Confronting the R-parity-violating MSSM with Flavor Observables and Displaced Vertices

Abstract

Supersymmetry (SUSY) was proposed as one of the solutions to the hierarchy problem. In addition, R-parity (R_p) is often imposed in such models in order to <em>e.g.</em> avoid proton decay. These R_p -conserving models also predict a stable candidate for cold dark matter. However, R_p -violating (RpV) SUSY models lead to a rich and distinctive phenomenology that should not be ignored.<br /> While at the Large Hadron Collider (LHC), none of the new fundamental particles predicted by New-Physics (NP) theories have been discovered yet, both low-energy observables and direct-production searches at colliders can be exploited in order to constrain further NP theories. Among others, flavor observables that are already well explained by Standard-Model predictions could receive<br /> contributions from beyond-the-Standard-Model (BSM) physics. The experimental measurements therefore place limits on these contributions and through them on the NP parameters. In this thesis, we study the particular case of neutral meson oscillation phenomena, and present updated bounds on RpV couplings. At the LHC, small RpV couplings could produce displaced vertex signatures. Several new detectors such as MATHUSLA, CODEX-b, FASER and AL3X have been proposed for long-lived particle searches. We estimate sensitivity reach of these new components in the parameter space of several BSM frameworks including RpV-SUSY and heavy neutral leptons.