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Title: Multi-Higgs doublet models: the Higgs-fermion couplings and their sum rules

Abstract

This is the second of a series of papers that explores the physical parameterization, sum rules and unitarity bounds arising from a non-minimal scalar sector of the Standard Model (SM) that consists of N Higgs doublets. In this paper, we focus on the structure and implication of the Yukawa interactions that couple the N scalar doublets to the SM fermions. We employ the charged Higgs basis, which is defined as the basis of scalar fields such that the neutral scalar field vacuum expectation value resides entirely in one of the N scalar doublet fields, and the charged components of the remaining N – 1 scalar doublet fields are the physical (mass-eigenstate) charged Higgs fields. Based on the structure of the Yukawa Lagrangian of the model (and as a consequence of tree-level unitarity), one may deduce numerous sum rules, several of which have not appeared previously in the literature. Furthermore, these sum rules can be used to uncover intimate relations between the structure of the Higgs-fermion couplings and the scalar/gauge couplings. In particular, we show that the approximate alignment limit, in which the W + W and ZZ couplings to the observed Higgs boson are approximately SM-like, imposes significant constraintsmore » on the Higgs-fermion couplings.« less

Authors:
 [1];  [2];  [1];  [1]
  1. Univ. de Lisboa, Lisboa (Portugal)
  2. Univ. of California, Santa Cruz, CA (United States)
Publication Date:
Research Org.:
Univ. of California, Santa Cruz, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1483940
Grant/Contract Number:  
SC0010107
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Volume: 2018; Journal Issue: 10; 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

Bento, Miguel P., Haber, Howard E., Romão, Jorge C., and Silva, João P. Multi-Higgs doublet models: the Higgs-fermion couplings and their sum rules. United States: N. p., 2018. Web. doi:10.1007/JHEP10(2018)143.
Bento, Miguel P., Haber, Howard E., Romão, Jorge C., & Silva, João P. Multi-Higgs doublet models: the Higgs-fermion couplings and their sum rules. United States. doi:10.1007/JHEP10(2018)143.
Bento, Miguel P., Haber, Howard E., Romão, Jorge C., and Silva, João P. Tue . "Multi-Higgs doublet models: the Higgs-fermion couplings and their sum rules". United States. doi:10.1007/JHEP10(2018)143. https://www.osti.gov/servlets/purl/1483940.
@article{osti_1483940,
title = {Multi-Higgs doublet models: the Higgs-fermion couplings and their sum rules},
author = {Bento, Miguel P. and Haber, Howard E. and Romão, Jorge C. and Silva, João P.},
abstractNote = {This is the second of a series of papers that explores the physical parameterization, sum rules and unitarity bounds arising from a non-minimal scalar sector of the Standard Model (SM) that consists of N Higgs doublets. In this paper, we focus on the structure and implication of the Yukawa interactions that couple the N scalar doublets to the SM fermions. We employ the charged Higgs basis, which is defined as the basis of scalar fields such that the neutral scalar field vacuum expectation value resides entirely in one of the N scalar doublet fields, and the charged components of the remaining N – 1 scalar doublet fields are the physical (mass-eigenstate) charged Higgs fields. Based on the structure of the Yukawa Lagrangian of the model (and as a consequence of tree-level unitarity), one may deduce numerous sum rules, several of which have not appeared previously in the literature. Furthermore, these sum rules can be used to uncover intimate relations between the structure of the Higgs-fermion couplings and the scalar/gauge couplings. In particular, we show that the approximate alignment limit, in which the W+W– and ZZ couplings to the observed Higgs boson are approximately SM-like, imposes significant constraints on the Higgs-fermion couplings.},
doi = {10.1007/JHEP10(2018)143},
journal = {Journal of High Energy Physics (Online)},
issn = {1029-8479},
number = 10,
volume = 2018,
place = {United States},
year = {2018},
month = {10}
}

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