Squark flavor mixing and CP asymmetry of neutral $B$ mesons at LHCb

TL;DR

This paper investigates how squark flavor mixing could influence CP violation in neutral B mesons, analyzing experimental data and predicting asymmetries in specific decay channels to explore potential new physics beyond the Standard Model.

Contribution

It introduces a detailed analysis of squark flavor mixing effects on CP violation in B mesons, providing predictions for asymmetries in various decay modes based on recent experimental constraints.

Findings

Squark flavor mixing can significantly affect CP asymmetries in B meson decays.

Predicted asymmetries in certain decay channels could signal new physics beyond the Standard Model.

Analysis aligns with current experimental data while leaving room for new physics contributions.

Abstract

The CP violation of the neutral $B$ meson is the important phenomenon to search for the new physics. The like-sign dimuon charge asymmetry observed by the D$\O$ Collaboration indicates the CP-violating new physics in the $B_s-\bar B_s$ mixing. On the other hand, LHCb observed the CP-violating asymmetry in $B_s^0\to J/\psi \phi$ and $B_s^0\to J/\psi f_0(980)$, which is consistent with the SM prediction. However, there is still room for new physics of the CP violation. The CKMfitter has presented the allowed region of the new physics parameters taking account of the LHCb data. Based on these results, we discuss the effect of the squark flavor mixing on the CP violation in the $B_d$ and $B_s$ mesons. We predict asymmetries in the non-leptonic decays $B_d^0\to \phi K_S$, $B_d^0\to \eta 'K^0$, $B_s^0\to \phi \phi$ and $B_s^0\to \phi \eta '$.