Looking for the left sneutrino LSP with displaced-vertex searches

Iñaki Lara, Daniel E. López-Fogliani, Carlos Muñoz, Natsumi Nagata, Hidetoshi Otono, Roberto Ruiz De Austri

Research output: Contribution to journalArticle

4 Citations (Scopus)

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 γ 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 framework of the μνSSM, where the presence of R-parity violating couplings involving right-handed neutrinos solves the μ problem and can reproduce the neutrino data. To probe the tau left sneutrinos we compare the predictions of this scenario with the ATLAS search for long-lived particles using displaced lepton pairs in pp collisions at 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.

Original languageEnglish
Article number075004
JournalPhysical Review D
Volume98
Issue number7
DOIs
Publication statusPublished - Oct 1 2018

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apexes
neutrinos
optimization
leptons
actuators
parity
requirements
collisions
probes
decay
predictions
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

Lara, I., López-Fogliani, D. E., Muñoz, C., Nagata, N., Otono, H., & Ruiz De Austri, R. (2018). Looking for the left sneutrino LSP with displaced-vertex searches. Physical Review D, 98(7), [075004]. https://doi.org/10.1103/PhysRevD.98.075004

Looking for the left sneutrino LSP with displaced-vertex searches. / Lara, Iñaki; López-Fogliani, Daniel E.; Muñoz, Carlos; Nagata, Natsumi; Otono, Hidetoshi; Ruiz De Austri, Roberto.

In: Physical Review D, Vol. 98, No. 7, 075004, 01.10.2018.

Research output: Contribution to journalArticle

Lara, I, López-Fogliani, DE, Muñoz, C, Nagata, N, Otono, H & Ruiz De Austri, R 2018, 'Looking for the left sneutrino LSP with displaced-vertex searches', Physical Review D, vol. 98, no. 7, 075004. https://doi.org/10.1103/PhysRevD.98.075004
Lara I, López-Fogliani DE, Muñoz C, Nagata N, Otono H, Ruiz De Austri R. Looking for the left sneutrino LSP with displaced-vertex searches. Physical Review D. 2018 Oct 1;98(7). 075004. https://doi.org/10.1103/PhysRevD.98.075004
Lara, Iñaki ; López-Fogliani, Daniel E. ; Muñoz, Carlos ; Nagata, Natsumi ; Otono, Hidetoshi ; Ruiz De Austri, Roberto. / Looking for the left sneutrino LSP with displaced-vertex searches. In: Physical Review D. 2018 ; Vol. 98, No. 7.
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