Impact of LSP character on Slepton reach at the LHC

Article, Preprint English OPEN
Eckel, JonathanDepartment of Physics, University of Arizona, Tucson, AZ, 85721, U.S.A. ; Ramsey-Musolf, Michael(Amherst Center for Fundamental Interactions, Department of Physics University of Massachusetts-Amherst, Amherst, MA, 01003, U.S.A.) ; Shepherd, William(Department of Physics, University of California - Santa Cruz, Santa Cruz, CA, 95064, U.S.A.) ; Su, Shufang(Department of Physics, University of Arizona, Tucson, AZ, 85721, U.S.A.) (2014)
  • Publisher: Springer
  • Journal: (issn: 1029-8479)
  • Related identifiers: doi: 10.1007/JHEP11(2014)117
  • Subject: High Energy Physics - Phenomenology | High Energy Physics - Experiment | Supersymmetry Phenomenology | Nuclear and High Energy Physics
    arxiv: High Energy Physics::Phenomenology | High Energy Physics::Experiment

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 ˜ L $$ {\tilde{\ell}}_L $$ and ν ˜ ℓ $$ {\tilde{\nu}}_{\ell } $$ depend strongly on the sign and value of M 1 /M 2 , which has strong implications for the reach of dilepton plus searches for slepton pair production. We extend the experimental results for same flavor, opposite sign dilepton plus searches at the 8TeV 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 ˜ L $$ {m_{\tilde{\ell}}}_{{}_L} $$ extends from 300 GeV for a Bino-like LSP to about 370 GeV for a Wino-like LSP. The bound for ℓ ˜ L $$ {\tilde{\ell}}_L $$ 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 5 σ discovery sensitivity is about 100 GeV smaller. For 300 fb −1 integrated luminosity, the reach is about 50 − 100 GeV higher.
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