Search for bottom squarks in the baryon-number violating MSSM

Abstract

We consider a scenario of Minimal Supersymmetric Standard Model (MSSM) with $R$-parity violation, where the lightest supersymmetric particle (LSP) is the lighter sbottom $({\tilde{b}}_1)$. We study the production of a sbottom pair at the LHC and their subsequent decays through the baryon number violating $(UDD)$ operators leading to a top pair with two light quarks. Looking for both semi-leptonic and fully hadronic (no leptons) final states, we perform cut-based as well as multivariate analyses (MVA) to estimate the signal significance at the 13 TeV run of the LHC. We find that a cut-based analysis can probe sbottom mass upto $\sim 650$ GeV which may be extended upto $\sim 750$ GeV using MVA with $300{\mathrm{fb}}^{-1}$ integrated luminosity. The fully hadronic final state, however, is not as promising.

Comments: 19 pages, 9 figures, 8 tables, revised leptonic analysis, new figures added, notable improvement in LHC sensitivity