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arXiv 0912.0029hep-ph
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非定域手征夸克模型中的光子分布振幅

Photon Distribution Amplitudes in nonlocal chiral quark model

Piotr Kotko, Michal Praszalowicz

摘要:

在非定域手征夸克模型中,采用简单的极近似,计算了组成夸克质量与动量的关系,计算了光子分布振幅。为了满足沃德恒等式,使用修正的电磁矢量电流进行计算。夸克凝聚和磁化率的QCD真空进入的分布振幅的定义进行了计算,并与现有的唯象估计。考虑了真实光子和离壳光子,并计算了相关的形状因子。我们的结果是解析的,直到某些代数方程的数值解。

英文摘要:

Photon distribution amplitudes up to twist four are calculated within the nonlocal chiral quark model with a simple pole ansatz for momentum dependence of the constituent quark mass. Calculations are performed using modified electromagnetic vector current in order to satisfy Ward identities. Quark condensate and magnetic susceptibility of the QCD vacuum entering definitions of the distribution amplitudes are computed and compared with existing phenomenological estimates. Both real and off-shell photons are considered and relevant form factors are calculated. Our results are analytical up to the numerical solution of certain algebraic equation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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