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

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

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Abstract

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.

Item Type:	Article
Additional Information:	LTH 460. arXiv Number: arXiv:hep-lat/9906031v2. Available online 7 January 2000. Issue: 25 November 1999.
Uncontrolled Keywords:	5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 4902 Mathematical Physics, 49 Mathematical Sciences, 51 Physical Sciences
Subjects:	?? QC ??
Divisions:	Faculty of Science & Engineering > School of Physical Sciences > Mathematical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	27 Nov 2008 12:59
Last Modified:	22 May 2026 23:18
DOI:	10.1016/s0370-2693(99)01166-1
Related Websites:	Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/612
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