Electroweak superpartners scrutinized at the LHC in events with multi-leptons

• Autores: Lara, Iñaki; López-Fogliani, Daniel E.; Muñoz, Carlos
• Año de publicación: 2019
• Idioma: inglés
• Tipo de recurso: artículo
• Fuente: Physics Letters B. 2019, 790
• Materia: NEUTRINOS; LEPTONES; FISICA; PARTICULAS ELEMENTALES; SUPERSIMETRIA; FENOMENOLOGIA
• Institución: Pontificia Universidad Católica Argentina

Fil: Lara, Iñaki. Universidad Autónoma de Madrid. Departamento de Física Teórica. Instituto de Física Teórica; España
Fil: Lara, Iñaki. Consejo Superior de Investigaciones Científicas; España
Fil: López-Fogliani, Daniel E. Universidad de Buenos Aires. Facultad de Ciencia Exactas y Naturales. Departamento de Física. Instituto de Física de Buenos Aires; Argentina
Fil: López-Fogliani, Daniel E. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: López-Fogliani, Daniel E. Pontificia Universidad Católica Argentina. Facultad de Ingeniería y Ciencias Agrarias; Argentina
Fil: Muñoz, Carlos. Universidad Autónoma de Madrid. Departamento de Física Teórica. Instituto de Física Teórica; España
Fil: Muñoz, Carlos. Pontificia Universidad Católica Argentina. Facultad de Ingeniería y Ciencias Agrarias; Argentina
Abstract: We analyze a multi-lepton signal plus missing transverse energy from neutrinos expected at the LHC for a bino-like neutralino as the lightest supersymmetric particle (LSP), when the left sneutrino is the next-to-LSP and hence a suitable source of binos. The discussion is carried out in the framework of the μνSSM, where the presence of R-parity violating (RPV) couplings involving right-handed neutrinos solves the μ problem and can reproduce simultaneously the neutrino data. Left sneutrinos/sleptons are pair-produced at pp collisions decaying to binos, with the latter decaying via RPV to Wℓ or Zν. This signal can be compared with LHC searches for electroweak superpartners through chargino–neutralino production. The reduced cross section of the sneutrino/slepton production in comparison with the one of the latter process, limits the sensitivity of the searches to small sneutrino/slepton masses. Although the resulting compressed spectrum typically evades the aforementioned searches, we show that analyses using recursive jigsaw reconstruction are sensitive to these scenarios. As a by-product, we find that the region of bino masses 110–120 GeV and sneutrino masses 120–140 GeV can give rise to a tri-lepton signal compatible with the local excess recently reported by ATLAS.