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

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