Semileptonic width ratios among beauty hadrons
High Energy Physics - Phenomenology
2015-05-28 v1
Abstract
We present predictions based on the heavy quark expansion in QCD. We find SU(3) breaking in B mesons suppressed in the framework of the HQE. B_s is expected to have the semileptonic width about 1% lower and Lambda_b about 3% higher when compared to Gamma_{sl}(B_d). The largest partial-rate preasymptotic effect is Pauli interference in the b-->u ell nu channel in Lambda_b, about +10%. We point out that the Omega_b semileptonic width is expected not to exceed that of B_d and may turn out to be the smallest among stable b hadrons despite the large mass. The underlying differences with phase-space models are briefly addressed through the heavy mass expansion.
Cite
@article{arxiv.1105.4574,
title = {Semileptonic width ratios among beauty hadrons},
author = {I. I. Bigi and Th. Mannel and N. Uraltsev},
journal= {arXiv preprint arXiv:1105.4574},
year = {2015}
}
Comments
19 pages