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首页> 外文期刊>Physical review, D >Kinematic distributions of the ηc photoproduction in ep collisions within the nonrelativistic QCD framework
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Kinematic distributions of the ηc photoproduction in ep collisions within the nonrelativistic QCD framework

机译：非相对论性QCD框架内ep碰撞中ηc光产生的运动学分布

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We study the η c photoproduction in e p collisions in this paper. The short-distance coefficients for c c ˉ ( S 0 [ 1 ] 1 ) , c c ˉ ( S 0 [ 8 ] 1 ) , c c ˉ ( S 1 [ 8 ] 3 ) , and c c ˉ ( P 1 [ 8 ] 1 ) photoproductions via both direct and resolved photons are evaluated at leading order in α s expansion, where the color-singlet contribution is achieved for the first time. The dependence of the cross sections on the renormalization and factorization scales, and the charm quark mass is studied in this paper. As an interesting result, the color-singlet cross section is dominated by the resolved photoproduction, which is almost two orders of magnitude larger than the contributions from the direct photons. The resolved photoproduction also enhances the color-octet cross sections considerably. By including the contributions from direct and resolved photons, we find the color-singlet channel dominates the integrated cross section. Making use of different sets of long-distance matrix elements, we observe some apparently distinguishable predictions, which can be utilized to scrutinize the validity of these matrix elements. Moreover, we carefully analyze different kinematic distributions of the cross sections and find that, in high p t regions, the color-singlet contribution is considerably suppressed comparing with the color-octet parts for most sets of long-distance matrix elements. This feature renders the η c photoproduction process another laboratory to test the color-octet mechanism in nonrelativistic QCD.
机译：我们研究了e p碰撞中的ηc光产生。 ccˉ（S 0 [1] 1），ccˉ（S 0 [8] 1），ccˉ（S 1 [8] 3）和ccˉ（P 1 [8] 1）的短距离系数在αs扩展中，以先导顺序评估通过直接光子和通过分辨光子产生的光产生，这是首次实现彩色-单色贡献。本文研究了截面对重整化和因式分解尺度的依赖性以及魅力夸克质量。有趣的结果是，彩色-单一横截面由分辨的光产生决定，该光产生比直接光子的贡献大将近两个数量级。已解决的照片制作效果也大大增强了彩色八角形的横截面。通过包括来自直接光子和已分解光子的贡献，我们发现彩色单通道主导了积分截面。利用不同的长距离矩阵元素集，我们观察到一些明显可区分的预测，这些预测可以用来检查这些矩阵元素的有效性。此外，我们仔细分析了横截面的不同运动学分布，发现对于大多数长距离矩阵元素集，在高p t区域中，与色彩八位字节相比，色彩单峰的贡献得到了显着抑制。此功能使ηc照相制版过程成为另一个实验室，用于测试非相对论QCD中的色八位字节机制。

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