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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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Official URL: http://www.elsevier.com/wps/find/journaldescriptio...

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
Additional Information:LTH 460. arXiv Number: arXiv:hep-lat/9906031v2. Available online 7 January 2000. Issue: 25 November 1999.
Uncontrolled Keywords:QCD; LIFETIME; SPECTRUM; BEAUTY
Subjects:Q Science > QC Physics
Departments, Research Centres and Related Units:Academic Faculties, Institutes and Research Centres > Faculty of Science > Department of Mathematical Sciences
DOI:10.1016/S0370-2693(99)01166-1
Related URLs:
Refereed:No
Status:Published
ID Code:612
Deposited On:27 Nov 2008 12:59
Last Modified:28 Feb 2012 10:57

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