Long-lived stops in MSSM scenarios with a neutralino LSP

Abstract

This work investigates the possibility of a long-lived stop squark in supersymmetric models with the neutralino as the lightest supersymmetric particle (LSP). We study the implications of meta-stable stops on the sparticle mass spectra and the dark matter density. We find that in order to obtain a sufficiently long stop lifetime so as to be observable as a stable R-hadron at an LHC experiment, we need to fine tune the mass degeneracy between the stop and the LSP considerably. This increases the stop-neutralino coanihilation cross section, leaving the neutralino relic density lower than what is expected from the WMAP results for stop masses ~1.5 TeV/c^2. However, if such scenarios are realised in nature we demonstrate that the long-lived stops will be produced at the LHC and that stop-based R-hadrons with masses up to 1 TeV/c^2 can be detected after one year of running at design luminosity.

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Cited by in corpus (8)

• Search for pair-produced third-generation squarks decaying via charm quarks or in compressed supersymmetric scenarios in $pp$ collisions at $\sqrt{s}=8$TeV with the ATLAS detector
• The Physics Programme Of The MoEDAL Experiment At The LHC
• Search for long-lived stopped R-hadrons decaying out-of-time with pp collisions using the ATLAS detector
• Probing Light Stop Pairs at the LHC
• Stop as a next-to-lightest supersymmetric particle in constrained MSSM
• A long-lived stop with freeze-in and freeze-out dark matter in the hidden sector
• Long-Lived BLSSM Particles at the LHC
• Constraining electroweak and strongly charged long-lived particles with CheckMATE