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  • Open Access

B anomalies in a two-Higgs-doublet model with flavor symmetry

Qiaoyi Wen and Fanrong Xu*

  • Department of Physics, College of Physics and Optoelectronic Engineering, Jinan University, Guangzhou 510632, People’s Republic of China

  • *Contact author: fanrongxu@jnu.edu.cn
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Phys. Rev. D 111, 115024 – Published 24 June, 2025

DOI: https://doi.org/10.1103/fsn2-rndj

Abstract

The long-standing flavor anomalies in b→sℓ+ℓ− and b→cℓν persist. In this work, we explore a specific flavor-gauged two-Higgs-doublet model (FG2HDM) extended by a scalar singlet, with an imposed U(1) flavor symmetry. Compared to the standard model (SM), four additional scalars and one neutral gauge boson Z′ are added to the particle spectrum. The special Yukawa coupling matrices, due to the U(1) symmetry, lead to flavor-changing neutral Higgs interactions uniquely occurring in the down-type quark sector, while the new gauge boson Z′ induces flavor-changing neutral current interactions in the down-type quark sector as well. The two distinct types of anomalies can be accommodated simultaneously in such a model. Incorporating scalar and vector contributions to b→sℓ+ℓ−, Bs→μ+μ−, and Bs0−B¯s0 mixing, charged Higgs contributions to b→cℓν, along with electroweak precision observables and Higgs fermionic decays, we investigate the parameter space in FG2HDM and find substantial room in the solution space. Specifically, in the SM-like model setup, the data suggest that mZ′<450  GeV, tanβ<28, and g′/mZ′>3.5×10−4  GeV−1, while there are fewer constraints on heavy scalars, which can be further tested by a combination of other observables.

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Phys. Rev. D 111, 115024– Published 24 June, 2025
  • Received 20 August 2024
  • Accepted 27 May 2025
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