具有大不变质量和横向广义部分子分布的π rhoT对的光生
Photoproduction of a pi rhoT pair with a large invariant mass and transversity generalized parton distribution
摘要：
核子的手征奇横向广义部分子分布（GPD）可以通过光生过程gamma + N -> pi + rho + N '在运动学中得到，其中介子对具有大的不变质量，末态核子具有小的横向动量，只要矢量介子产生于横向极化态.我们用微扰法计算了首阶的散射振幅。基于双分布的概念，建立了显性横向GPD H_T（x，xi，t）的简单模型。我们估计的非极化微分截面为这个过程中的运动学的Jlab和COMPASS实验。计数率表明，实验看起来可行的真实光子束的特性预期在JLab@12 GeV，并与准真实光子束在COMPASS实验。
英文摘要：
The chiral-odd transversity generalized parton distributions (GPDs) of the nucleon can be accessed experimentally through the exclusive photoproduction process gamma + N -> pi + rho + N', in the kinematics where the meson pair has a large invariant mass and the final nucleon has a small transverse momentum, provided the vector meson is produced in a transversally polarized state. We calculate perturbatively the scattering amplitude at leading order in alpha_s. We build a simple model for the dominant transversity GPD H_T(x,xi, t) based on the concept of double distribution. We estimate the unpolarized differential cross section for this process in the kinematics of the Jlab and COMPASS experiments. Counting rates show that the experiment looks feasible with the real photon beam characteristics expected at JLab@12 GeV, and with the quasi real photon beam in the COMPASS experiment.
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