CMS-PAS-EXO-24-020

CMS-PAS-EXO-24-020
Search for the pair production of long-lived supersymmetric partners of the tau lepton in proton-proton collisions at $ \sqrt{s}= $ 13 TeV
CMS Collaboration
2025-07-18

Abstract: Gauge-mediated supersymmetry breaking models provide a strong motivation to search for a supersymmetric partner of the tau lepton (stau) with a macroscopic lifetime. Long-lived stau decays produce tau leptons that are displaced from the primary proton-proton interaction vertex, leading to unconventional signatures in the detector. This study presents the first search for the direct production of long-lived staus decaying within the tracker volume in proton-proton collisions at $ \sqrt{s} = $ 13 TeV, performed with a dedicated graph network-based identification algorithm for displaced tau leptons. The data sample used, corresponding to an integrated luminosity of 138 fb$ ^{-1} $, was recorded with the CMS experiment at the CERN LHC between 2016 and 2018. This search excludes at 95% confidence level stau masses in the 90-290 (90-450) GeV range for $ c\tau_{0} = $ 50 mm in the maximally mixed (mass degenerate) scenario, while for $ m_{\tilde{\tau}} = $ 200 GeV, stau proper lifetimes are excluded in the range 15-130 (5-390) mm.
Links: CDS record (PDF) ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to JHEP. The superseded preliminary plots can be found here.

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