Lifetime difference in B_s mixing: Standard Model and beyond

TL;DR

This paper calculates higher-order corrections to the lifetime differences of B_s mesons within the Standard Model and explores potential impacts of new physics contributions on these differences.

Contribution

It provides the first detailed calculation of $1/m_b^2$ corrections and analyzes how generic $ riangle B=1$ New Physics can influence B_s lifetime differences.

Findings

$1/m_b^2$ corrections are small but significant for $ riangle au_{B_s}$

Non-perturbative corrections are included in the analysis

Examples of new physics effects on B_s lifetime differences are provided

Abstract

We present a calculation of $1/m_b^2$ corrections to the lifetime differences of $B_s$ mesons in the heavy-quark expansion. We find that they are small to significantly affect $\Delta\Gamma$ $(B_s)$ and present the result for lifetime difference including non-perturbative $1/m_b$ and $1/m_b^2$ corrections. We also analyze the generic $\Delta B$ = 1 New Physics contributions to the lifetime difference of $B_s$ mesons and provide several examples