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We present a recast in different benchmark models of the recent CMS searchthat uses the endcap muon detector system to identify displaced showersproduced by decays of long-lived particles (LLPs). The exceptional shieldingprovided by the steel between the stations of the muon system drasticallyreduces the Standard Model background that limits other existing ATLAS and CMSsearches. 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 LLPsmasses even lighter than a GeV, and can be complementary to proposed andexisting dedicated LLP experiments.

Energetic long-lived particles in the CMS muon chambers