17 research outputs found
Width difference in the - system with lattice NRQCD
We compute the matrix element of the four-quark operator \Op_S =
in the mixing on
the lattice using NRQCD, which gives a leading contribution in the calculation
of the width difference in the expansion. Using the
next-to-leading formula of Beneke \textit{et al.}, we obtain
= 0.151(37)(36)(17), where the the first error
reflects the uncertainty of = 245(30) MeV, the second error comes
from our calculation of the matrix element of \Op_S, and the third represents
unknown correction.Comment: 17 pages, 6 figures, uses REVTeX, corrected typos, conservative
systematic erro