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Title: Hunting for vectorlike quarks

Abstract

We analyze decays of vectorlike quarks in extensions of the standard model and a two Higgs doublet model. We identify several typical patterns of branching ratios of the lightest new up-type quark, t 4, and down-type quark, b 4, depending on the structure of Yukawa couplings that mix the vectorlike and standard model quarks (we assume only mixing with the third generation) and also on their doublet or singlet nature. We find that decays into heavy neutral or charged Higgs bosons, when kinematically open, can easily dominate and even be close to 100%: b 4Hb at medium to large tan β, t 4Ht at small tan β and b 4H ± t, t 4H ± b at both large and small tan β. The pair production of vectorlike quarks leads to 6 t, 4 t2 b, 2 t4 b and 6 b final states. The decay modes into W, Z and h follow the pattern expected from the Goldstone boson equivalence limit that we generalize to scenarios with all possible couplings. We also discuss in detail the structure of Yukawa couplings required to significantly deviate from the pattern characteristic of the Goldstonemore » boson equivalence limit that can result in essentially arbitrary branching ratios.« less

Authors:
 [1];  [1];  [2]
  1. Indiana Univ., Bloomington, IN (United States)
  2. Univ. of Chicago, IL (United States). Enrico Fermi Inst.; Yonsei Univ., Seoul (Korea)
Publication Date:
Research Org.:
Indiana Univ., Bloomington, IN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); National Science Foundation (NSF); National Research Foundation of Korea (NRF)
OSTI Identifier:
1597045
Grant/Contract Number:  
SC0010120; PHY-1607611; NRF-2017R1D1A1B03032076; 2016R1A2B2016112)
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Volume: 2019; Journal Issue: 4; 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; Heavy Quark Physics

Citation Formats

Dermíšek, Radovan, Lunghi, Enrico, and Shin, Seodong. Hunting for vectorlike quarks. United States: N. p., 2019. Web. doi:10.1007/JHEP04(2019)019.
Dermíšek, Radovan, Lunghi, Enrico, & Shin, Seodong. Hunting for vectorlike quarks. United States. doi:10.1007/JHEP04(2019)019.
Dermíšek, Radovan, Lunghi, Enrico, and Shin, Seodong. Tue . "Hunting for vectorlike quarks". United States. doi:10.1007/JHEP04(2019)019. https://www.osti.gov/servlets/purl/1597045.
@article{osti_1597045,
title = {Hunting for vectorlike quarks},
author = {Dermíšek, Radovan and Lunghi, Enrico and Shin, Seodong},
abstractNote = {We analyze decays of vectorlike quarks in extensions of the standard model and a two Higgs doublet model. We identify several typical patterns of branching ratios of the lightest new up-type quark, t4, and down-type quark, b4, depending on the structure of Yukawa couplings that mix the vectorlike and standard model quarks (we assume only mixing with the third generation) and also on their doublet or singlet nature. We find that decays into heavy neutral or charged Higgs bosons, when kinematically open, can easily dominate and even be close to 100%: b4 → Hb at medium to large tan β, t4 → Ht at small tan β and b4 → H±t, t4 → H±b at both large and small tan β. The pair production of vectorlike quarks leads to 6t, 4t2b, 2t4b and 6b final states. The decay modes into W, Z and h follow the pattern expected from the Goldstone boson equivalence limit that we generalize to scenarios with all possible couplings. We also discuss in detail the structure of Yukawa couplings required to significantly deviate from the pattern characteristic of the Goldstone boson equivalence limit that can result in essentially arbitrary branching ratios.},
doi = {10.1007/JHEP04(2019)019},
journal = {Journal of High Energy Physics (Online)},
issn = {1029-8479},
number = 4,
volume = 2019,
place = {United States},
year = {2019},
month = {4}
}

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