1411.4413v2-abstract-full" style="display: none;"> A joint measurement is presented of the branching fractions $B^0_s\to渭^+渭^-$ and $B^0\to渭^+渭^-$ in proton-proton collisions at the LHC by the CMS and LHCb experiments. The data samples were collected in 2011 at a centre-of-mass energy of 7 TeV, and in 2012 at 8 TeV. The combined analysis produces the first observation of the $B^0_s\to渭^+渭^-$ decay, with a statistical significance exceeding six standard deviations, and the best measurement of its branching fraction so far. Furthermore, evidence for the $B^0\to渭^+渭^-$ decay is obtained with a statistical significance of three standard deviations. The branching fraction measurements are statistically compatible with SM predictions and impose stringent constraints on several theories beyond the SM. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1411.4413v2-abstract-full').style.display = 'none'; document.getElementById('1411.4413v2-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 August, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 November, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Correspondence should be addressed to cms-and-lhcb-publication-committees@cern.ch</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-PH-EP-2014-220, CMS-BPH-13-007, LHCb-PAPER-2014-049 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature 522, 68-72 (04 June 2015) </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 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