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Exclusive vector-quarkonium photoproduction at NLO in αs in collinear factorisation with evolution of the generalised parton distributions and high-energy resummation
Physics Letters B ( IF 4.3 ) Pub Date : 2024-11-06 , DOI: 10.1016/j.physletb.2024.139117
C.A. Flett, J.P. Lansberg, S. Nabeebaccus, M. Nefedov, P. Sznajder, J. Wagner

We perform the first complete one-loop study of exclusive photoproduction of vector quarkonia off protons in Collinear Factorisation (CF) including the scale evolution of the Generalised Parton Distributions (GPDs). We confirm the perturbative instability of the cross section at high photon-proton-collision energies (Wγp) at Next-to-Leading Order (NLO) in αs and solve this issue by resumming higher-order QCD corrections, which are enhanced by a logarithm of the parton energies, using High-Energy Factorisation (HEF) in the Doubly-Logarithmic Approximation (DLA) matched to CF. Our NLO CF ⊕ DLA HEF results are in agreement with the latest HERA data and show a smaller sensitivity to the factorisation and renormalisation scales compared to Born-order results. Quark-induced channels via interference with gluon ones are found to contribute at most 20% of the cross section for Wγp>100 GeV. Our results also show that such exclusive cross sections cannot be accurately obtained from the square of usual Parton Distribution Functions (PDFs) and clearly illustrate the importance of quarkonium exclusive photoproduction to advance our understanding of the 3D content of the nucleon in terms of gluons. Our work provides an important step towards a correct interpretation of present and future experimental data collected at HERA, the EIC, the LHC and future experiments.

中文翻译:


在共线分解中,NLO 的 αs 中独占矢量夸克鎓光产生,以及广义 parton 分布的演变和高能量求和



我们进行了第一个完整的单环研究,研究了共线分解 (CF) 中质子的矢量夸科尼亚的独家光生产,包括广义帕顿分布 (GPD) 的尺度演变。我们确认了在高光子-质子碰撞能量 (Wγp) 下以 αs 为单位的次前导 (NLO) 下横截面的扰动不稳定性,并通过重新汇总高阶 QCD 校正来解决这个问题,这些校正通过部分能量的对数增强,使用与 CF 匹配的二对数近似 (DLA) 中的高能量因子分解 (HEF)。我们的 NLO CF ⊕ DLA HEF 结果与最新的 HERA 数据一致,并显示出对因子分解和与 Born-order 结果相比,再归一化量表。发现通过干扰胶子诱导的夸克通道最多贡献 Wγp>100 GeV 横截面的 20%。我们的结果还表明,这种排他截面无法从通常的 Parton 分布函数 (PDF) 的平方中准确获得,并清楚地说明了 quarkonium 排他光生产的重要性,以促进我们对核子的 3D 含量(以胶子为单位)的理解。我们的工作为正确解释在 HERA、EIC、LHC 和未来实验中收集的当前和未来实验数据提供了重要的一步。
更新日期:2024-11-06
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