论文标题
NRQCD中的Quarkonium TMD片段化功能
Quarkonium TMD fragmentation functions in NRQCD
论文作者
论文摘要
我们研究了单个轻质片段碎片机制的Quarkonium产生的横向摩托谱。在半包含的深度非弹性散射的情况下，我们观察到有两个可能的启动过程，即光子 - - 杜松融合和轻夸克碎片。对于第二种情况，我们得出了分解定理，涉及一个新的HADRONEN数量：NRQCD中的Quarkonium横向momentum依赖性片段化函数。我们以最低顺序计算它们在强耦合常数（$ {\ MATHCAL O}（α_s^2）$中，以最低顺序计算它们的匹配。为了关注电子离子对撞机的情况，我们对两种生产机制进行了比较现象学研究，并找到了一个相位空间的区域，其中一个地区占另一个生产机制。
We study the transverse-momentum spectrum of quarkonium production from single light-parton fragmentation mechanism. In the case of semi-inclusive deep inelastic scattering, we observe that there are two possible initiating processes, namely photon-gluon fusion and light-quark fragmentation. For the second case we derive the factorization theorem, which involves a new hadronic quantity: the quarkonium transverse-momentum-dependent fragmentation functions in NRQCD. We calculate their matching onto the non-perturbative long distance matrix elements at the lowest order in the strong-coupling constant (${\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.
