论文标题
持续的非扰动魅力谜
The persistent nonperturbative charm enigma
论文作者
论文摘要
在质子中，非扰动性（通常称为“内在”）魅力的存在和可能的大小长期以来，长期以来都混淆了在高能实验的全球分析中清除这种贡献的尝试。在这封信中，我们表明可用的（非）扰动QCD理论和HADRONIC数据仍未达到足够的水平来清楚地解决此问题。我们重点介绍了许多具有挑战性的方面，这些方面在提取PDF拟合中的非扰动魅力时必须面临，因此，我们呈现了对拟合魅力（CT18 FC）的临近更新到领先的订单CT分析，我们也将其与最近的研究相比。我们概述了在此主题上取得进展所需的理论发展和未来数据。
The question of the existence and possible magnitude of nonperturbative (often called "intrinsic") charm in the proton has long confounded attempts to cleanly isolate such a contribution in global analyses of high-energy experiments. In this letter, we show that the available (non)perturbative QCD theory and hadronic data have still not developed to a sufficient level to clearly resolve this problem. We highlight a number of challenging aspects that must be confronted in extracting nonperturbative charm in PDF fits, and in so doing, present an updated next-to-next-to-leading order CT analysis of fitted charm, CT18 FC, which we also compare to recent studies. We outline the theory developments and future data needed to make progress on this subject.
