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Title: High scale flavor alignment in two-Higgs doublet models and its phenomenology

Abstract

The most general two-Higgs doublet model (2HDM) includes potentially large sources of flavor changing neutral currents (FCNCs) that must be suppressed in order to achieve a phenomenologically viable model. The flavor alignment ansatz postulates that all Yukawa coupling matrices are diagonal when expressed in the basis of mass-eigenstate fermion fields, in which case tree-level Higgs-mediated FCNCs are eliminated. In this work, we explore models with the flavor alignment condition imposed at a very high energy scale, which results in the generation of Higgs-mediated FCNCs via renormalization group running from the high energy scale to the electroweak scale. Using the current experimental bounds on flavor changing observables, constraints are derived on the aligned 2HDM parameter space. In the favored parameter region, we analyze the implications for Higgs boson phenomenology.

Authors:
 [1];  [2];  [2]
  1. Univ. of Cincinnati, OH (United States). Dept. of Physics
  2. Univ. of California, Santa Cruz, CA (United States). Santa Cruz Inst. for Particle Physics
Publication Date:
Research Org.:
Univ. of California, Santa Cruz, CA (United States); Univ. of Cincinnati, OH (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); National Science Foundation (NSF)
OSTI Identifier:
1424020
Grant/Contract Number:
SC0010107; PHY11-25915; PHY-1066293
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2017; Journal Issue: 6; 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; Higgs physics

Citation Formats

Gori, Stefania, Haber, Howard E., and Santos, Edward. High scale flavor alignment in two-Higgs doublet models and its phenomenology. United States: N. p., 2017. Web. doi:10.1007/JHEP06(2017)110.
Gori, Stefania, Haber, Howard E., & Santos, Edward. High scale flavor alignment in two-Higgs doublet models and its phenomenology. United States. doi:10.1007/JHEP06(2017)110.
Gori, Stefania, Haber, Howard E., and Santos, Edward. Wed . "High scale flavor alignment in two-Higgs doublet models and its phenomenology". United States. doi:10.1007/JHEP06(2017)110. https://www.osti.gov/servlets/purl/1424020.
@article{osti_1424020,
title = {High scale flavor alignment in two-Higgs doublet models and its phenomenology},
author = {Gori, Stefania and Haber, Howard E. and Santos, Edward},
abstractNote = {The most general two-Higgs doublet model (2HDM) includes potentially large sources of flavor changing neutral currents (FCNCs) that must be suppressed in order to achieve a phenomenologically viable model. The flavor alignment ansatz postulates that all Yukawa coupling matrices are diagonal when expressed in the basis of mass-eigenstate fermion fields, in which case tree-level Higgs-mediated FCNCs are eliminated. In this work, we explore models with the flavor alignment condition imposed at a very high energy scale, which results in the generation of Higgs-mediated FCNCs via renormalization group running from the high energy scale to the electroweak scale. Using the current experimental bounds on flavor changing observables, constraints are derived on the aligned 2HDM parameter space. In the favored parameter region, we analyze the implications for Higgs boson phenomenology.},
doi = {10.1007/JHEP06(2017)110},
journal = {Journal of High Energy Physics (Online)},
number = 6,
volume = 2017,
place = {United States},
year = {Wed Jun 21 00:00:00 EDT 2017},
month = {Wed Jun 21 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
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Citation Metrics:
Cited by: 5works
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  • A comprehensive phenomenological analysis of a two Higgs doublet model, with flavor-changing scalar currents at the tree level, called model III, is presented. Constraints from existing experimental information especially on {Delta}F=2 processes are systematically incorporated. Constraints emerging from rare B decays, Z{r_arrow}b{bar b}, and the {rho} parameter are also examined. Experimental implications for e{sup +}e{sup {minus}}({mu}{sup +}{mu}{sup {minus}}){r_arrow}t{bar c}+{bar t}c, t{r_arrow}c{gamma}(Z,g), D{sup 0}-{bar D}{sup 0}, and B{sub s}{sup 0}-{bar B}{sub s}{sup 0} oscillations, and for e{sup +}e{sup {minus}}(Z){r_arrow}b{bar s}+{bar b}s are investigated and experimental effort towards these is stressed. We also emphasize the importance of clarifying the experimental issues pertainingmore » to Z{r_arrow}b{bar b}. {copyright} {ital 1997} {ital The American Physical Society}« less
  • A comprehensive phenomenological analysis of a two Higgs doublet model, with flavor changing scalar currents at the tree level, called model III, is presented. Constraints from existing experimental information especially on {Delta}F=2 processes are systematically incorporated. Constraints emerging from rare B-decays, Z {r_arrow} b{anti b}, and the {rho}-parameter are also examined. Experimental implications for e{sup +}e ({mu}{sup +}{mu}) {r_arrow} t{anti c} + {anti t}c, t {r_arrow} c{gamma}(Z,g), D{sup 0}-{anti D}{sup 0}, and B{sub s}{sup 0}-{anti B}{sub s}{sup 0} oscillations, and for e{sup +}e (Z) {r_arrow} b{anti s} + {anti b}s are investigated and experimental effort towards these is stressed. Theymore » also emphasize the importance of clarifying the experimental issues pertaining to Z {r_arrow} b{anti b}.« less
  • Possible models of Yukawa interaction are discussed in the two Higgs doublet model (THDM) under the discrete symmetry imposed to avoid the flavor changing neutral current at the leading order. It is known that there are four types of such models corresponding to the possible different assignment of charges for the discrete symmetry on quarks and leptons. We first examine the decay properties of Higgs bosons in each type model, and summarize constraints on the models from current experimental data. We then shed light on the differences among these models in collider phenomenology. In particular, we mainly discuss the so-calledmore » type-II THDM and type-X THDM. The type-II THDM corresponds to the model with the same Yukawa interaction as the minimal supersymmetric standard model. On the other hand, in the type-X THDM, additional Higgs bosons can predominantly decay into leptons. This scenario may be interesting because of the motivation for a light charged Higgs boson scenario such as in the TeV-scale model of neutrinos, dark matter, and baryogenesis. We study how we can distinguish the type-X THDM from the minimal supersymmetric standard model at the Large Hadron Collider and the International Linear Collider.« less
  • We consider constraints from flavor physics on two-Higgs-doublet models (2HDM) with general, flavor-diagonal, Yukawa couplings. Analyzing the charged Higgs contribution to different observables, we find that b{yields}s{gamma} transitions and {Delta}M{sub B{sub d}} restrict the coupling {lambda}{sub tt} of the top quark (corresponding to cot{beta} in models with a Z{sub 2} symmetry) to |{lambda}{sub tt}|<1 for m{sub H}{sup +} < or approx. 500 GeV. Stringent constraints from B meson decays are obtained also on the other third generation couplings {lambda}{sub bb} and {lambda}{sub {tau}{tau},} but with stronger dependence on m{sub H}{sup +}. For the second generation, we obtain constraints on combinationsmore » of {lambda}{sub ss}, {lambda}{sub cc}, and {lambda}{sub {mu}{mu}}from leptonic K and D{sub s} decays. The limits on the general couplings are translated to the common 2HDM types I-IV with a Z{sub 2} symmetry, and presented on the (m{sub H}{sup +},tan{beta}) plane. The flavor constraints are most excluding in the type II model which lacks a decoupling limit in tan{beta}. We obtain a lower limit m{sub H}{sup +} > or approx. 300 GeV in models of type II and III, while no lower bound on m{sub H}{sup +} is found for types I and IV.« less
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