Searching for left sneutrino LSP at the LHC

Jul 8, 2017
62 pages
Published in:
  • Int.J.Mod.Phys.A 33 (2018) 18n19, 1850110
  • Published: Jul 4, 2018
e-Print:

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Abstract: (WSP)
We analyze relevant signals expected at the LHC for a left sneutrino as the lightest supersymmetric particle (LSP). The discussion is carried out in the “μ from ν” supersymmetric standard model (μνSSM), where the presence of R-parity breaking couplings involving right-handed neutrinos solves the μ problem and reproduces neutrino data. The sneutrinos are pair produced via a virtual W, Z or γ in the s channel. From the prompt decay of a pair of left sneutrinos LSPs of any family, a significant diphoton signal plus missing transverse energy (MET) from neutrinos can be present in the mass range 118–132 GeV, with 13 TeV center-of-mass energy and an integrated luminosity of 100 fb−1. In addition, in the case of a pair of tau left sneutrinos LSPs, given the large value of the tau Yukawa coupling diphoton plus leptons and/or multileptons can appear. We find that the number of expected events for the multilepton signal, together with properly adopted search strategies, is sufficient to give a significant evidence for a sneutrino of mass in the range 130–310 GeV, even with the integrated luminosity of 20 fb−1. In the case of the signal producing diphoton plus leptons, an integrated luminosity of 100 fb−1 is needed to give a significant evidence in the mass range 95–145 GeV. Finally, we discuss briefly the presence of displaced vertices and the associated range of masses.
Note:
  • Version published in IJMPA. 54 pages, 8 figures, 14 tables
  • 12.60.Jv
  • 14.80.Ly
  • Supersymmetry phenomenology
  • supersymmetric Standard Model
  • sneutrino: mass
  • sneutrino: LSP
  • neutrino: right-handed
  • standard model: supersymmetry
  • coupling: Yukawa
  • transverse energy: missing-energy