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arXiv 2608.12556hep-ph

Zγ产生的N³LO软胶子修正

N$^3$LO soft-gluon corrections for $Zγ$ production

Nikolaos Kidonakis, Kaan Şimşek

AI总结:

该研究计算Zγ产生的N³LO软胶子修正,得到aN³LO QCD预言,在LHC 13、13.6 TeV能下计算微分截面,量化不确定度,发现高p_T区修正显著且aN³LO阶收敛良好。

AI中文摘要:

我们在单粒子包含(1PI)运动学中,计算了Zγ产生的次-次-次领头阶(N³LO)软胶子修正。利用这些结果,我们给出了LHC能量下质子-质子碰撞中Zγ产生截面的近似N³LO(aN³LO)量子色动力学(QCD)预言,在13 TeV和13.6 TeV对撞能量下,计算了光子横动量p_T^γ和快度y^γ的微分截面。我们系统研究了高阶K因子,并在每个微扰阶量化了能标和部分分布函数(PDF)的不确定度。结果表明,软胶子修正在高p_T区域十分显著,且在aN³LO阶观察到良好的微扰收敛性。

英文摘要:

We calculate soft-gluon corrections for $Zγ$ production through next-to-next-to-next-to-leading-order (N$^3$LO) in one-particle-inclusive (1PI) kinematics. We use these results to produce approximate N$^3$LO (aN$^3$LO) QCD predictions for $Zγ$ production cross sections in proton-proton collisions at LHC energies. Differential cross sections in photon transverse momentum $p_T^γ$ and rapidity $y^γ$ are computed at 13 TeV and 13.6 TeV collider energies. Higher-order $K$-factors are examined systematically, and scale and PDF uncertainties are quantified at each perturbative order. Soft-gluon corrections are found to be significant in the high-$p_T$ region, with good perturbative convergence observed at aN$^3$LO.

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