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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2007.05547hep-ph
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NRQCD中的夸克偶素TMD碎裂函数

Quarkonium TMD fragmentation functions in NRQCD

Miguel G. Echevarria, Yiannis Makris, Ignazio Scimemi

摘要:

研究了单轻部分子碎裂机制产生夸克偶素的横动量谱。在半包容深度非弹性散射的情况下,我们观察到有两种可能的初始过程,即光子-胶子融合和轻夸克碎裂。对于第二种情况,我们推导出因子分解定理,它涉及到一个新的强子量:夸克偶素横动量相关的碎裂函数在NRQCD。我们计算了它们在强耦合常数(${\mathcal O}(α_s^2)$)的最低阶上与非微扰长距离矩阵元的匹配。以电子-离子对撞机为例,对两种产生机制进行了比较唯象研究,找到了一种产生机制占优势的相空间区域。

英文摘要:

We study the transverse-momentum spectrum of quarkonium production from single light-parton fragmentation mechanism. In the case of semi-inclusive deep inelastic scattering, we observe that there are two possible initiating processes, namely photon-gluon fusion and light-quark fragmentation. For the second case we derive the factorization theorem, which involves a new hadronic quantity: the quarkonium transverse-momentum-dependent fragmentation functions in NRQCD. We calculate their matching onto the non-perturbative long distance matrix elements at the lowest order in the strong-coupling constant (${\mathcal O}(α_s^2)$). Focusing on the case of the electron-ion collider, we make a comparative phenomenological study of the two production mechanisms and find the regions of the phase space where one is dominant over the other.

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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