Fragmentation contributions to hadroproduction of prompt J/psi, chi(cJ), and psi(2S) states
Fragmentation contributions to hadroproduction of prompt J/psi, chi(cJ), and psi(2S) states
复制标题
碎片对即时 J/psi、chi(cJ) 和 psi(2S) 状态的生育的贡献
DOI：
10.1103/physrevd.93.034041
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发表时间：
2016
影响因子：
5
通讯作者：
Ma Yan-Qing
中科院分区：
文献类型：
--
作者：
Bodwin Geoffrey T.;Chao Kuang-Ta;Chung Hee Sok;Kim U-Rae;Lee Jungil;Ma Yan-Qing
我们计算了夸克偶素态强子产生的碎裂修正，和在的主导幂，其中是粲夸克质量，是夸克偶素横动量。计算是在非相对论QCD框架下进行的。在强耦合中，我们通过次领先顺序对部分子产生截面进行了修正，在强耦合中，我们通过第二顺序对碎裂函数进行了修正。我们还总结了微扰论中所有阶次的导函数.我们发现，当我们结合联合收割机这些领先的功率碎裂修正与固定阶计算通过次领先的顺序，我们能够得到很好的拟合到强子产生截面的测量在Tevatron和LHC。使用我们从截面拟合中提取的非微扰长距离矩阵元的值，我们对夸克偶素态的极化进行了预测。我们得到了很好的协议与测量的偏振，除了CDF运行II测量的duplex偏振，该协议是公平的。在对非线性截面和极化的预测中，我们考虑了来自和态的反馈。
We compute fragmentation corrections to hadroproduction of the quarkonium states,, andat leading power in, whereis the charm-quark mass andis the quarkonium transverse momentum. The computation is carried out in the framework of nonrelativistic QCD. We include corrections to the parton-production cross sections through next-to-leading order in the strong couplingand corrections to the fragmentation functions through second order in. We also sum leading logarithms ofto all orders in perturbation theory. We find that, when we combine these leading-power fragmentation corrections with fixed-order calculations through next-to-leading order in, we are able to obtain good fits forto hadroproduction cross sections that were measured at the Tevatron and the LHC. Using values for the nonperturbative long-distance matrix elements that we extract from the cross-section fits, we make predictions for the polarizations of the quarkonium states. We obtain good agreement with measurements of the polarizations, with the exception of the CDF Run II measurement of the promptpolarization, for which the agreement is only fair. In the predictions for the prompt-cross sections and polarizations, we take into account feeddown from theandstates.