Lepton polarization asymmetry in $B_(s,d)^*$ arrow ${\mu}^+ {\mu}^-$ with new Z' couplings

TL;DR

This paper investigates how a non-universal Z' boson influences the lepton polarization asymmetry in rare B* meson decays to muon pairs, providing potential signals of new physics beyond the Standard Model.

Contribution

It introduces a model with non-universal Z' couplings affecting B* meson decays and constrains parameters using mixing data to predict observable asymmetry deviations.

Findings

Lepton polarization asymmetry deviates from SM predictions due to Z' effects.

Model parameters constrained by B_s-d mixing data.

Potential for new physics signals in rare B* decay measurements.

Abstract

We study the effect of non-universal $Z'$ boson on the rare leptonic decay modes of $B_s^*$ mesons, mediated by $b arrow sll$ quark transition. Rare B decays are sensitive to various new physics operators. As B mesons are composite particles, such decay modes of the excited states are ideal for probing new physics beyond the standard model. We have constrained our model parameters from $B_(s,d)-$ {B bar(s,d)}$ mixing data to predict the lepton polarization asymmetry of $B_(s,d)^*$ arrow ${\mu}^+ {\mu}^-$ channel. It is found that this asymmetry deviates from its SM prediction along with the $Z'$effect