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We analyze a multi-lepton signal plus missing transverse energy fromneutrinos expected at the LHC for a Bino-like neutralino as the lightestsupersymmetric particle (LSP), when the left sneutrino is the next-to-LSP andhence a suitable source of Binos. The discussion is carried out in theframework of the $\mu \nu$SSM, where the presence of $R$-parity violating (RPV)couplings involving right-handed neutrinos solves the $\mu$ problem and canreproduce simultaneously the neutrino data. Left sneutrinos/sleptons are pairproduced at $pp$ collisions decaying to Binos, with the latter decaying via RPVto $W\ell$ or $Z\nu$. This signal can be compared with LHC searches forelectroweak superpartners through chargino-neutralino production. The reducedcross section of the sneutrino/slepton production in comparison with the one ofthe latter process, limits the sensitivity of the searches to smallsneutrino/slepton masses. Although the resulting compressed spectrum typicallyevades the aforementioned searches, we show that analyses using recursivejigsaw reconstruction are sensitive to these scenarios. As a by-product, wefind 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 localexcess recently reported by ATLAS.

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