Eur. Phys. J. C 21, 313-318 (2001)
DOI: 10.1007/s100520100724

Matrix elements of four-quark operators relevant to life time difference from QCD sum rules

C.-S. Huang¹, Ailin Zhang¹ and S.-L. Zhu<sup>1, 2

1</sup>  Institute of Theoretical Physics, Academia Sinica, P.O. Box 2735, Beijing 100080, P.R. China
²  Department of Physics, University of Connecticut, Storrs, CT 06269, USA

(Received: 23 April 2001 / Revised version: 27 May 2001 / Published online: 19 July 2001 -© Springer-Verlag / Società Italiana di Fisica 2001 )

Abstract
We extract the matrix elements of four-quark operators O_L,S relevant to the B_s and life time difference from QCD sum rules. We find that the vacuum saturation approximation works reasonably well, i.e., within . We discuss the implications of our results and compare them with a recent lattice QCD determination.

© Società Italiana di Fisica, Springer-Verlag 2001