Searching for long-lived particles beyond the Standard Model at the Large Hadron Collider

Juliette Alimena, James Beacham, Martino Borsato, Yangyang Cheng, Xabier Cid Vidal, Giovanna Cottin, Albert De Roeck, Nishita Desai, David Curtin, Jared A. Evans, Simon Knapen, Sabine Kraml, Andre Lessa, Zhen Liu, Sascha Mehlhase, Michael J. Ramsey-Musolf, Heather Russell, Jessie Shelton, Brian Shuve, Monica VerducciJose Zurita, Todd Adams, Michael Adersberger, Cristiano Alpigiani, Artur Apresyan, Robert John Bainbridge, Varvara Batozskaya, Hugues Beauchesne, Lisa Benato, S. Berlendis, Eshwen Bhal, Freya Blekman, Christina Borovilou, Jamie Boyd, Benjamin P. Brau, Lene Bryngemark, Oliver Buchmueller, Malte Buschmann, William Buttinger, Mario Campanelli, Cari Cesarotti, Chunhui Chen, Hsin Chia Cheng, Sanha Cheong, Matthew Citron, Andrea Coccaro, V. Coco, Eric Conte, Félix Cormier, Louie D. Corpe, Nathaniel Craig, Yanou Cui, Elena Dall'Occo, C. Dallapiccola, M. R. Darwish, Alessandro Davoli, Annapaola De Cosa, Andrea De Simone, Luigi Delle Rose, Frank F. Deppisch, Biplab Dey, Miriam D. Diamond, Keith R. Dienes, Sven Dildick, Babette Döbrich, Marco Drewes, Melanie Eich, M. ElSawy, Alberto Escalante Del Valle, Gabriel Facini, Marco Farina, Jonathan L. Feng, Oliver Fischer, H. U. Flaecher, Patrick Foldenauer, Marat Freytsis, Benjamin Fuks, Iftah Galon, Yuri Gershtein, Stefano Giagu, Andrea Giammanco, Vladimir V. Gligorov, Tobias Golling, Sergio Grancagnolo, Giuliano Gustavino, Andrew Haas, Kristian Hahn, Jan Hajer, Ahmed Hammad, Lukas Heinrich, Jan Heisig, J. C. Helo, Gavin Hesketh, Christopher S. Hill, Martin Hirsch, M. Hohlmann, W. Hulsbergen, John Huth, Philip Ilten, Thomas Jacques, Bodhitha Jayatilaka, Geng Yuan Jeng, K. A. Johns, Toshiaki Kaji, Gregor Kasieczka, Yevgeny Kats, Malgorzata Kazana, Henning Keller, Maxim Yu Khlopov, Felix Kling, Ted R. Kolberg, Igor Kostiuk, Emma Sian Kuwertz, Audrey Kvam, Greg Landsberg, Gaia Lanfranchi, Iñaki Lara, Alexander Ledovskoy, Dylan Linthorne, Jia Liu, Iacopo Longarini, Steven Lowette, Henry Lubatti, Margaret Lutz, Jingyu Luo, Judita Mamuzi, Matthieu Marinangeli, Alberto Mariotti, Daniel Marlow, Matthew McCullough, Kevin McDermott, P. Mermod, David Milstead, Vasiliki A. Mitsou, Javier Montejo Berlingen, Filip Moortgat, Alessandro Morandini, Alice Polyxeni Morris, David Michael Morse, Stephen Mrenna, Benjamin Nachman, Miha Nemevsek, Fabrizio Nesti, Christian Ohm, Silvia Pascoli, Kevin Pedro, Cristián Peña, Karla Josefina Pena Rodriguez, Jónatan Piedra, James L. Pinfold, Antonio Policicchio, Goran Popara, Jessica Prisciandaro, Mason Proffitt, Giorgia Rauco, Federico Redi, Matthew Reece, Allison Reinsvold Hall, H. Rejeb Sfar, Sophie Renner, Amber Roepe, Manfredi Ronzani, Ennio Salvioni, Arka Santra, Ryu Sawada, Jakub Scholtz, Philip Schuster, Pedro Schwaller, Cristiano Sebastiani, Sezen Sekmen, Michele Selvaggi, Weinan Si, Livia Soffi, Daniel Stolarski, David Stuart, John Stupak, Kevin Sung, Wendy Taylor, Sebastian Templ, Brooks Thomas, Emma Torró-Pastor, Daniele Trocino, Sebastian Trojanowski, Marco Trovato, Yuhsin Tsai, C. G. Tully, Tamás Álmos Vámi, Juan Carlos Vasquez, Carlos Vázquez Sierra, K. Vellidis, Basile Vermassen, Martina Vit, Devin G.E. Walker, Xiao Ping Wang, Gordon Watts, Si Xie, Melissa Yexley, Charles Young, Jiang Hao Yu, Piotr Zalewski, Yongchao Zhang

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - Mar 11 2019

ASJC Scopus subject areas

  • General

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