标题： B工厂中底夸克态的独占产生高阶修正 显示英文标题

标题： Higher-order corrections to exclusive production of charmonia at B factories

摘要： 作为非相对论量子色动力学（NRQCD）因子化方法中颜色单态机制的测试，我们考虑了在B工厂中电子-正电子湮灭过程e+ e- -> eta_c + gamma和e+ e- -> J/psi + J/psi中的独占双夸克onium产生。 截面计算到alpha_s的次领头阶，并在每个介子静止系中重夸克的相对速度v的一半的所有阶次进行了重求和。 在相同理论精度水平下，e+ e- -> J/psi + eta_c的截面理论预测与现有的实验数据一致。 本工作中新计算的e+ e- -> eta_c + gamma和e+ e- -> J/psi + J/psi的截面可以与未来超级B工厂的数据进行对比测试。 显示英文摘要

摘要： As a test of the color-singlet mechanism of the nonrelativistic QCD (NRQCD) factorization approach, we consider the exclusive two-quarkonium productions in electron-positron annihilation e+ e- -> eta_c + gamma and e+ e- -> J/psi + J/psi at B factories. The cross sections are computed to the next-to-leading order in alpha_s and are resummed to all orders in half the relative velocity v of the charm quark in each meson rest frame. The available theoretical prediction of the cross section for e+ e- -> J/psi + eta_c at the same level of theoretical accuracies is consistent with the available experimental data. Those for e+ e- -> eta_c + gamma and e+ e- -> J/psi + J/psi that are computed new in this work can be tested against the data from future super B factories.