标题： Tevatron和LHC上通过颜色八重态的Upsilon产生中的QCD修正 显示英文标题

标题： QCD corrections to Upsilon production via color-octet states at the Tevatron and LHC

摘要： NLO QCD修正对质子-质子对撞机上通过S波色八重态产生Υ粒子的计算。 在Tevatron和LHC上，Upsilon(^1S_0^8,^3S_1^8)的总截面的K因子（NLO与LO的比值）分别为1.313和1.379，而在LHC上分别为1.044和1.182。 通过拟合D0实验数据，得到了S波色八重态的矩阵元。 并给出了关于Υ产生新的预测。 关于包括Υ极化的预测存在较大的不确定性，这是由于来自χ_b的下级衰变产生的Υ的极化引起的。 为了进一步澄清这一情况，期望对直接产生的Υ的产生和极化进行新的测量。 显示英文摘要

摘要： The NLO QCD corrections to Upsilon production via S-wave color-octet states Upsilon(^1S_0^8,^3S_1^8) at the Tevatron and LHC is calculated. The K factors of total cross section (ratio of NLO to LO) are 1.313 and 1.379 for Upsilon(^1S_0^8) and Upsilon(^3S_1^8) at the Tevatron, while at the LHC they are 1.044 and 1.182, respectively. By fitting the experimental data from the D0, the matrix elements for S-wave color-octet states are obtained. And new predictions for Upsilon production are presented. The prediction for the polarization of inclusive Upsilon contains large uncertainty rising from the polarization of Upsilon from feed-down of chi_b. To further clarify the situation, new measurements on the production and polarization for direct Upsilon are expected.