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Bonilla, César; Modak, Tanmoy; Srivastava, Rahul; Valle, J. W. F.

doi:10.1103/physrevd.98.095002

Cited by 73 publications

(67 citation statements)

References 117 publications

(131 reference statements)

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“…A possible explanation of these anomalies may be provided by the introduction of a gauge boson associated with the U (1) Lµ−Lτ symmetry [13][14][15][16][17][18][19][20][21][22] or other flavor symmetry [23][24][25][26].…”

Section: Searches For Higgs Boson Resonances Produced In Association mentioning

confidence: 99%

A light Higgs at the LHC and the B-anomalies

Liu

Wagner

et al. 2018

J. High Energ. Phys.

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After the Higgs discovery, the LHC has been looking for new resonances, decaying into pairs of Standard Model (SM) particles. Recently, the CMS experiment observed an excess in the di-photon channel, with a di-photon invariant mass of about 96 GeV. This mass range is similar to the one of an excess observed in the search for the associated production of Higgs bosons with the Z neutral gauge boson at LEP, with the Higgs bosons decaying to bottom quark pairs. On the other hand, the LHCb experiment observed a discrepancy with respect to the SM expectations of the ratio of the decay of B-mesons to K-mesons and a pair of leptons,. This observation provides a hint of the violation of lepton-flavor universality in the charged lepton sector and may be explained by the existence of a vector boson originating form a U(1) Lµ−Lτ symmetry and heavy quarks that mix with the left-handed down quarks. Since the coupling to heavy quarks could lead to sizable Higgs di-photon rates in the gluon fusion channel, in this article we propose a common origin of these anomalies identifying a Higgs associated with the breakdown of the U(1) Lµ−Lτ symmetry and at the same time responsible to the quark mixing, with the one observed at the LHC. We also discuss the constraints on the identification of the same Higgs with the one associated with the bottom quark pair excess observed at LEP.

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Section: Searches For Higgs Boson Resonances Produced In Association mentioning

confidence: 99%

A light Higgs at the LHC and the B-anomalies

Liu

Wagner

et al. 2018

J. High Energ. Phys.

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show abstract

“…Depending on the case and on which set of observables is included in the global fit, BSM interpretations at the tree level have involved the exchange of a heavy Z boson (see Refs. [30][31][32][33][34][35][36][37] for early studies) or of a leptoquark (studies include Refs. [38][39][40][41][42][43][44][45][46][47][48][49][50][51][52]), both with non-universal and flavor-violating couplings to leptons and quarks.…”

Section: Introductionmentioning

confidence: 99%

Implications for new physics in $$b\rightarrow s \mu \mu $$ transitions after recent measurements by Belle and LHCb

2019

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We present a Bayesian analysis of the implications for new physics in semileptonic b → s transitions after including new measurements of R K at LHCb and new determinations of R K * and R K * + at Belle. We perform global fits with 1, 2, 4, and 8 input Wilson coefficients, plus one CKM nuisance parameter to take into account uncertainties that are not factorizable. We infer the 68% and 95.4% credibility regions of the marginalized posterior probability density for all scenarios and perform comparisons of models in pairs by calculating the Bayes factor given a common data set. We then proceed to analyzing a few well-known BSM models that can provide a high energy framework for the EFT analysis. These include the exchange of a heavy Z boson in models with heavy vector-like fermions and a scalar field, and a model with scalar leptoquarks. We provide predictions for the BSM couplings and expected mass values.

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“…[9] for a definition of these coefficients), are sufficient to explain observations. On the other hand, numerous model-specific explanations for some or all of the data have also been offered, including Z , flavour symmetric, leptoquark, composite-and multi-higgs approaches [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Some of these models, e.g.…”

Section: Introductionmentioning

confidence: 99%

Simplified models of flavourful leptoquarks

Varzielas

Talbert

2019

Eur. Phys. J. C

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We study the implications of single leptoquark extensions of the Standard Model (SM) under the assumption that their enhanced Yukawa sectors are invariant under global Abelian flavour symmetries already present in SM mass terms. Such symmetries, assumed to be the 'residual' subgroups of an ultra-violet flavour theory, have previously been considered in order to predict fermionic mixing angles. Here we focus instead on their effect on the novel flavour structures sourced by the leptoquark representations that address the present R K ( ) anomalies in semileptonic rare B-decays. Combined with existing flavour data, the residual symmetries prove to be extremely constraining; we find that the (quark-lepton) leptoquark Yukawa couplings fall within O(10) highly predictive patterns, each with only a single free parameter, when 'normal' (SM-like) hierarchies are assumed. In addition, proton decay for the scalar SU(2) triplet representation is naturally avoided in the residual symmetry approach without relying on further model building. Our results indicate that a simultaneous explanation for the R K ( ) anomalies and the flavour puzzle may be achieved in a simplified, model-independent formalism.

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U(1)B3−3L2

Cited by 73 publications

References 117 publications

A light Higgs at the LHC and the B-anomalies

A light Higgs at the LHC and the B-anomalies

Implications for new physics in $$b\rightarrow s \mu \mu $$ transitions after recent measurements by Belle and LHCb

Simplified models of flavourful leptoquarks

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