Searching for left sneutrino LSP at the LHC

PRADIPTA GHOSH, IÑAKI LARA, DANIEL E. LOPEZ -FOGLIANI, C. MUÑOZ, R. RUIZ DE AUSTRI

INTERNATIONAL JOURNAL OF MODERN PHYSICS A

WORLD SCIENTIFIC PUBL CO PTE LTD

Lugar: London, UK; Año: 2018

0217-751X

We analyze relevant signals expected at the LHC for a left sneutrino as thelightest supersymmetric particle (LSP). The discussion is carried out in the`μ from ν´ supersymmetric standard model (μνSSM), where thepresence of R-parity breaking couplings involving right-handed neutrinossolves the μ problem and reproduces neutrino data. The sneutrinos are pairproduced via a virtual W, Z or γ in the s channel. From the promptdecay of a pair of left sneutrinos LSPs of any family, a significant diphotonsignal plus missing transverse energy (MET) from neutrinos can be present inthe mass range 118-132 GeV, with 13 TeV center-of-mass energy and an integratedluminosity of 100 fb−1. In addition, in the case of a pair of tau leftsneutrinos LSPs, given the large value of the tau Yukawa coupling diphoton plusleptons and/or multileptons can appear. We find that the number of expectedevents for the multilepton signal, together with properly adopted searchstrategies, is sufficient to give a significant evidence for a sneutrino ofmass in the range 130-310 GeV, even with the integrated luminosity of 20fb−1. In the case of the signal producing diphoton plus leptons, anintegrated luminosity of 100 fb−1 is needed to give a significant evidencein the mass range 95-145 GeV. Finally, we discuss briefly the presence ofdisplaced vertices and the associated range of masses.