在NICA能量下质子-质子碰撞中产生即时光子的夸克-反夸克对湮灭子过程微分截面的次领头阶

中文摘要 AI 辅助

研究了在NICA能量下非极化和纵向极化质子-质子碰撞中，夸克-反夸克对\(q\bar{q} \rightarrow g\gamma\)湮灭子过程产生即时光子的微分截面的次领头阶。结果表明，在高碰撞质子能量下，该次领头阶对夸克-反夸克对\(q\bar{q} \rightarrow g\gamma\)湮灭微分截面的贡献显著，约占领头阶计算的15%。碰撞质子的纵向极化对次领头阶贡献的影响比对领头阶的影响更显著，在高碰撞质子能量下很重要。使用PYTHIA 8.316 + POWHEG BOX蒙特卡罗事件发生器对夸克-反夸克对湮灭产生即时光子进行了NLO近似的数值模拟，以确定截面与碰撞质子能量和\(\sqrt{s}\)、横向动量\(p_{T}\)、散射角余弦\(Cos(\theta)\)、光子快度\(y\)和\(x_{T}\)的依赖关系。NLO+PS模拟准确再现了pQCD的基本特征。

英文摘要

Next-to-the leading order of the differential cross-section of the subprocess of annihilation of quark-antiquark pair \(q\bar{q} \rightarrow gγ\) of prompt photon production in nonpolarized and longitudinally polarized proton-proton collisions at NICA energies has been investigated. Shown, that contribution of the next-to-leading order to the differential cross-section of annihilation of quark-antiquark pair \(q\bar{q} \rightarrow gγ\) is significant at the high energies of colliding protons and consist around 15\% of leading order calculation. The influence of longitudinal polarization of colliding protons on the contributions of the next-to-leading order is more significant than, on the contributions of the leading order and it is significant at high energies of colliding protons. PYTHIA 8.316 \textbf{+} POWHEG BOX Monte Carlo (MC) event generator has been used for numerically simulation of prompt photon production in annihilation of quark-antiquark pair in NLO approximation for determination of the dependences of cross section on the sum of energies of colliding protons \(\sqrt{s}\), transverse momentum \(p_{T}\), cosine of scattering angle \(Cos(θ)\), rapidity y of photon and \(x_{T}\). The NLO+PS simulation accurately reproduces the fundamental signatures of pQCD.

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27 pqges, 33 figures. arXiv admin note: text overlap with arXiv:2606.19389