Enhancing Long-Lived Particles Searches at the LHC with Precision Timing Information

Liu, Jia; Liu, Zhen; Wang, Lian -Tao

doi:10.1103/PhysRevLett.122.131801

Title: Enhancing Long-Lived Particles Searches at the LHC with Precision Timing Information

Journal Article · 03 April 2019 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.122.131801 · OSTI ID:1457538

Liu, Jia ^[1]; Liu, Zhen ^[2]; Wang, Lian -Tao ^[1]

Univ. of Chicago, Chicago, IL (United States)
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Maryland, College Park, MD (United States)

We explore the physics potential of using precision timing information at the LHC in searches for long-lived particles (LLPs). In comparison with the light standard model particles, the decay products of massive LLPs arrive at detectors with time delays around the nanosecond scale. We propose new strategies to take advantage of this time delay feature by using initial state radiation to time stamp the collision event and require at least one LLP to decay within the detector. This search strategy is effective for a broad range of models. In addition to outlining this general approach, we demonstrate its effectiveness with the projected reach for two benchmark scenarios: a Higgs boson decaying into a pair of LLPs, and pair production of long-lived neutralinos in the gauge mediated supersymmetry breaking models. Our strategy increases the sensitivity to the lifetime of the LLP by two orders of magnitude or more and particularly exhibits a better behavior with a linear dependence on the lifetime in the large lifetime region compared to traditional LLP searches. Furthermore the timing information significantly reduces the standard model background and provides a powerful new dimension for LLP searches.

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

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

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1457538

Report Number(s):: arXiv:1805.05957; FERMILAB-PUB-18-173-T; EFI-18-7; PRLTAO; 1673386

Journal Information:: Physical Review Letters, Vol. 122, Issue 13; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 55 works

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