Impact of LSP character on Slepton reach at the LHC

Abstract

Searches for supersymmetry at the Large Hadron Collider (LHC) have significantly 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 lightest supersymmetric particle (LSP). In particular, in the Higgsino-like LSP scenarios, both decay branching fractions of˜ L andν depend strongly on the sign and value of M 1 /M 2 , which has strong implications for the reach of dilepton plus / E T searches for slepton pair production. We extend the experimental results for same flavor, opposite sign dilepton plus / E T searches at the 8 TeV LHC to various LSP scenarios. We find 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 M 1 /M 2 ∼ − tan 2 θ W and is the weakest (∼ 220 GeV) for M 1 /M 2 ∼ tan 2 θ 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 (Winolike) 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 5σ discovery sensitivity is about 100 GeV smaller. For 300 fb −1 integrated luminosity, the reach is about 50 − 100 GeV higher.

Dark matter relic from muon anomalies

“…Since dedicated DM searches through direct detection are not sensitive to our scenario, the 14 TeV LHC will be the most important experiment to probe it. We expect that the reach for dark muons should be improved by close to a factor of two during run II, similarly to what was found for smuons [60,61]. Thus, the parameter space of the heavy lepton scenario will be fully covered, since the g µ − 2 anomaly sets an upper bound m L 800 GeV for couplings y < 4π.…”

Neutralinos and sleptons at the LHC in light of muon(g−2)μ

“…[26] has established a 95% CL exclusion limit of 550 GeV with Mχ0 To be consistent with the rest of the paper we have extracted the background yield of Ref. [26] and extrapolated the 95% CL exclusion limit for sleptons at 3000 fb −1 , with our definition of statistical significance. We found the corresponding limits to be ∼ 775 GeV forl L and ∼ 670 GeV forl R with Mχ0 1 = 100 GeV.…”

“…Although we did not carry out any exclusive search for smuons, whenever necessary we have extrapolated the results from Ref. [26], where the authors have explored the prospect of finding sleptons at the LHC for different compositions of the LSP.…”

“…[26] has recently investigated the slepton mass reach for varying nature of the LSP. In contrast we have restricted ourselves to only bino-type LSP in this paper, as argued earlier.…”

Antisplit Supersymmetry

“…Slepton decays would follow a similar trajectory. In fact this scenario was studied in reference [33] and found that unless the spectrum was quite compressed, left handed slepton mass bounds might be set as high as 490 GeV. This is because over much of parameter space charged sleptons prefer to decay to a lepton and lightest neutralino, rather than a neutrino and chargino.…”