The persistent nonperturbative charm enigma
arXiv:2211.01387 · doi:10.1016/j.physletb.2023.137975
Abstract
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.
arXiv comment10 pages, 2 figures in main Letter; includes 6 pages of Supplementary Discussion with 6 additional figures; updated following publication in PLB 843 (2023) 137975
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