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Penguin-mediated B_(d,s)->VV decays and the Bs - anti-Bs mixing angle

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arxiv 0705.0477 v3 pith:I3VYFATY submitted 2007-05-03 hep-ph

Penguin-mediated B_(d,s)->VV decays and the Bs - anti-Bs mixing angle

Sebastien Descotes-Genon (Orsay , LPT) , Joaquim Matias (Barcelona , IFAE) , Javier Virto (Barcelona This is my paper
classification hep-ph
keywords angledecaysmixingpenguin-mediatedanti-bsbranchingcombinescounterpart
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In this letter, we propose three different strategies to extract the weak mixing angle phi_s of the Bs system using penguin-mediated decays into vectors, mainly Bs->K*K*, Bs->phi K* and Bs->phi phi. We also provide predictions for the longitudinal branching ratio and CP-asymmetries of Bs->K*K* using a method that combines QCD factorisation with flavour symmetries to relate this decay to its Bd counterpart.

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  1. Measurement of the branching fractions and longitudinal polarisations of $B^0_{(s)} \to K^{*0} \kern 0.18em \overline{\kern -0.18em K}{}^{*0}$ decays

    hep-ex 2025-12 accept novelty 4.0

    LHCb measures f_L^d = 0.600 and f_L^s = 0.159 for B to K* Kbar* decays and reports a ratio L of 4.92 that confirms 4.4 sigma discrepancy with theory.