Spectator Effects in Inclusive Decays of Beauty Hadrons

Abstract

We evaluate the matrix elements of the four-quark operators which contribute to the lifetimes of $B$-mesons and the ${\Lambda }_b$-baryon. We find that the spectator effects are not responsible for the discrepancy between the theoretical prediction and experimental measurement of the ratio of lifetimes $\tau ({\Lambda }_b)/\tau (B)$.

Comments: LATTICE98. 3 pages, no figures