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- W2035248045 abstract "The 2.5 sigma discrepancy between theory and experiment observed in the difference A_CP(B^- --> pi^0 K^-)-A_CP(Bbar^0 --> pi^+ K^-) can be explained by a new electroweak penguin amplitude. Motivated by this result, we analyse the purely isospin-violating decays B_s --> phi rho^0 and B_s --> phi pi^0, which are dominated by electroweak penguins, and show that in presence of a new electroweak penguin amplitude their branching ratio can be enhanced by up to an order of magnitude, without violating any constraints from other hadronic B decays. This makes them very interesting modes for LHCb and future B factories. We perform both a model-independent analysis and a study within realistic New Physics models such as a modified-Z^0-penguin scenario, a model with an additional Z' boson and the MSSM. In the latter cases the new amplitude can be correlated with other flavour phenomena, such as semileptonic B decays and B_s-Bbar_s mixing, which impose stringent constraints on the enhancement of the two B_s decays. In particular we find that, contrary to claims in the literature, electroweak penguins in the MSSM can reduce the discrepancy in the B --> pi K modes only marginally. As byproducts we update the SM predictions to Br(Bbar_s --> phi pi^0)=1.6^{+1.1}_{-0.3}*10^{-7} and Br(Bbar_s --> phi rho^0)=4.4^{+2.7}_{-0.7}*10^{-7} and perform a state-of-the-art analysis of B --> pi K amplitudes in QCD factorisation." @default.
- W2035248045 created "2016-06-24" @default.
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- W2035248045 date "2011-02-01" @default.
- W2035248045 modified "2023-10-14" @default.
- W2035248045 title "$ {bar{B}_s} to phi {rho^0} $ and $ {bar{B}_s} to phi {pi^0} $ as a handle on isospin-violating New Physics" @default.
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- W2035248045 doi "https://doi.org/10.1007/jhep02(2011)080" @default.
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