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Título : Looking for the left sneutrino LSP with displaced-vertex searches
Autor : Lara, Iñaki 
López-Fogliani, Daniel E. 
Muñoz, Carlos 
Nagata, Natsumi 
Otono, Hidetoshi 
Ruiz de Austri, Roberto 
Fecha de publicación : 2018
Editorial : American Physical Society
Cita : Lara, I. Looking for the left sneutrino LSP with displaced-vertex searches [en línea]. Physical Review D. 2018, 98. doi:10.1103/PhysRevD.98.075004 Disponible en:
Resumen : Abstract: We analyze a displaced dilepton signal expected at the LHC for a tau left sneutrino as the lightest supersymmetric particle with a mass in the range $45$-$100$ GeV. The sneutrinos are pair produced via a virtual $W$, $Z$ or $\gamma$ in the $s$ channel and, given the large value of the tau Yukawa coupling, their decays into two dileptons or a dilepton plus missing transverse energy from neutrinos can be significant. The discussion is carried out in the $\mu \nu$SSM, where the presence of $R$-parity violating couplings involving right-handed neutrinos solves the $\mu$ problem and can reproduce the neutrino data. To probe the tau left sneutrinos we compare the predictions of the $\mu \nu$SSM with the ATLAS search for long-lived particles using displaced lepton pairs in $pp$ collisions at $\sqrt s= 8$ TeV, allowing us to constrain the parameter space of the model. We also consider an optimization of the trigger requirements used in existing displaced-vertex searches by means of a High Level Trigger that exploits tracker information. This optimization is generically useful for a light metastable particle decaying into soft charged leptons. The constraints on the sneutrino turn out to be more stringent. We finally discuss the prospects for the $13$ TeV LHC searches as well as further potential optimizations.
ISSN : 2470-0010 (impreso)
2470-0029 (online)
Disciplina: INGENIERIA
DOI: 10.1103/PhysRevD.98.075004
Derechos: Acceso abierto
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