Flavor-changing neutral current in production and decay of pseudoscalar mesons in a type III two-Higgs-doublet-model with four-texture Yukawa couplings

Gómez‐Bock, M.; López-Castro, G.; López-Lozano, L.; Rosado, A.

doi:10.1103/physrevd.80.055017

Cited by 13 publications

(2 citation statements)

References 43 publications

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“…As one knowns, the 2HDM-III is a generic description of particle physics at a higher energy scale ( TeV), and its imprint at low energies is reflected in Yukawa couplings structure. A detailed study of Yukawa Lagrangian within the 2HDM-III is given in [23,24,40,46,47], while the phenomenological implications of this model in scalar sector including Lepton Violation (LV) and/or FCNC's are presented in [48][49][50]. In these works, the FCNC's are under control because the authors have been assuming that Yukawa matrices in the weak and mass basis, are represented by means of an Hermitian matrix with two texture zeroes and the Cheng-Sher ansatz, respectively.…”

Section: B the Mass And Mixing Matrices As Function Of Fermion Massesmentioning

confidence: 99%

Lepton CP violation in a ν2HDM with flavor

et al. 2018

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In this work we propose an extension to the Standard Model in which we consider the model 2HDM type-III plus massive neutrinos and the horizontal flavor symmetry S3 (ν2HDM⊗S3). In the above framework and with the explicit breaking of flavor symmetry S3, the Yukawa matrices in the flavor adapted basis are represented by means of a matrix with two texture zeroes. Also, the active neutrinos are considered as Majorana particles and their masses are generated through type-I seesaw mechanism. The unitary matrices that diagonalize the mass matrices, as well as the flavor mixing matrices, are expressed in terms of fermion mass ratios. Consequently, in the mass basis the entries of the Yukawa matrices naturally acquire the form of the so-called Cheng-Sher ansatz. For the leptonic sector of ν2HDM⊗S3, we compare, through a χ 2 likelihood test, the theoretical expressions of the flavor mixing angles with the masses and flavor mixing leptons current experimental data.The results obtained in this χ 2 analysis are in very good agreement with the current experimental data. We also obtained an allowed value ranges for the "Dirac-like" phase factor, as well as for the two Majorana phase factors. Furthermore, we study the phenomenological implications of these numerical values of the CP-violation phases on the neutrinoless double beta decay, and for Long Base-Line neutrino oscillation experiments such as T2K, NOνA, and DUNE.the Yukawa matrix entries and the parameters used to compute the decay widths and cross section, without losing the terms proportional to the light fermion masses. Specifically, considering a zero texture Yukawa matrix, one obtains the Cheng-Sher ansatz for flavor mix couplings, widely used in literature, where flavored couplings are considered proportional to the involved fermion masses [31].The matter content in the 2HDM is divided among the quarks and leptons sectors. In turn these sectors are subdivided in two sectors, the up-and down-type for quarks sector, while charged leptons and neutrinos for the leptons sector. The fermions in each one of these subsectors are analogous each other, because they have completely identical couplings to all gauge bosons, although their mass values are not the same. Therefore, before of the spontaneous symmetry breaking (SSB), the Yukawa Lagrangian in the above subsectors is invariant under permutations of flavor indices. In other words, each one of these subsectors is invariant under the action of a S 3 symmetry group. This symmetry group has only three irreducible representations that correspond to two singlets and a doublet [32,33].On the other hand, obtained from the experimental data, the mass spectrum for Dirac fermions obeys the following

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Section: B the Mass And Mixing Matrices As Function Of Fermion Massesmentioning

confidence: 99%

Lepton CP violation in a ν2HDM with flavor

et al. 2018

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“…We have inspired in the Yukawa couplings structure coming from textures (see eq. ( 4)), which are dependent on the one parameter related to the quark type [1,40].…”

Section: Branching Ratios For the Lightest Neutral Scalarmentioning

confidence: 99%

Probing flavor parameters in the scalar sector and new bounds for the fermion sector

Gaitán,

de Oca,

Orduz-Ducuara

2017

Preprint

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In this paper we study the Flavor-Changing mediated by Higgs boson within Two-Higgs Doublet Model-III context. We explore the parameter space and, considering recent results, find new limits for the model parameters. We also obtain the total Higgs decay width and the branching ratios for different channels taking limits for the t → cV and b → sγ processes. Considering different constraints, we estimate the branching ratio for the h → t * c in the model as well as the bounds for the b → sγ, h → µτ and h → γZ. Considering the quark top decays to W b, we obtained Br(h → W c b) ∼ 10 −3 .

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LFV couplings of the extra gauge bosonZ′and leptonic decay and production of pseudoscalar mesons

Yue

Cui

2014

Nuclear Physics B

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Considering the constraints of the lepton flavor violating (LFV) processes μ → 3e and τ → 3μ on the LFV couplings Z i j , in the contexts of the E 6 models, the left-right (LR) models, the "alternative" left-right (ALR) models and the 331 models, we investigate the contributions of the extra gauge boson Z to the decay rates of the processes i → j ν ν , τ → μP and P → μe with P = π 0 , η and η . Our numerical results show that the maximal values of the branching ratios for these processes are not dependent on the Z mass M Z at leader order. The extra gauge boson Z X predicted by the E 6 models can make the maximum value of the branching ratio Br(τ → μν ν ) reach 1.1 × 10 −7 . All Z models considered in this paper can produce significant contributions to the process τ → μP . However, the value of Br(P → μe) is far below its corresponding experimental upper bound.

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Flavor-changing neutral current in production and decay of pseudoscalar mesons in a type III two-Higgs-doublet-model with four-texture Yukawa couplings

Cited by 13 publications

References 43 publications

Lepton CP violation in a ν2HDM with flavor

Lepton CP violation in a ν2HDM with flavor

Probing flavor parameters in the scalar sector and new bounds for the fermion sector

LFV couplings of the extra gauge bosonZ′and leptonic decay and production of pseudoscalar mesons

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