Stop and Sbottom LSP with R-parity Violation

TL;DR

This paper explores collider signatures of third-generation squark LSPs with R-parity violation, reinterprets LHC data to set mass limits, and suggests that sbottom decays could explain CMS leptoquark excesses.

Contribution

It provides new constraints on third-generation squark LSPs with R-parity violation and links sbottom decays to observed collider anomalies.

Findings

Sbottom LSPs decaying to top quarks and leptons weaken collider constraints.

Third-generation squark LSPs are excluded up to about 660 GeV.

Sbottom decays can potentially explain CMS leptoquark excesses.

Abstract

Considering a third-generation squark as the lightest supersymmetric particle (LSP), we investigate R-parity violating collider signatures with bilinear LH or trilinear LQD operators that may contribute to observed neutrino masses and mixings. Reinterpreting the LHC 7+8 TeV results of SUSY and leptoquark searches, we find that third-generation squark LSPs decaying to first- or second-generation leptons are generally excluded up to at least about 660 GeV at 95%C.L.. One notable feature of many models is that sbottoms can decay to top quarks and charged leptons that lead to a broader invariant mass spectrum and weaker collider constraints. More dedicated searches with $b$-taggings or top reconstructions are thus encouraged. Finally, we discuss that the recently observed excesses in the CMS leptoquark search can be accommodated by the decay of sbottom LSPs in the LQD$_{113+131}$ model.