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arXiv 1902.09056hep-ph
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非相对论QCD框架下$ep$碰撞中光生$η_c$的运动学分布

Kinematic distributions of the $η_c$ photoproduction in $ep$ collisions within the nonrelativistic QCD framework

Hong-Fei Zhang, Yu Feng, Wen-Long Sang, Yu-Peng Yan

摘要:

本文研究了$ep$碰撞中的光生$η_c$。在$α_s$展开式中,首次实现了对$c\bar{c}(^1S_0^{[1]})$、$c\bar{c}(^1S_0^{[8]})$、$c\bar{c}(^3S_1^{[8]})$和$c\bar{c}(^1P_1^{[8]})$光生产物的短程系数的估计。我们仔细分析了截面的不同运动学分布,发现与色八重态部分相比,色单重态部分的贡献被大大抑制。这一特性使$η_c$光生过程成为检验非相对论QCD中色八重态机制的理想实验室。通过采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,这些预测可以用来仔细检查这些矩阵元素的有效性。

英文摘要:

We study the $η_c$ photoproduction in $ep$ collisions in this paper. The short-distance coefficients for $c\bar{c}(^1S_0^{[1]})$, $c\bar{c}(^1S_0^{[8]})$, $c\bar{c}(^3S_1^{[8]})$, and $c\bar{c}(^1P_1^{[8]})$ photoproductions are evaluated at leading order in $α_s$ expansion, where the color-singlet contribution is achieved for the first time. We have carefully analyzed different kinematic distributions of the cross sections and found that the color-singlet contribution is considerably suppressed comparing with the color-octet parts. This feature renders the $η_c$ photoproduction process an ideal laboratory to test the color-octet mechanism in nonrelativistic QCD. By taking different sets of long-distance matrix elements, we have observed some apparently distinguishable predictions, which can be utilized to scrutinize the validity of these matrix elements.

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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