Probing squeezed bino-slepton spectra with the Large Hadron Collider Academic Article uri icon

abstract

  • © 2017 American Physical Society. We consider a minimal supersymmetric Standard Model scenario in which the only light superparticles are a binolike dark matter candidate and a nearly degenerate slepton. It is notoriously difficult to probe this scenario at the Large Hadron Collider (LHC), because the slepton pair-production process yields a final state with soft leptons and small missing transverse energy. We study this scenario in the region of parameter space where the mass difference between the lightest neutralino and the lightest slepton (Δm) is 60 GeV, focusing on the process in which an additional radiated jet provides a transverse boost to the slepton pair. We then utilize the angular separation of the leptons from each other and from the missing transverse energy, as well as the angular separation between the jet and the missing transverse energy, to distinguish signal from background events. We also use the reconstructed ditau mass, the cosθ12∗ variable, and for larger Δm, a lower bound on the lepton pT. These cuts can dramatically improve both signal sensitivity and the signal-to-background ratio, permitting discovery at the LHC with reasonable integrated luminosity over the interesting region of parameter space. Using our search strategy the LHC will be able to exclude mμ≈200 GeV for Δm60 GeV at 1.5-3σ with 1000 fb-1 of integrated luminosity. Although we focus on a particular model, the results generalize to a variety of scenarios in which the dark matter and a leptonic partner are nearly degenerate in mass, and especially to scenarios featuring a scalar mediator.

published proceedings

  • Physical Review D

altmetric score

  • 2

author list (cited authors)

  • Dutta, B., Fantahun, K., Fernando, A., Ghosh, T., Kumar, J., Sandick, P., Stengel, P., & Walker, J. W

citation count

  • 4

complete list of authors

  • Dutta, Bhaskar||Fantahun, Kebur||Fernando, Ashen||Ghosh, Tathagata||Kumar, Jason||Sandick, Pearl||Stengel, Patrick||Walker, Joel W

publication date

  • October 2017