论文标题
在偶极子图片中以近代领先的顺序排列的光矢量介子的独家生产
Exclusive production of light vector mesons at next-to-leading order in the dipole picture
论文作者
论文摘要
深度非弹性散射中光矢量介子的独家产生在高光子虚拟度极限的近代领顺序中计算出来。所得的表达不含任何差异，适合数值评估。发现高阶校正在数值上很重要，但是可以通过非扰动拟合参数来捕获它们，该参数描述了偶极散射幅度的小$ x $演变的初始条件。向量介子生产横截面显示仅弱取决于介子分布幅度和分解量表。我们还将结果的现象学比较与HERA的现有独家$ ϕ $和$ρ$生产数据进行了比较，并在高虚拟上找到了一项出色的协议。
Exclusive production of light vector mesons in deep inelastic scattering is calculated at next-to-leading order in the dipole picture in the limit of high photon virtuality. The resulting expression is free of any divergences and suitable for numerical evaluations. The higher-order corrections are found to be numerically important, but they can be mostly captured by the nonperturbative fit parameters describing the initial condition for the small-$x$ evolution of the dipole scattering amplitude. The vector meson production cross section is shown to depend only weakly on the meson distribution amplitude and the factorization scale. We also present phenomenological comparisons of our result to the existing exclusive $ϕ$ and $ρ$ production data from HERA and find an excellent agreement at high virtualities.
