标题： 探究在超越领先阶的深虚介子产生中的胶子饱和性 显示英文标题

标题： Probing gluonic saturation in deeply virtual meson production beyond leading power

摘要： 独家衍射介子产生代表了一个黄金通道，用于研究核子和原子核内的胶子饱和。 在本信中，我们建立了一个系统框架，以处理小-$x$范围内的超越领先幂次修正，包括饱和区域，并获得了$\gamma^{*} \rightarrow M (\rho, \phi, \omega)$的影响因子，其中入射光子和出射介子都具有任意极化。 这特别有意义，因为现代对撞机上的饱和尺度虽然进入微扰区域，但还不够大，无法防止高扭效应变得显著。 显示英文摘要

摘要： Exclusive diffractive meson production represents a golden channel for investigating gluonic saturation inside nucleons and nuclei. In this letter, we settle a systematic framework to deal with beyond leading power corrections at small-$x$, including the saturation regime, and obtain the $\gamma^{*} \rightarrow M (\rho, \phi, \omega)$ impact factor with both incoming photon and outgoing meson carrying arbitrary polarizations. This is of particular interest since the saturation scale at modern colliders, although entering a perturbative regime, is not large enough to prevents higher-twist effects to be sizable.