Impact of LSP character on Slepton reach at the LHC

Searches for supersymmetry at the Large Hadron Collider (LHC) have signi�- cantly constrained the parameter space associated with colored superpartners, whereas the constraints on color-singlet superpartners are considerably less severe. In this study, we investigate the dependence of slepton decay branching fractions on the nature of the light- est supersymmetric particle (LSP). In particular, in the Higgsino-like LSP scenarios, both decay branching fractions of ~L and ~ �` depend strongly on the sign and value of M1=M2, which has strong implications for the reach of dilepton plus = E T searches for slepton pair production. We extend the experimental results for same avor, opposite sign dilepton plus = ET searches at the 8 TeV LHC to various LSP scenarios. Wend that the LHC bounds on sleptons are strongly enhanced for a non-Bino-like LSP: the 95% C.L. limit for m~ `L extends from 300 GeV for a Bino-like LSP to about 370 GeV for a Wino-like LSP. The bound for ~ `L with a Higgsino-like LSP is the strongest (� 490 GeV) for M1=M2� tan 2 �W and is the weakest (� 220 GeV) for M1=M2� tan 2 �W. We also calculate prospective slepton search reaches at the 14 TeV LHC. With 100 fb 1 integrated luminosity, the projected 95% C.L. mass reach for the left-handed slepton varies from 550 (670) GeV for a Bino-like (Wino- like) LSP to 900 (390) GeV for a Higgsino-like LSP under the most optimistic (pessimistic) scenario. The reach for the right-handed slepton is about 440 GeV. The corresponding 5� discovery sensitivity is about 100 GeV smaller. For 300 fb 1 integrated luminosity, the