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

Di Pierro, Massimo; Sachrajda, Chris T. and Michael, Chris (1999) An exploratory lattice study of spectator effects in inclusive decays of the Lambda_b baryon. Physics Letters B, 468 (1-2). pp. 143-149. ISSN 0370-2693

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## Abstract

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.

Item Type: Article LTH 460. arXiv Number: arXiv:hep-lat/9906031v2. Available online 7 January 2000. Issue: 25 November 1999. QCD; LIFETIME; SPECTRUM; BEAUTY Q Science > QC Physics Academic Faculties, Institutes and Research Centres > Faculty of Science > Department of Mathematical Sciences 10.1016/S0370-2693(99)01166-1 http://arxiv.org/abs/hep-lat/9906031 No Published 612 27 Nov 2008 12:59 28 Feb 2012 10:57

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