Upsilon(nS) and chi(b)(nP) production at hadron colliders in nonrelativistic QCD
Upsilon(nS) and chi(b)(nP) production at hadron colliders in nonrelativistic QCD
复制标题
非相对论性 QCD 强子对撞机中的 Upsilon(nS) 和 chi(b)(nP) 产生
DOI：
10.1103/physrevd.94.014028
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发表时间：
2016
影响因子：
5
通讯作者：
Chao Kuang-Ta
中科院分区：
文献类型：
--
作者：
Han Hao;Ma Yan-Qing;Meng Ce;Shao Hua-Sheng;Zhang Yu-Jie;Chao Kuang-Ta
在非相对论QCD中，研究了大型强子对撞机上ϒ(NS)和(，2，3)的产生。对于较低的ϒ截面和极化，都考虑了来自较高和ϒ态的下馈贡献。从产额数据中提取长距离矩阵元素(LDME)，然后用来预测ϒ(NS)极化，其结果与测量的极化数据在误差范围内是一致的。特别是，ϒ(3S)极化之谜可以用态的大反馈贡献来理解。我们的结果可以很好地描述瞬发ϒ(NS)的截面和极化以及在大型强子对撞机上的产生。
ϒ(nS) and(, 2, 3) production at the LHC is studied at next-to-leading order inin nonrelativistic QCD. Feeddown contributions from higherand ϒ states are all considered for lower ϒ cross sections and polarizations. The long distance matrix elements (LDMEs) are extracted from the yield data, and then used to make predictions for the ϒ(nS) polarizations, which are found to be consistent with the measured polarization data within errors. In particular, the ϒ(3S) polarization puzzle can be understood by a large feeddown contribution fromstates. Our results may provide a good description for both cross sections and polarizations of prompt ϒ(nS) andproduction at the LHC.