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Explaining h→μ(±)τ(∓), B→K*μ(+)μ(-), and B→Kμ(+)μ(-)/B→Ke(+)e(-) in a Two-Higgs-Doublet Model with Gauged L(μ)-L(τ).

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Three anomalies in particle physics, including B→K*μ(+)μ(-) and R(K) ratios, may be explained by a single two-Higgs-doublet model with gauged L(μ)-L(τ) symmetry. This model simultaneously addresses deviations in Higgs decays (h→μτ) and B-meson flavor observables.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Beyond Standard Model Physics

Background:

  • The Large Hadron Collider (LHC) has observed three significant deviations from the Standard Model (SM) in flavor-changing processes.
  • Specifically, anomalies have been reported in B-meson decays (B→K*μ(+)μ(-)) and the ratio R(K) by LHCb, and in Higgs boson decays (h→μτ) by CMS.

Purpose of the Study:

  • To investigate a single theoretical framework that can simultaneously explain the observed deviations in flavor observables and Higgs decays.
  • To propose a well-motivated model that reconciles these discrepancies with Standard Model predictions.

Main Methods:

  • The study explores a two-Higgs-doublet model (2HDM) incorporating a gauged L(μ)-L(τ) symmetry.
  • Theoretical calculations and phenomenological analyses are performed to assess the model's consistency with experimental constraints.

Main Results:

  • The proposed 2HDM with gauged L(μ)-L(τ) symmetry successfully explains the anomalies in h→μτ, B→K*μ(+)μ(-), and R(K) concurrently.
  • The model remains consistent with stringent constraints from τ→μμμ decays and B(s)-B¯(s) mixing.

Conclusions:

  • A single, well-motivated theoretical model can resolve multiple discrepancies between the Standard Model and LHC observations.
  • The findings suggest potential new physics beyond the Standard Model and highlight interesting correlations among various observables that can be tested in future experiments.