Displaced Supersymmetry

作者：Graham Peter W^*; Kaplan David E; Rajendran Surjeet; Saraswat Prashant

来源：The Journal of High Energy Physics, 2012, 2012(7): 149.

DOI：10.1007/JHEP07(2012)149

• Supersymmetry Phenomenology

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 LHu, 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 similar to 1-10(3) mm, constraints on superpartner masses can be as low as similar to 450 GeV for squarks and similar to 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.

• 出版日期2012-7