Symmetries in the angular distribution of exclusive semileptonic B decays

We discuss a method to construct observables protected against QCD uncertainties based on the angular distribution of the exclusive B-d -> K*(0)(-> K pi)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/m(b) corrections. A discussion of the new physics properties of two of the transverse asymmetries, A(T)((2)) and A(T)((5)), is presented. A comparison between the transverse asymmetry A(T)((2)) and the forward-backward asymmetry shows that A(T)((2)) emerges as an improved version of it.