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Title: Enhancing sensitivities to long-lived particles with high granularity calorimeters at the LHC

Abstract

The search for long-lived particles (LLP) is an exciting physics opportunity in the upcoming runs of the Large Hadron Collider. In this paper, we focus on a new search strategy of using the High Granularity Calorimeter (HGCAL), part of the upgrade of the CMS detector, in such searches. In particular, we demonstrate that the high granularity of the calorimeter allows us to see “shower tracks” in the calorimeter, and can play a crucial role in identifying the signal and suppressing the background. We study the potential reach of the HGCAL using a signal model in which the Standard Model Higgs boson decays into a pair of LLPs, h → XX. After carefully estimating the Standard Model QCD and the misreconstructed fake-track backgrounds, we give the projected reach for both an existing vector boson fusion trigger and a novel displaced-track-based trigger. Our results show that the best reach for the Higgs decay branching ratio, BR(h → XX), in the vector boson fusion channel is about O(10–4) with lifetime cτX ~ 0.1–1 meters, while for the gluon gluon fusion channel it is about O(10–5 – 10–6) for similar lifetimes. For longer lifetime cτX ~ 103 meters, our search could probe BR(h →more » XX) down to a few ×10–4(10–2) in the gluon gluon fusion (vector boson fusion) channels, respectively. In comparison with these previous searches, our new search shows enhanced sensitivity in complementary regions of the LLP parameter space. We also comment on many improvements can be implemented to further improve our proposed search.« less

Authors:
 [1];  [2];  [1];  [3]
  1. Univ. of Chicago, IL (United States)
  2. Univ. of Maryland, College Park, MD (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Univ. of Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
OSTI Identifier:
1735346
Alternate Identifier(s):
OSTI ID: 1785364
Grant/Contract Number:  
SC0009924; PHY1620074; AC02-06CH11357; SC0013642; PHY-1607611
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2020; Journal Issue: 11; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Beyond Standard Model; Higgs Physics

Citation Formats

Liu, Jia, Liu, Zhen, Wang, Lian-Tao, and Wang, Xiao-Ping. Enhancing sensitivities to long-lived particles with high granularity calorimeters at the LHC. United States: N. p., 2020. Web. https://doi.org/10.1007/jhep11(2020)066.
Liu, Jia, Liu, Zhen, Wang, Lian-Tao, & Wang, Xiao-Ping. Enhancing sensitivities to long-lived particles with high granularity calorimeters at the LHC. United States. https://doi.org/10.1007/jhep11(2020)066
Liu, Jia, Liu, Zhen, Wang, Lian-Tao, and Wang, Xiao-Ping. Fri . "Enhancing sensitivities to long-lived particles with high granularity calorimeters at the LHC". United States. https://doi.org/10.1007/jhep11(2020)066. https://www.osti.gov/servlets/purl/1735346.
@article{osti_1735346,
title = {Enhancing sensitivities to long-lived particles with high granularity calorimeters at the LHC},
author = {Liu, Jia and Liu, Zhen and Wang, Lian-Tao and Wang, Xiao-Ping},
abstractNote = {The search for long-lived particles (LLP) is an exciting physics opportunity in the upcoming runs of the Large Hadron Collider. In this paper, we focus on a new search strategy of using the High Granularity Calorimeter (HGCAL), part of the upgrade of the CMS detector, in such searches. In particular, we demonstrate that the high granularity of the calorimeter allows us to see “shower tracks” in the calorimeter, and can play a crucial role in identifying the signal and suppressing the background. We study the potential reach of the HGCAL using a signal model in which the Standard Model Higgs boson decays into a pair of LLPs, h → XX. After carefully estimating the Standard Model QCD and the misreconstructed fake-track backgrounds, we give the projected reach for both an existing vector boson fusion trigger and a novel displaced-track-based trigger. Our results show that the best reach for the Higgs decay branching ratio, BR(h → XX), in the vector boson fusion channel is about O(10–4) with lifetime cτX ~ 0.1–1 meters, while for the gluon gluon fusion channel it is about O(10–5 – 10–6) for similar lifetimes. For longer lifetime cτX ~ 103 meters, our search could probe BR(h → XX) down to a few ×10–4(10–2) in the gluon gluon fusion (vector boson fusion) channels, respectively. In comparison with these previous searches, our new search shows enhanced sensitivity in complementary regions of the LLP parameter space. We also comment on many improvements can be implemented to further improve our proposed search.},
doi = {10.1007/jhep11(2020)066},
journal = {Journal of High Energy Physics (Online)},
number = 11,
volume = 2020,
place = {United States},
year = {2020},
month = {11}
}

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