An exploratory lattice study of spectator effects in inclusive decays of the Λb baryon

A possible explanation of the apparent discrepancy between the theoretical prediction and experimental measurement of the ratio of lifetimes τ(Λb)/τ(Bd) is that “spectator effects”, which appear at O(1/mb3) 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 discrepancy. 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.