Energetic long-lived particles in the CMS muon chambers

• DOI: 10.48550/arxiv.2304.06109
• Publication Date: 2023-09-29
• Authors: Mitridate, Andrea; Papucci, Michele; Wang, Christina W.; Peña, Cristián; Xie, Si
• Keywords: exceptional; CMS; shielding; background; muon: detector; FOS: Physical sciences; showers; ATLAS; interpretation of experiments: CMS; GeV; 530; interpretation of experiments: ATLAS; High Energy Physics - Experiment; High Energy Physics - Phenomenology; High Energy Physics - Experiment (hep-ex); High Energy Physics - Phenomenology (hep-ph); benchmark; iron; calorimeter; particle, long-lived; particle: long-lived; info:eu-repo/classification/ddc/530; muon, detector; numerical calculations

Physical review / D 108(5), 055040 (2023). doi:10.1103/PhysRevD.108.055040<br/>Published by American Physical Society, Ridge, NY<br/>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.<br/>