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Title: Cascade decays of heavy Higgs bosons through vectorlike quarks in two Higgs doublet models

Abstract

We study cascade decays of heavy neutral Higgs bosons through vectorlike quarks. We focus on scenarios where decay modes into pairs of vectorlike quarks are not kinematically open which extends the sensitivity of the LHC to larger masses. Assuming only mixing with the third family of standard model quarks the new decay modes of heavy Higgs bosons are: H → t4t → Wbt, Ztt, htt and H → b4b → Wtb, Zbb, hbb, where t4 (b4) is the new up-type (down-type) quark mass eigenstate. In the numerical analysis we assume the CP even Higgs boson in the two Higgs doublet model type-II but the signatures are relevant for many other scenarios. We identify the region of the parameter space where these decay modes are significant or can even dominate, and thus they provide the best opportunities for the simultaneous discovery of a new Higgs boson and vectorlike quarks. We further explore the reach of the High Luminosity LHC for two representative decay modes, t4→ Zt → ℓℓt and b4→ Zb → ℓℓb, and found that cross sections at a 0.1 fb level can be probed with simple cut based analyses. We also find that the rates for Higgs cascade decaysmore » can be much larger than the rates for a single production of vectorlike quarks. Furthermore, the reach for vectorlike quarks in Higgs cascade decays and pair production extends to comparable masses.« less

Authors:
 [1];  [1];  [2]
  1. Indiana Univ., Bloomington, IN (United States). Physics Dept.
  2. Univ. of Chicago, IL (United States). Enrico Fermi Inst.; Yonsei Univ., Seoul (Korea, Republic of). Institute of Physics and Applied Physics (IPAP); Inst. of Basic Science, Daejeon (Korea, Republic of). Center for Theoretical Physics of the Universe; Jeonbuk National Univ., Jeonju, Jeonbuk (Korea, Republic of). Dept. of Physics
Publication Date:
Research Org.:
Indiana Univ., Bloomington, IN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1802057
Alternate Identifier(s):
OSTI ID: 1836475
Grant/Contract Number:  
SC0010120
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: 3; Journal ID: ISSN 1029-8479
Publisher:
Springer Nature
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Physics

Citation Formats

Dermisek, Radovan, Lunghi, Enrico, and Shin, Seodong. Cascade decays of heavy Higgs bosons through vectorlike quarks in two Higgs doublet models. United States: N. p., 2020. Web. doi:10.1007/jhep03(2020)029.
Dermisek, Radovan, Lunghi, Enrico, & Shin, Seodong. Cascade decays of heavy Higgs bosons through vectorlike quarks in two Higgs doublet models. United States. https://doi.org/10.1007/jhep03(2020)029
Dermisek, Radovan, Lunghi, Enrico, and Shin, Seodong. Thu . "Cascade decays of heavy Higgs bosons through vectorlike quarks in two Higgs doublet models". United States. https://doi.org/10.1007/jhep03(2020)029. https://www.osti.gov/servlets/purl/1802057.
@article{osti_1802057,
title = {Cascade decays of heavy Higgs bosons through vectorlike quarks in two Higgs doublet models},
author = {Dermisek, Radovan and Lunghi, Enrico and Shin, Seodong},
abstractNote = {We study cascade decays of heavy neutral Higgs bosons through vectorlike quarks. We focus on scenarios where decay modes into pairs of vectorlike quarks are not kinematically open which extends the sensitivity of the LHC to larger masses. Assuming only mixing with the third family of standard model quarks the new decay modes of heavy Higgs bosons are: H → t4t → Wbt, Ztt, htt and H → b4b → Wtb, Zbb, hbb, where t4 (b4) is the new up-type (down-type) quark mass eigenstate. In the numerical analysis we assume the CP even Higgs boson in the two Higgs doublet model type-II but the signatures are relevant for many other scenarios. We identify the region of the parameter space where these decay modes are significant or can even dominate, and thus they provide the best opportunities for the simultaneous discovery of a new Higgs boson and vectorlike quarks. We further explore the reach of the High Luminosity LHC for two representative decay modes, t4→ Zt → ℓℓt and b4→ Zb → ℓℓb, and found that cross sections at a 0.1 fb level can be probed with simple cut based analyses. We also find that the rates for Higgs cascade decays can be much larger than the rates for a single production of vectorlike quarks. Furthermore, the reach for vectorlike quarks in Higgs cascade decays and pair production extends to comparable masses.},
doi = {10.1007/jhep03(2020)029},
journal = {Journal of High Energy Physics (Online)},
number = 3,
volume = 2020,
place = {United States},
year = {Thu Mar 05 00:00:00 EST 2020},
month = {Thu Mar 05 00:00:00 EST 2020}
}

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