Abstract

The results from Run 1 of the LHC significantly ruled out the parameter of the constrained Minimal Supersymmetric Standard Model (CMSSM) — both directly through searches for superpartners and indirectly via the measurement of the Higgs mass. One of the viable regions in the CMSSM parameter space is the “stau co-annihilation strip”. The constraints from Run 1 already rule out a large portion of this strip, leaving a narrow tip that has not been explored in the conventional SUSY searches. Near the tip of the coannihilation strip, the astrophysical cold dark matter density constraint forces the stau-neutralino mass difference to be small resulting in long-lived staus which may result in more exotic signatures. We combine limits from searches for these signatures with those from conventional missing ET searches during LHC Run 1, identifying the small remaining parts of the CMSSM stau-coannihilation region that have not yet been excluded, and discussing how they may be explored during Run 2 of the LHC .