Particle Seminar

Thursday, April 18, 2019

Speaker: Kevin Earl

Time: 2:30PM -- 3:30PM

Location: HP 4351

Title: Investigating baryonic R-parity violation at the LHC

Abstract:  The ATLAS and CMS collaborations have performed multiple searches for possible Minimal Supersymmetric Standard Model (MSSM) signatures. Many of these searches focus on R-parity conserving (RPC) models of supersymmetry and typically require large missing transverse momentum (MET). Alternatively, R-parity may be violated (RPV) and this removes MET but opens new signatures like multiple leptons or large numbers of jets. Multiple ATLAS and CMS searches have looked for these types of signatures too and have produced impressive bounds. In this talk, I will consider one of the last few unconstrained RPV signatures: electroweak production of neutralino and chargino pairs which decay promptly due to the RPV lambda'' UDD superpotential operator. The idea will be to consider the production of same sign tops and four jets. The same sign tops can lead to same sign leptons and by recasting a recent CMS search looking for same sign leptons and b-jets it will be shown that this parameter space is starting to be constrained. Additionally, the production of same sign tops has a few subtleties which will be discussed in detail. While not directly a concern for the RPVMSSM, these subtleties play an important role in R-symmetric models of supersymmetry where the R-symmetry is identified with baryon number.