Signature of (axial)vector operators in $B_c\to D_s^{(*)} \mu^+ \mu^-$ decays

TL;DR

This paper investigates potential new physics in $B_c o D_s^{(*)} \mu^+\mu^-$ decays by analyzing experimental data, computing observables, and exploring lepton flavor universality violation within an effective field theory framework.

Contribution

It provides a global fit to (axial)vector couplings using current data and analyzes observables for $B_c o D_s^{(*)} \mu^+\mu^-$ decays in both Standard Model and new physics scenarios.

Findings

Constraints on (axial)vector couplings from data

Predictions for branching ratios and asymmetries

Evidence for or against lepton flavor universality violation

Abstract

The persistent anomalies observed in $B$ mesons related to $b \to s \mu^+ \mu^-$ transitions point to the potential for new physics beyond the Standard Model. To explore this further, we conduct an analysis of the exclusive semileptonic decays $B_c\to D_s^{(*)} \mu^+ \mu^-$ within an effective field theory formalism. We perform a global fit to new (axial)vector couplings using the current experimental data for $b \to s \mu^+ \mu^-$ transitions. We compute the branching ratios and physical observables such as forward-backward asymmetries, lepton polarization asymmetries, form factor independent observables for $B_c\to D_s^{(*)} \mu^+ \mu^-$, both within the Standard Model and in new physics scenarios. Additionally, we examine the existence of lepton flavor universality violation in the $B_c\to D_s^{(*)} \ell^+ \ell^-$ process.