Published September 1, 2023 | Version Published
Journal Article Open

Energetic long-lived particles in the CMS muon chambers

Abstract

We present a recast in different benchmark models of the recent CMS search that uses the end cap muon detector system to identify displaced showers produced by decays of long-lived particles (LLPs). The exceptional shielding provided by the steel between the stations of the muon system drastically reduces the Standard Model background that limits other existing ATLAS and CMS searches. At the same time, by using the muon system as a sampling calorimeter, the search is sensitive to LLPs energies rather than masses. We show that, thanks to these characteristics, this new search approach is sensitive to LLPs masses even lighter than a GeV, and can be complementary to proposed and existing dedicated LLP experiments.

Copyright and License

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. 

Funded by SCOAP3.

Acknowledgement

We would like to thank the CMS Collaboration and especially the CMS Exotica group, where part of this work was presented in 2021, for their positive feedback. C. W. and S. X. are partially supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics, under Award No. DE-SC0011925. This work has been discussed in the relevant Snowmass community study subgroups in 2022 and is part of C. W.'s PhD thesis along with additional reinterpretation studies based solely on CMS published results and Delphes public codes [34,52,59]. C. W., C. P., and S. X. are grateful to the organizers and participants of the "New ideas in detecting long-lived particles at the LHC" workshop at LBNL in the Summer of 2018 where experimentalists and theorists gathered to generate new ideas on triggers and analysis strategies for long-lived particles searches at the LHC [127] as well as the Fermilab LPC LLP group. A. M. was supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics, under Award No. DE-SC0021431, the Quantum Information Science Enabled Discovery (QuantISED) for High Energy Physics (KA2401032), and the Deutsche Forschungsgemeinschaft under Germany's Excellence Strategy—EXC 2121 Quantum Universe—390833306. M. P. was supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics, under Award No. DE-SC0011632 and by the Walter Burke Institute for Theoretical Physics. M. P. would like to thank the Aspen Center for Physics where part of this work was performed.

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Additional details

Identifiers

ISSN
2470-0029

Funding

United States Department of Energy
DE-SC0011925
United States Department of Energy
DE-SC0021431
United States Department of Energy
KA2401032
Deutsche Forschungsgemeinschaft
390833306
United States Department of Energy
DE-SC0011632
Walter Burke Institute for Theoretical Physics

Caltech Custom Metadata

Caltech groups
Walter Burke Institute for Theoretical Physics, CMS@Caltech