An Exploratory Lattice Study of Spectator Effects in Inclusive Decays of the Lambda_b Baryon

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dc.creatorDi Pierro, Massimo
dc.creatorSachrajda, Chris T
dc.creatorMichael, Chris
dc.date1999-06-26
dc.date2001-12-07
dc.date.accessioned2026-07-07T11:47:21Z
dc.date.available2026-07-07T11:47:21Z
dc.descriptionA possible explanation of the apparent disrepency between the theoretical prediction and experimental measurement of the ratio of lifetimes $τ(Λ_b)/τ(B_d)$ 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.
dc.description12 pages, Latex. One correction: in the original version of the paper, in eqs.10, 11, 12 and 39, the values of the pion masses appeared interchanged
dc.identifierhttps://arxiv.org/abs/hep-lat/9906031
dc.identifierhttp://arxiv.org/abs/hep-lat/9906031
dc.identifierPhys.Lett.B468:143,1999
dc.identifierdoi:10.1016/S0370-2693(99)01166-1
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/202547
dc.subjectHigh Energy Physics - Lattice
dc.titleAn Exploratory Lattice Study of Spectator Effects in Inclusive Decays of the Lambda_b Baryon
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