Abstract
Supersymmetry searches at the LHC are both highly varied and highly constraining, but the vast majority are focused on cases where the final-stage visible decays are prompt. Scenarios featuring superparticles with detector-scale lifetimes have therefore remained a tantalizing possibility for sub-TeV SUSY, since explicit limits are relatively sparse. Nonetheless, the extremely low backgrounds of the few existing searches for collider-stable and displaced new particles facilitates recastings into powerful long-lived superparticle searches, even for models for which those searches are highly non-optimized. In this paper, we assess the status of such models in the context of baryonic R-parity violation, gauge mediation, and mini-split SUSY. We explore a number of common simplified spectra where hadronic decays can be important, employing recasts of LHC searches that utilize different detector systems and final-state objects. The LSP/NLSP possibilities considered here include generic colored superparticles such as the gluino and light-flavor squarks, as well as the lighter stop and the quasi-degenerate Higgsino multiplet motivated by naturalness. We find that complementary coverage over large swaths of mass and lifetime is achievable by superimposing limits, particularly from CMS's tracker-based displaced dijet search and heavy stable charged particle searches. Adding in prompt searches, we find many cases where a range of sparticle masses is now excluded from zero lifetime to infinite lifetime with no gaps. In other cases, the displaced searches furnish the only extant limits at any lifetime.
Highlights
Lengths spanning from sub-mm to tens of meters
We find that complementary coverage over large swaths of mass and lifetime is achievable by superimposing limits, from CMS’s tracker-based displaced dijet search and heavy stable charged particle searches
Such “displaced” particles can occur in models with R-parity violation (RPV) [3] or gauge mediated SUSY breaking (GMSB) [4], and in mini-split spectra where all squarks are at roughly the 1000 TeV scale [5, 6] and the gluino lifetime becomes extended
Summary
Displaced decay searches at the LHC are currently limited to a handful of specific new physics scenarios. Searches that target minimal SUSY include non-pointing photons in gauge mediation (assuming a mostly-bino LSP) [11, 12], the “disappearing track” signature. CMS has re-interpreted its stable charged particle searches for a large ensemble of pMSSM models with long but finite lifetimes [9], and we apply a similar strategy to our more focused set of models From this modest but growing list of analyses, we select seven that appear to be of greatest relevance for the SUSY models studied in section 3: the CMS heavy stable charged particle search [8], the CMS displaced dijets search [17], the CMS displaced dileptons search [18], the CMS displaced electron and muon search [15], the ATLAS muon chamber search [20], the ATLAS low-EM jet search [19], and the ATLAS displaced muon plus tracks search [14].
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