An improved observable for the forward-backward asymmetry in B -> K* l+ l- and Bs -> phi l+ l-

Abstract

We study the decay B -> K* l+ l- in the QCD factorization approach and propose a new integrated observable whose dependence on the form factors is almost negligible, consequently the non--perturbative error is significantly reduced and indeed its overall theoretical error is dominated by perturbative scale uncertainties. The new observable we propose is the ratio between the integrated forward--backward asymmetry in the [4,6] GeV^2 and [1,4] GeV^2 dilepton invariant mass bins. This new observable is particularly interesting because, when compared to the location of the zero of the FBA spectrum, it is experimentally easier to measure and its theoretical uncertainties are almost as small; moreover it displays a very strong dependence on the phase of the Wilson coefficient C_10 that is otherwise only accessible through complicated CP violating asymmetries. We illustrate the new physics sensitivity of this observable within the context of few extensions of the Standard Model, namely the SM with four generations, an MSSM with non--vanishing source of flavor changing neutral currents in the down squark sector and a Z' model with tree level flavor changing couplings.

19 pages, 7 figures

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Cited by in corpus (13)

• Complete Anatomy of B -> K*ll and its angular distribution
• General Analysis of B -> K^(*) l^+ l^- Decays at Low Recoil
• Model-independent constraints on new physics in b --> s transitions
• New Physics in b -> s mu+ mu-: CP-Conserving Observables
• Exploring New Physics in the C7-C7' plane
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• Study of Bs-> ϕl^+ l^-$ Decay in a Single Universal Extra Dimension
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