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Three-body decays B→?(ρ)Kγ in perturbative QCD approach

机译:扰动QCD方法中的三体衰变B→?(ρ)Kγ

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We study the three-body radiative decays B → ? ( ρ ) K γ induced by a flavor-changing neutral current in the perturbative QCD approach. Pseudoscalar-vector ( P V ) distribution amplitudes (DAs) are introduced for the final-state ? K ( ρ K ) pair to capture important infrared dynamics in the region with a small P V -pair invariant mass. The dependence of these P V DAs on the parton momentum fraction is parametrized in terms of the Gegenbauer polynomials, and the dependence on the meson momentum fraction is derived through their normalizations to timelike P V form factors. In addition to the dominant electromagnetic penguin, the subleading chromomagnetic penguin, quark-loop and annihilation diagrams are also calculated. After determining the P V DAs from relevant branching-ratio data, the direct C P asymmetries and decay spectra in the P V -pair invariant mass are predicted for each B → ? ( ρ ) K γ mode.
机译:我们研究三体辐射衰减B→?在扰动QCD方法中,由变味中性电流引起的(ρ)Kγ。对于最终状态α,引入了伪标量向量(PV)分布幅度(DAs)。 K(ρK)对捕获具有较小P V对不变质量的区域中的重要红外动力学。这些P V DA对Parton动量分数的依赖性是根据Gegenbauer多项式参数化的,而对介子动量分数的依赖性是通过将它们归一化为类似时间的P V形状因子而得出的。除了占主导地位的电磁企鹅外,还计算了次主导的变色企鹅,夸克环和an灭图。在根据相关的分支比数据确定了P V DA之后,对每个B→?预测P V对不变质量中的直接C P不对称性和衰减谱。 (ρ)Kγ模式。

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