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Displaced Supersymmetry

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Abstract

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 ∼1–103 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.

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Authors and Affiliations

  1. Stanford Institute for Theoretical Physics, Department of Physics, Stanford University, Stanford, CA, 94305, U.S.A.

    Peter W. Graham, Surjeet Rajendran & Prashant Saraswat

  2. Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD, 21218, U.S.A.

    David E. Kaplan & Surjeet Rajendran

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  1. Peter W. Graham
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  2. David E. Kaplan
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  3. Surjeet Rajendran
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Correspondence to Prashant Saraswat.

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Graham, P.W., Kaplan, D.E., Rajendran, S. et al. Displaced Supersymmetry. J. High Energ. Phys. 2012, 149 (2012). https://doi.org/10.1007/JHEP07(2012)149

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