The effect of z^prime boson on same-sign dimuon charge asymmetry in $ b_q^0 - bar b_q^0$ system

TL;DR

This paper investigates how a Z'-mediated flavor-changing neutral current could explain the observed anomaly in same-sign dimuon charge asymmetry in B meson systems, suggesting potential new physics beyond the Standard Model.

Contribution

It introduces a model considering Z'-mediated FCNC effects on B meson mixing to account for the dimuon asymmetry anomaly.

Findings

Z'-mediated FCNC enhances the asymmetry beyond SM predictions

The model can reconcile the D0 and LHCb results

Provides signals for new physics beyond the Standard Model

Abstract

The recent observation of the same-sign dimuon charge asymmetry in the B system by the D0 collaboration has 3.9 sigma deviation from the standard model prediction. However, the recent LHCb data on B-s neutral-meson mixing do not accommodate the D0 collaboration result. In this paper, considering the effect of Z'-mediated flavour-changing neutral currents in the $ B_q^0 - bar B_q^0$ (q = d, s) mixing, the same-sign dimuon charge asymmetry is calculated. We find the same-sign dimuon charge asymmetry is enhanced from its SM prediction and provides signals for new physics beyond the SM