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

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: $(\Delta \Gamma /\Gamma {)}_{B_s}=(f_{B_s}/210MeV{)}^2[0.006B(m_b)+0.150B_S(m_b)-0.0063]$ 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.

Comments: 5 pages, uses JHEP.cls (included), talk given at the Corfu Summer Institute on Elementary Particle Physics (South European School on Elementary Particle Physics), 6-26 September 1998, Kerkyra, Greece (to appear in the proceedings)