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

Abstract

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.

Authors:
 [1];  [2];  [1]
  1. Univ. of Chicago, Chicago, IL (United States)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Maryland, College Park, MD (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1457538
Report Number(s):
arXiv:1805.05957; FERMILAB-PUB-18-173-T; EFI-18-7
Journal ID: ISSN 0031-9007; PRLTAO; 1673386
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 122; Journal Issue: 13; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Liu, Jia, Liu, Zhen, and Wang, Lian -Tao. Enhancing Long-Lived Particles Searches at the LHC with Precision Timing Information. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.122.131801.
Liu, Jia, Liu, Zhen, & Wang, Lian -Tao. Enhancing Long-Lived Particles Searches at the LHC with Precision Timing Information. United States. doi:10.1103/PhysRevLett.122.131801.
Liu, Jia, Liu, Zhen, and Wang, Lian -Tao. Wed . "Enhancing Long-Lived Particles Searches at the LHC with Precision Timing Information". United States. doi:10.1103/PhysRevLett.122.131801. https://www.osti.gov/servlets/purl/1457538.
@article{osti_1457538,
title = {Enhancing Long-Lived Particles Searches at the LHC with Precision Timing Information},
author = {Liu, Jia and Liu, Zhen and Wang, Lian -Tao},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.122.131801},
journal = {Physical Review Letters},
number = 13,
volume = 122,
place = {United States},
year = {2019},
month = {4}
}

Journal Article:
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