Symmetries in the angular distribution of exclusive semileptonic B decays

Details Symmetries in the angular distribution of exclusive semileptonic B decays Symmetries in the angular distribution of exclusive semileptonic B decays

2010-12-21

arxiv.org/abs/1012.4603v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Based on talks given at CKM2010, the 6th International Workshop on the CKM Unitarity Triangle, University of Warwick, UK, 6-10

Scientific paper

We discuss a method to construct observables protected against QCD uncertainties based on the angular distribution of the exclusive Bd -> K(*0}(-> Kpi) l+ l- decay. We focus on the identification and the interpretation of all the symmetries of the distribution. They constitute a key ingredient to construct a set of so-called transverse observables. We work in the framework of QCD factorization at NLO supplemented by an estimate of power-suppressed Lambda/mb corrections. A discussion of the new physics properties of two of the transverse asymmetries, AT^{(2)} and AT^{(5)}, is presented. A comparison between the transverse asymmetry AT^{(2)} and the forward-backward asymmetry shows that AT^{(2)} emerges as an improved version of it.

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