Lifetimes of heavy hadrons beyond leading logarithms

Abstract

The lifetime splitting between the B^+ and B_d^0 mesons has recently been calculated in the next-to-leading order of QCD. These corrections are necessary for a reliable theoretical prediction, in particular for the meaningful use of hadronic matrix elements computed with lattice QCD. Using results from quenched lattice QCD we find tau(B^+)/tau(B^0_d)=1.053 +/- 0.016 +/- 0.017, where the uncertainties from unquenching and 1/m_b corrections are not included. The lifetime difference of heavy baryons Xi_b^0 and \Xi_b^- is also discussed.

Comments: 10 pages, 4 figures, Talk at Continuous Advances in QCD 2002/ ARKADYFEST,17-23 May 2002, Minneapolis, Minnesota, USA