An Exploratory Lattice Study of Spectator Effects in Inclusive Decays of the Lambda_b Baryon

Details An Exploratory Lattice Study of Spectator Effects in Inclusive Decays of the Lambda_b Baryon An Exploratory Lattice Study of Spectator Effects in Inclusive Decays of the Lambda_b Baryon

1999-06-26

arxiv.org/abs/hep-lat/9906031v2

Phys.Lett.B468:143,1999

Physics

High Energy Physics

High Energy Physics - Lattice

12 pages, Latex. One correction: in the original version of the paper, in eqs.10, 11, 12 and 39, the values of the pion masses

Scientific paper

10.1016/S0370-2693(99)01166-1

A possible explanation of the apparent disrepency between the theoretical prediction and experimental measurement of the ratio of lifetimes $\tau(\Lambda_b)/\tau(B_d)$ is that ``spectator effects'', which appear at $O(1/m_b^3)$ in the heavy quark expansion, contribute significantly. We investigate this possibility by computing the corresponding operator matrix elements in a lattice simulation. We find that spectator effects are indeed significant, but do not appear to be sufficiently large to account for the full discrepency. We stress, however, that this is an exploratory study, and it is important to check our conclusions on a larger lattice and using a larger sample of gluon configurations.

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