The fate of long-lived superparticles with hadronic decays after LHC Run 1

Liu, Zhen; Tweedie, Brock

doi:10.1007/JHEP06(2015)042

Title: The fate of long-lived superparticles with hadronic decays after LHC Run 1

Journal Article · Mon Jun 08 00:00:00 EDT 2015 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP06(2015)042· OSTI ID:1221282

Liu, Zhen ^[1]; Tweedie, Brock ^[2]

Univ. of Pittsburgh, Pittsburgh, PA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Univ. of Pittsburgh, Pittsburgh, PA (United States)

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 then 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. By 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.

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Research Organization:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1221282

Report Number(s):: FERMILAB-PUB-15-087-T; PITT-PACC-1503; arXiv eprint number arXiv:1503.05923; TRN: US1500564

Journal Information:: Journal of High Energy Physics (Online), Vol. 2015, Issue 6; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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