Journal Article

Displaced Supersymmetry

Graham, Peter W., Saraswat, Prashant, Kaplan, David E., Rajendran, Surjeet

2012

Overview

A bstract The apparent absence of light superpartners at the LHC strongly constrains the viability of the MSSM as a solution to the hierarchy problem. These constraints can be significantly alleviated by R -parity violation (RPV). Bilinear R -parity violation, with the single operator LH u , does not require any special flavor structure and can be naturally embedded in a GUT while avoiding constraints from proton decay (unlike baryon-number-violating RPV). The LSP in this scenario can be naturally long-lived, giving rise to displaced vertices. Many collider searches, particularly those selecting b -jets or leptons, are insensitive to events with such detector-scale displaced decays owing to cuts on track quality and impact parameter. We demonstrate that for decay lengths in the window ∼1–10 3  mm, constraints on superpartner masses can be as low as ∼450 GeV for squarks and ∼40 GeV for LSPs. In some parts of parameter space light LSPs can dominate the Higgs decay width, hiding the Higgs from existing searches. This framework motivates collider searches for detector-scale displaced vertices. LHCb may be ideally suited to trigger on such events, while ATLAS and CMS may need to trigger on missing energy or multijet signatures.

• Publisher: Springer-Verlag,Springer Nature B.V
• Subject: Apexes / Classical and Quantum Gravitation / Decay / Displacement / Elementary Particles / High energy physics / Large Hadron Collider / Leptons / Parameters / Parity / Physics / Physics and Astronomy / Quantum Field Theories / Quantum Field Theory / Quantum Physics / Relativity Theory / Searching / String Theory / Supersymmetry