Polarization, CP Asymmetry and Branching ratios in B \to K^* K^* with Perturbative QCD approach

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dc.creatorZhu, Jin
dc.creatorShen, Yue-Long
dc.creatorLu, Cai-Dian
dc.date2005-04-21
dc.date.accessioned2026-07-07T10:44:17Z
dc.date.available2026-07-07T10:44:17Z
dc.descriptionWe study the charmless rare decays $B \to K^{\ast} K^{\ast}$ within the Perturbative QCD picture. We calculate not only factorizable and non-factorizable diagrams, but also annihilation ones. Our predictions are the following: The longitudinal polarization fraction vary from 75% to 99% depending on channels, the branching ratios are of order $10^{-7}$ for $B^0(\bar{B}^0) \to K^{\ast0}\bar{K}^{\ast0}$ and $B^{\pm} \to K^{\ast\pm} \bar{K}^{\ast0}(K^{\ast0})$, much bigger than that for $B^0(\bar{B}^0) \to K^{\ast+}K^{\ast-}$($10^{-8}$). The direct CP asymmetry in $B^{\pm} \to K^{\ast\pm} \bar{K}^{\ast0}(K^{\ast0})$ and $B^0(\bar{B}^0) \to K^{\ast+}K^{\ast-}$ is about -15% and -65% if we choose $α(ϕ_2)$ as $95^{\circ}$. There's no direct CPV in $B^0(\bar{B}^0) \to K^{\ast0}\bar{K}^{\ast0}$ decays because of the pure $b \to d$ penguin topology. Our predictions will be tested in the future B experiments.
dc.description32 pages, 8 figures
dc.identifierhttps://arxiv.org/abs/hep-ph/0504187
dc.identifierhttp://arxiv.org/abs/hep-ph/0504187
dc.identifierPhys.Rev.D72:054015,2005
dc.identifierdoi:10.1103/PhysRevD.72.054015
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/182543
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.titlePolarization, CP Asymmetry and Branching ratios in B \to K^* K^* with Perturbative QCD approach
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