Second order direct CP asymmetry in B_(s) -> X l nu
High Energy Physics - Phenomenology
2011-04-28 v3 High Energy Physics - Experiment
Abstract
A direct CP asymmetry in inclusive semileptonic B_(s) decays vanishes by CPT to lowest order in weak interactions. Calculating the asymmetry at second order weak interactions in the Cabibbo-Kobayashi-Maskawa framework we find A_{sl} = (-3.2 \pm 0.9) x 10^{-9}. A maximal asymmetry which is two orders of magnitude larger is estimated in a left-right symmetric model. This quite generic upper bound implies negligible effects on wrong-sign lepton asymmetries in B^0 and B_s decays.
Keywords
Cite
@article{arxiv.1008.4354,
title = {Second order direct CP asymmetry in B_(s) -> X l nu},
author = {Shaouly Bar-Shalom and Gad Eilam and Michael Gronau and Jonathan L. Rosner},
journal= {arXiv preprint arXiv:1008.4354},
year = {2011}
}
Comments
13 pages, 3 figures. A few changes and new references, separate section on decays to wrong-sign leptons; some clarifications