Speaker
Description
The current experimental data on several observables in $b \to (s,d)\,\mu^+\mu^-$ transitions exhibit persistent deviations from Standard Model (SM) predictions. Motivated by the possibility that these anomalies originate from physics beyond the SM, we investigate a scenario in which a non-universal $Z^{\prime}$ boson provides the underlying new physics contribution. We consider a $U(1)_{B-3L_\mu}$ gauge extension of the Standard Model, which naturally induces additional interactions in the muon sector through generation-dependent gauge charges. Consequently, the associated $Z^{\prime}$ boson couples preferentially to muons providing a natural framework to address the observed deviations in muon-specific flavor observables. Additionally, the flavor-dependent couplings of the $Z^{\prime}$ to quarks can simultaneously affect non-leptonic observables, particularly the $L_{K^{*}\bar{K}^{*}}$ puzzle associated with rare $B_{s(d)} \to K^{*}K^{*}$ decays. Incorporating constraints from current measurements of $b \to (s,d)\mu^+\mu^-$ processes, we examine the implications of the $Z^{\prime}$ model for this non-leptonic observable and assess its potential to reconcile the existing tensions with experimental data.
| Discipline | Theory |
|---|---|
| Topic | Heavy Quark Decays |