Branching fractions, polarisation and asymmetries of B -> VV decays

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dc.creatorBeneke, Martin
dc.creatorRohrer, Johannes
dc.creatorYang, Deshan
dc.date2006-12-21
dc.date2007-05-30
dc.date.accessioned2026-07-07T11:22:23Z
dc.date.available2026-07-07T11:22:23Z
dc.descriptionWe calculate the hard-scattering kernels relevant to the negative-helicity decay amplitude in B decays to two vector mesons in the framework of QCD factorisation. We then perform a comprehensive analysis of the 34 B->VV decays, including B_s decays and the complete set of polarisation observables. We find considerable uncertainties from weak annihilation and the non-factorisation of spectator-scattering. Large longitudinal polarisation is expected with certainty only for a few tree-dominated colour-allowed modes, which receive small penguin and spectator-scattering contributions. This allows for an accurate determination of the CKM angle alpha (or gamma) from S_L(rhorho) resulting in alpha=(85.6^{+7.4}_{-7.3}) degrees. We also emphasize that the rho K* system is ideal for an investigation of electroweak penguin effects.
dc.description39 pages, v2: matches published version
dc.identifierhttps://arxiv.org/abs/hep-ph/0612290
dc.identifierhttp://arxiv.org/abs/hep-ph/0612290
dc.identifierNucl.Phys.B774:64-101,2007
dc.identifierdoi:10.1016/j.nuclphysb.2007.03.020
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/194553
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.titleBranching fractions, polarisation and asymmetries of B -> VV decays
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