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Area of Science:

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

Background:

  • Experimental anomalies in B→Dτν and B→D^{*}τν decays (BABAR, Belle, LHCb) suggest new physics.
  • Discrepancies in the muon anomalous magnetic moment and τ→μνν branching ratio persist.
  • Hints of a non-zero decay rate for h→μτ observed by CMS.

Purpose of the Study:

  • To investigate if a lepton-specific two-Higgs doublet model (Type X) with nonstandard Yukawa couplings can explain observed experimental anomalies.
  • To explore the role of new scalar particles in reconciling discrepancies in B-meson decays, muon magnetic moment, and tau lepton decays.

Main Methods:

  • Theoretical analysis within a two-Higgs doublet model framework.
  • Inclusion of nonstandard Yukawa couplings to accommodate experimental data.
  • Calculation of decay rates and particle properties within the proposed model.

Main Results:

  • The model successfully accommodates the τ→μνν anomaly via modified Higgs-tau couplings.
  • A light additional neutral CP-even Higgs boson (H < 100 GeV) explains the muon anomalous magnetic moment.
  • Anomalies in R(D) and R(D*) are explained by additional top-charm (t-c) Higgs couplings.
  • The decay rate for t→Hc is predicted to be testable at the LHC.

Conclusions:

  • The considered two-Higgs doublet model provides a consistent framework for explaining multiple experimental anomalies.
  • The existence of new scalar particles, particularly a light neutral Higgs boson, is strongly suggested.
  • Further experimental verification at the LHC is crucial for confirming these findings.