arXiv 1709.041542017-09hep-phhep-exnucl-exnucl-th

在LHC的瞬发光子产生和光子喷注关联

Prompt photon production and photon-jet correlations at the LHC

M. Klasen, C. Klein-Bösing, H. Poppenborg

备注：: 20 pages, 13 figures
DOI：: 10.1007/JHEP03(2018)081

摘要：

下一个领先的顺序预测匹配到部分子阵雨的比较与最近的ATLAS数据包容性的光子生产和CMS数据相关的光子和射流生产在PP和pPb碰撞在不同的质量中心能量的大型强子对撞机。我们发现很好的协议，并如预期的那样，大大减少规模的不确定性相比，以前的理论计算。预测的比率的包容性光子超过衰变光子$R_γ$，一个重要的数量来评估额外的光子源的意义，例如，从夸克胶子等离子体的热辐射，并在铅离子$x_{\rm Pb}^{\rm obs}$的部分子动量分数的分布，这可以确定由ALICE，ATLAS，CMS和LHCb在正在进行的分析光子+喷流产生的pPb碰撞在$\sqrt{s_{NN}}=5.02$ TeV。这些数据对确定低$x$时的遮蔽等核效应具有重要影响。

英文摘要：

Next-to-leading order predictions matched to parton showers are compared with recent ATLAS data on inclusive photon production and CMS data on associated photon and jet production in pp and pPb collisions at different centre-of-mass energies of the LHC. We find good agreement and, as expected, considerably reduced scale uncertainties compared to previous theoretical calculations. Predictions are made for the ratio of inclusive photons over decay photons $R_γ$, an important quantity to evaluate the significance of additional photon sources, e.g. thermal radiation from a Quark-Gluon-Plasma, and for distributions in the parton momentum fraction in lead ions $x_{\rm Pb}^{\rm obs}$, that could be determined by ALICE, ATLAS, CMS and LHCb in ongoing analyses of photon+jet production in pPb collisions at $\sqrt{s_{NN}}=5.02$ TeV. These data should have an important impact on the determination of nuclear effects such as shadowing at low $x$.

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