Implications of the Anomalies in B_s^0-\bar{B}_s^0 Mixing for Anomalous Tensor Couplings

TL;DR

This paper investigates how anomalous tensor couplings could explain recent anomalies in B_s^0-ar{B}_s^0 mixing and CP violation, constraining parameter spaces with experimental data.

Contribution

It introduces a detailed analysis of tensor operator contributions to B_s mixing anomalies, providing specific parameter constraints and potential solutions.

Findings

Tensor operators can moderate B_s mixing anomalies.

Specific weak phases and coupling strengths are identified.

Constraints from experimental observables are incorporated.

Abstract

Motivated by the recently observed anomalous large dimuon charge asymmetry in neutral B decays and the unexpected large CP phase in the mixing-induced CP asymmetry for B_s-->J/\psi\phi decay, we study the effects of the anomalous tensor couplings to pursue possible solution. With the constraints from the obsevables \phi^{J/\psi\phi}_s, a_{sl}^s and \Delta M_s, the parameter spaces are severely restricted. Numerically, we find the anomalies in B_s^0-\bar{B}_s^0 mixing system could be moderated simultaneously by the contributions induced by the color-singlet or color-octet tensor operators with their respective nontrivial new weak phase \phi_{T1}\approx28.0(15.6) degree or \phi_{T8}\approx-62.1(-74.2) degree and relevant strength parameters g_{T1}\approx6.7(8.5)\times10^{-2} or g_{T8}\approx1.9(2.4)\times10^{-2} for the CP-violating phase \phi^{J/\psi\phi}_s=-0.77(+0.29,-0.37)(-2.36(+0.37,-0.29)), respectively.