Long-lived heavy neutral leptons with a displaced shower signature at CMS

Creators: Cottin, Giovanna; Helo, Juan Carlos; Hirsch, Martin; Peña, Cristián; Wang, Christina; Xie, Si

Abstract

We study the LHC discovery potential in the search for heavy neutral leptons (HNL) with a new signature: a displaced shower in the CMS muon detector, giving rise to a large cluster of hits forming a displaced shower. A new Delphes module is used to model the CMS detector response for such displaced decays. We reinterpret a dedicated CMS search for neutral long-lived particles decaying in the CMS muon endcap detectors for the minimal HNL scenario. We demonstrate that this new strategy is particularly sensitive to active-sterile mixings with τ leptons, due to hadronic τ decays. HNL masses between ~ 1–6 GeV can be accessed for mixings as low as |V_(τN)|^(2) ~10^(−7), probing unique regions of parameter space in the τ sector.

Additional Information

© 2023 The Authors. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. Article funded by SCOAP3. We thank the Snowmass 2021 initiative for motivating this work. G.C. acknowledges support from ANID FONDECYT grant No. 11220237. G.C. and J.C.H. also acknowledge support from grant ANID FONDECYT grant No. 1201673 and ANID — Millennium Science Initiative Program ICN2019_044. This work is supported by the Spanish grants PID2020-113775GB-I00 (AEI/10.13039/ 501100011033) and CIPROM/2021/054 (Generalitat Valenciana). We would like to thank the CMS Collaboration. CW and SX are partially supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics, under Award Number DE-SC0011925. This work is part of CW's Ph.D. Thesis along with additional reinterpretation studies based solely on CMS published results and Delphes public codes [21, 39, 44]. CW, CP, and SX 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 [52] as well as the Fermilab LPC LLP group.

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Published - JHEP02_2023_011.pdf

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