Flavor-changing leptonic decays of heavy Higgs bosons

Sher, Marc; Thrasher, Keith

doi:10.1103/physrevd.93.055021

Cited by 32 publications

(24 citation statements)

References 47 publications

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“…[9], we show now some phenomenological results on HLFV in the type-III 2HDM. We refer to [31,34,42,46,47,53,56,72,76,78,87,89,124] for additional HLFV phenomenological studies in the 2HDM.…”

Section: Hlfv Phenomenologymentioning

confidence: 99%

Higgs Lepton Flavor Violating Decays in Two Higgs Doublet Models

Vicente

2019

Front. Phys.

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The discovery of a non-zero rate for a lepton flavor violating decay mode of the Higgs boson would definitely be an indication of New Physics. We review the prospects for such signal in Two Higgs Doublet Models, in particular for Higgs boson decays into τ µ final states. We will show that this scenario contains all the necessary ingredients to provide large flavor violating rates and still be compatible with the stringent limits from direct searches and low-energy flavor experiments.1

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Section: Hlfv Phenomenologymentioning

confidence: 99%

Higgs Lepton Flavor Violating Decays in Two Higgs Doublet Models

Vicente

2019

Front. Phys.

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“…Flavor-conserving or flavor-blind Higgs observables can be accommodated in both categories because the new couplings, compared to the SM couplings, i.e., the coupling modifiers κ Z , κ W , κ t , κ τ , κ b , κ g and κ γ may deviate from 1 at the percent level. These models have been extensively studied in the literature [8][9][10][11][12]. In the Higgs sector the most relevant prediction specific to top models is the decay h → bs þ sb with branching ratios at most between 10 −3 and 10 −2 [11].…”

Section: Adding a Second Higgs Doubletmentioning

confidence: 99%

“…1, we show a diagram contributing, in the down sector, to the leading higher order operators in Eq. (12).…”

Section: Tev Completionmentioning

confidence: 99%

“…We then conjecture that the generation of the mass of the first two generations arises from a different source. If this new source is just another Higgs doublet and if one assumes that the new doublet is neutral with respect to the symmetry S, then one is led to a flavor structure analogous to what one encounters in a class of models [4,5] known as BrancoGrimus-Lavoura (BGL), which have been extensively analyzed in the literature [6][7][8][9][10][11][12]. If, on the other hand, the new contribution arises in the framework of an effective field theory where the new physics (NP) particles have been integrated out, then assuming that this NP contribution is of order m s and m c in the down and up sectors, one can estimate the couplings of the Standard Higgs to tt, bb, cc, ss.…”

Section: Introductionmentioning

confidence: 99%

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What if the masses of the first two quark families are not generated by the standard model Higgs boson?

et al. 2016

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We point out that in the standard model there is meaningful quark mixing even in the extreme chiral (EC) limit, where only the third generation of quarks acquires mass. This mixing is in general expected to be of order 1 and the fact that jV 13 j 2 þ jV 23 j 2 ≈ 1.6 × 10 −3 implies a novel fine-tuning problem in the SM which we point out for the first time. We propose a possible way of avoiding this fine-tuning by introducing a symmetry S which leads to V CKM ¼ 1, with only the third generation of quarks acquiring mass. We consider two scenarios for generating the mass of the first two quark generations and full quark mixing based on the assumption that the masses of the first two quark families are not generated by the standard Higgs. One consists of the introduction of a second Higgs doublet which is neutral under S. The second scenario consists of assuming new physics at a high energy scale, contributing to the masses of light quark generations, in an effective field theory approach. This last scenario leads to couplings of the Higgs particle to ss and cc which are significantly enhanced with respect to those of the SM. In both schemes, one has scalar-mediated flavor-changing neutral currents which are naturally suppressed. Flavor-violating top decays are predicted in the second scenario at the level Brðt → hcÞ ≥ 5 × 10 −5 .

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“…The Yukawa structure of the F2HDM can be for example generated via the flavor-locking mechanism [23,24], and the implied collider phenomenology has been discussed in detail in [25]. Variations of the original F2HDM with alternative flavor structures were explored in [26] (for additional recent work on extended Higgs sectors with non-standard flavor structures see [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41]).…”

Section: Introductionmentioning

confidence: 99%

Rare top decays as probes of flavorful Higgs bosons

2019

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We study a version of Two Higgs Doublet Models with non-standard flavor violation in the up quark sector. We find branching ratios for the rare top decays t → hc and t → hu that are within reach of current and future colliders, while other flavor constraints from rare B decays and neutral D meson mixing, as well as constraints from Higgs signal strength measurements remain under control. The most prominent collider signature of the considered setup is pp → tH → ttc, providing continued motivation to search for same-sign tops at the LHC as well as a simple framework to interpret these searches. As a byproduct of our study, we provide updated SM predictions for the rare top decays BR(t → hc) SM = (4.19 +1.08 −0.80 ± 0.16) × 10 −15 and BR(t → hu) SM = (3.66 +0.94 −0.70 ± 0.67) × 10 −17 with the main uncertainties coming from higher order QCD and CKM matrix elements. *

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Flavor-changing leptonic decays of heavy Higgs bosons

Cited by 32 publications

References 47 publications

Higgs Lepton Flavor Violating Decays in Two Higgs Doublet Models

Higgs Lepton Flavor Violating Decays in Two Higgs Doublet Models

What if the masses of the first two quark families are not generated by the standard model Higgs boson?

Rare top decays as probes of flavorful Higgs bosons

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