Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-11-23
PoS HEP2005:281,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 4 figures
Scientific paper
We discuss, in detail, the K* polarization states in the exclusive B meson decay B0-> K*0(-> K-pi+)l^+l^- (l=e, \mu, \tau) in the low dilepton mass region. We focus on the study of the angular distribution of this decay that provides valuable information on the K* spin amplitudes A_perp, A_par, A0. This can give us a handle on non-standard interactions that cannot be proved through measurements of the branching ratio and lepton forward-backward asymmetry. We explore the transverse asymmetries A_T^1(s), A_T^2(s), K* polarization parameter \alpha_{K*}(s), the fraction of K* polarization F_L(s) and F_T(s) and the corresponding integrated observables at NLL order, including factorizable and non-factorizable corrections. We find, in particular, that the dependence on hadronic uncertainties for the transverse asymmetries turns out to be very small. This allow us to distinguish which observables are better suited to look for physics beyond the SM. Finally, we study in a model independent way the implications of New Physics for these observables.
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