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- W3098049191 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 (FBA) in the [4, 6] GeV2 and [1, 4] GeV2 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 C10 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 (SM), namely the SM with four generations (SM4), 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." @default.
- W3098049191 created "2020-11-23" @default.
- W3098049191 creator A5026588872 @default.
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- W3098049191 date "2010-11-01" @default.
- W3098049191 modified "2023-09-23" @default.
- W3098049191 title "An improved observable for the forward-backward asymmetry in B → K ∗ℓ+ℓ− and B s → ϕ ℓ+ℓ−" @default.
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- W3098049191 doi "https://doi.org/10.1007/jhep11(2010)121" @default.
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