部分子Regge化方法NLO${}^\star$近似下的单孤立光子产生
Single isolated photon production in the NLO${}^\star$ approximation of the Parton Reggeization Approach
中文总结 AI 辅助
本文在部分子Regge化方法NLO${}^\star$近似下研究单孤立光子强子产生，提出减除方案避免双重计数并验证自洽性，计算结果与多个实验数据在宽能量范围内符合良好。
中文摘要 AI 辅助
在基于硬散射QCD振幅修正Multi-Regge极限的部分子Regge化方法的NLO${}^\star$近似框架内，研究了高能下单个孤立光子的强子产生过程。考虑了领头阶子过程 $Q \bar Q \to γ$ 以及NLO树级修正 $Q R \to γq$ 和 $Q \bar Q \to γg$ 的贡献。为了避免硬散射系数的树级修正与非积分PDF之间在快度上的特定双重计数，提出了一种相应的减除方案。我们利用该减除方案证明了部分子Regge化方法的自洽性。计算结果与多个合作组在 $\sqrt{S} = 24 \\ {\rm GeV} - 13 \\ {\rm TeV}$ 宽能量范围内的数据进行了比较。我们得到了与数据相当令人满意的一致性，直至 $p_T^γ/ \sqrt{S} \simeq 0.2 - 0.3$。讨论了未来SPD NICA实验的预言。
英文摘要
The hadroproduction of single isolated photon at high energies is studied within the framework of the NLO${}^\star$ approximation of the Parton Reggeization Approach based on the modified Multi-Regge limit of the hard scattering QCD amplitudes. The contribution from the LO subprocess $Q \bar Q \to γ$ and the NLO tree-level corrections $Q R \to γq$ and $Q \bar Q \to γg$ are considered. To avoid specific double counting in rapidity between tree-level corrections to the hard scattering coefficient and unintegrated PDFs, a corresponding subtraction scheme is proposed. We demonstrated self-consistency of the Parton Reggeization Approach using the subtraction scheme. The results of calculations are compared with data from various Collaborations in the wide energy range $\sqrt{S} = 24 \ {\rm GeV} - 13 \ {\rm TeV}$. We obtained a quite satisfactory agreement with data up to $p_T^γ/ \sqrt{S} \simeq 0.2 - 0.3$. Predictions for the future SPD NICA experiment were discussed.
