论文标题
$χ_c$在修改的NRQCD中生产
$χ_c$ production in modified NRQCD
论文作者
论文摘要
在上一篇论文中，我们通过考虑了颜色Quarkonium Quarkonium State的扰动软光洛luon排放的影响，修改了非权威性QCD，因为它适用于Quarkonium生产。我们通过从Tevatron数据中拟合未知的非扰动参数来测试模型，并使用该模型对LHC的$ J/ψ$和$ψ'$生产进行无参数预测。在本文中，我们研究了$χ_c$生产：我们像使用Tevatron的数据一样适合未知矩阵元素。然后，我们通过将$χ_c$ feed-down的效果计算到$ j/ψ$横截面的效果来扩展上一篇论文的结果，以$ j/ψ$的产生，通过将$ j/ψ$ cross部分与$ \ sqrt {s} = $ 13 tev进行比较，我们证明很小。我们还计算了$χ_c^1 $和$χ_c^2 $ at $ \ sqrt {s} = $ 7 tev，并与Atlas实验中的数据找到了极好的一致性。
In a previous paper, we had modified Non-Relativistic QCD as it applies to quarkonium production by taking into account the effect of perturbative soft-gluon emission from the colour-octet quarkonium states. We tested the model by fitting the unknown non-perturbative parameter in the model from Tevatron data and using that to make parameter-free predictions for $J/ψ$ and $ψ'$ production at the LHC. In this paper, we study $χ_c$ production: we fit as before the unknown matrix-element using data from Tevatron. We, then, extend the results of the previous paper for $J/ψ$ production by calculating the effect of $χ_c$ feed-down to the $J/ψ$ cross-section, which, by comparing with CMS results at $\sqrt{s}=$ 13 TeV, we demonstrate to be small. We have also computed $χ_c^1$ and $χ_c^2$ at $\sqrt{s}=$7 TeV and find excellent agreement with data from the ATLAS experiment.
