Slepton discovery in electroweak cascade decay

Jonathan Eckel, William Shepherd, Shufang Su

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The LHC studies on the MSSM slepton sector have mostly been focused on direct slepton Drell-Yan pair production. In this paper, we analyze the case when the sleptons are lighter than heavy neutralinos and can appear in the on-shell decay of neutralino states. In particular, we have studied the χ1±χ20 associated production, with the consequent decays of χ1± → νℓχ10 and χ02 → ℓℓ01 via on-shell sleptons. The invariant mass of the lepton pairs, mℓ , from the neutralino decay has a distinctive triangle shape with a sharp kinematic cutoff. We discuss the utilization of this triangle shape in m distribution to identify the slepton signal. We studied the trilepton plus missing ET signal and obtained the effective cross section, σ × BR × acceptance, that is needed for a 5σ discovery as a function of the cutoff mass for the LHC with center of mass energy 14TeV and 100 fb-1 integrated luminosity. Our results are model independent such that they could be applied to other models with similar decay topology. When applied to the MSSM under simple assumptions, it is found that with 100 fb-1 integrated luminosity, a discovery reach in the left-handed slepton mass of about 600 GeV could be reached, which extends far beyond the slepton mass reach in the usual Drell-Yan studies.

Original languageEnglish (US)
Article number81
JournalJournal of High Energy Physics
Issue number5
StatePublished - 2012


  • Supersymmetry phenomenology

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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