面向夸克偶素产生的全NLO高能因子化
Towards High-Energy Factorization at Full NLO for Quarkonium Production
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中文总结 AI 辅助
本文报道了首个完整的NLO BFKL冲击因子，用于重夸克偶素产生，具有精确质量依赖，为全NLL前向产生研究奠定基础。
中文摘要 AI 辅助
在LHC上，重夸克偶素的强子产生可以触及部分子质心能量远大于夸克偶素质量与横动量的运动学构型。在此能区，由于碰撞能量的大对数未被重求和，固定阶预言可能变得不稳定。将高能因子化推广到超越领头对数，需要过程依赖的次领头阶（NLO）冲击因子。我们报道了首个完整的NLO BFKL冲击因子，其具有精确的重夸克质量依赖，适用于NRQCD态${}^1S_0^{[1]}$、${}^1S_0^{[8]}$和${}^3S_1^{[8]}$的产生。通过局域相减程序，将实发射计算与先前已知的虚修正相结合。软奇点相互抵消，初态共线极点被吸收进部分子分布函数，快度发散则由BFKL因子化移除。这些结果为前向夸克偶素以及具有大快度间隔的夸克偶素伴随产生的全NLL研究提供了所需要素。
英文摘要
Heavy-quarkonium hadroproduction at the LHC can access kinematic configurations in which the partonic center-of-mass energy is much larger than the quarkonium mass and transverse momentum. Fixed-order predictions may become unstable in this regime because large logarithms of the collision energy are not resummed. Extending high-energy factorization beyond leading logarithms requires process-dependent impact factors at next-to-leading order (NLO). We report the first complete NLO BFKL impact factors, with exact heavy-quark-mass dependence, for the production of the NRQCD states ${}^1S_0^{[1]}$, ${}^1S_0^{[8]}$, and ${}^3S_1^{[8]}$. The real-emission calculation is combined with the previously known virtual corrections through a local subtraction procedure. Soft singularities cancel, initial-state collinear poles are absorbed into the parton distributions, and rapidity divergences are removed by BFKL factorization. These results provide the ingredients needed for full-NLL studies of forward quarkonium and of quarkonium-associated production with a large rapidity separation.
