A Collective Breaking of R-Parity

TL;DR

This paper explores a novel R-parity breaking mechanism in supersymmetry where R-parity is broken collectively by multiple couplings, leading to unique collider signatures like many-object resonances, challenging traditional search methods.

Contribution

It introduces a model of collective R-parity violation that suppresses B and L violation signals, enabling new collider signatures with many objects, and discusses its potential detectability at the LHC.

Findings

Collective RPV suppresses B and L violation signals.

Models produce many-object resonance signatures.

Potential for large scalar production cross-sections.

Abstract

Supersymmetric theories with an R-parity generally yield a striking missing energy signature, with cascade decays concluding in a neutralino that escapes the detector. In theories where R-parity is broken the missing energy is replaced with additional jets or leptons, often making traditional search strategies ineffective. Such R-parity violation is very constrained, however, by resulting B and L violating signals, requiring couplings so small that LSPs will decay outside the detector in all but a few scenarios. In theories with additional matter fields, R-parity can be broken collectively, such that R-parity is not broken by any single coupling, but only by an ensemble of couplings. Cascade decays can proceed normally, with each step only sensitive to one or two couplings at a time, but B and L violation requires the full set, yielding a highly suppressed constraint. s-channel production of new scalar states, typically small for standard RPV, can be large when RPV is broken collectively. While missing energy is absent, making these models difficult to discover by traditional SUSY searches, they produce complicated many object resonances (MORes), with many different possible numbers of jets and leptons. We outline a simple model and discuss its discoverability at the LHC.