论文标题
在Tevatron和LHC的颜色蒸发模型中，单QCD的单QCD研究单和双夸氏剂量生产
Complete NLO QCD study of single- and double-quarkonium hadroproduction in the colour-evaporation model at the Tevatron and the LHC
论文作者
论文摘要
我们研究了LHC和PP（BAR）碰撞中的双Quarkonia（J/PSI+J/PSI，J/PSI+UPSILON和UPSILON+UPSILON）的单聚合物分裂（SPS）的生产，并在LHC和PP（BAR）碰撞中，根据CMS，ATLAS，ATLAS，LHCB和D0实验（Col）（Col）（Col）（Color）（COL）（COL）（COL）（COL）（COL）（COL）（COL）（COL）（COL）（COL）（COL）（COL）（COL）（COL）（COL）（COL）（COL）（COL）（COL）（COL）（Color）（Color）（COL）（COL）（COL）（COL）夸克 - 哈德隆二元性，包括临时领导顺序（NLO）QCD校正至alpha_s^5。为此，我们还对单Quarkonium生产的P_T差异横截面进行了第一个真正的NLO-Alpha_s^4-研究。这使我们能够在测量Quarkonium Pair数据的区域中以NLO的准确性固定非扰动CEM参数。我们的结果表明，NLO的CEM一般可以显着降低这些实验数据，并且鉴于其他现有的SPS研究，确认需要双Parton散射（DPS）以说明数据。我们对中和大P_T的单夸王产生的NLO研究也证实了该方法来解释测得的P_T光谱的难度；这让人联想到不可能将单夸王数据与鞋底碎片造成的鞋底3S18 NRQCD贡献。我们强调的是，差异发生在改进CEM的新特征无关的运动区域。
We study the Single-Parton-Scattering (SPS) production of double quarkonia (J/psi+J/psi, J/psi+Upsilon, and Upsilon+Upsilon) in pp and pp(bar) collisions at the LHC and the Tevatron as measured by the CMS, ATLAS, LHCb, and D0 experiments in the Colour-Evaporation Model (CEM), based on the quark-hadron-duality, including Next-to-Leading Order (NLO) QCD corrections up to alpha_s^5. To do so, we also perform the first true NLO --up to alpha_s^4-- study of the p_T-differential cross section for single-quarkonium production. This allows us to fix the non-perturbative CEM parameters at NLO accuracy in the region where quarkonium-pair data are measured. Our results show that the CEM at NLO in general significantly undershoots these experimental data and, in view of the other existing SPS studies, confirm the need for Double Parton Scattering (DPS) to account for the data. Our NLO study of single-quarkonium production at mid and large p_T also confirms the difficulty of the approach to account for the measured p_T spectra; this is reminiscent of the impossibility to fit single-quarkonium data with the sole 3S18 NRQCD contribution from gluon fragmentation. We stress that the discrepancy occurs in a kinematical region where the new features of the improved CEM are not relevant.
