Next-to-Leading Order QCD corrections to the Lifetime Difference of $B_s$ Mesons

TL;DR

This paper calculates the next-to-leading order QCD corrections to the lifetime difference of $B_s$ mesons, revealing a significant decrease from previous estimates and discussing its theoretical and physical implications.

Contribution

It provides the first NLO QCD calculation of the $B_s$ meson lifetime difference, improving accuracy over previous LO estimates.

Findings

NLO corrections reduce the estimated lifetime difference.

The result depends on bag parameters $B$ and $B_S$ in the NDR scheme.

The paper discusses the implications of the corrected lifetime difference.

Abstract

In this talk we present a calculation of the dacay rate difference in the neutral $B_s-\bar{B}_s$ system, $\Delta \Gamma_{B_s}$, in next-to-leading order (NLO) QCD. We find a sizeable decrease compared to leading-order (LO) estimates: $ (\Delta \Gamma/\Gamma)_{B_s} = (f_{B_s}/210 MeV)^2 [0.006 B(m_b) + 0.150 B_S(m_b) - 0.0063]$ in terms of the bag parameters $B$ and $B_S$ in the NDR scheme. We put special emphasize on the theoretical and physical implications of this quantity.