Closing in on the Tip of the CMSSM Stau Coannihilation Strip

Abstract

Near the tip of the stau coannihilation strip in the CMSSM with a neutralino LSP, the astrophysical cold dark matter density constraint forces the stau-neutralino mass difference to be small. If this mass difference is smaller than the tau mass, the stau may decay either in the outer part of an LHC detector - the `disappearing track' signature - or be sufficiently long-lived to leave the detector before decaying - the long-lived massive charged-particle signature. We combine searches for these signatures with conventional missing transverse energy searches during LHC Run 1, identifying the small remaining parts of the CMSSM stau coannihilation strip region that have not yet been excluded, and discussing how they may be explored during Run 2 of the LHC.

19 pages, 6 figures. Fig. 1 and the corresponding text are changed due to the updated ATLAS result (ref.[16]). More details of our simulation are provided in Section 3.1. The caption of Fig. 6 and the corresponding text are changed. Matches the published version

References in corpus (6)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Performance of CMS muon reconstruction in pp collision events at sqrt(s) = 7 TeV
• Search for squarks and gluinos with the ATLAS detector in final states with jets and missing transverse momentum using $\sqrt{s}=8$ TeV proton--proton collision data
• The Extent of the Stop Coannihilation Strip
• The End of the CMSSM Coannihilation Strip is Nigh

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