Ulrik Egede, Tobias Hurth, Joaquim Matias, Marc Ramon, Will Reece
Published 2010-12-21Version 1
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.
Comments: Based on talks given at CKM2010, the 6th International Workshop on the CKM Unitarity Triangle, University of Warwick, UK, 6-10 September 2010 and ICHEP2010, 35th International Conference on High Energy Physics ICHEP2010, Paris, France, 21-28 July 2010
The Full $B \to D^{*} τ^{-} \bar{ν_τ}$ Angular Distribution and CP violating Triple Products
Angular distribution and rotations of frame in vector meson decays into lepton pairs
Angular distribution of thrust axis with power-suppressed contribution in e+e- annihilation
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