The persistent nonperturbative charm enigma
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 t...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-08-01
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| Series: | Physics Letters B |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S037026932300309X |
| _version_ | 1797776230477463552 |
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| author | Marco Guzzi T.J. Hobbs Keping Xie Joey Huston Pavel Nadolsky C.-P. Yuan |
| author_facet | Marco Guzzi T.J. Hobbs Keping Xie Joey Huston Pavel Nadolsky C.-P. Yuan |
| author_sort | Marco Guzzi |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-12T22:47:20Z |
| format | Article |
| id | doaj.art-8fd7ce4010794a5598ed6c4a76cf252d |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-03-12T22:47:20Z |
| publishDate | 2023-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-8fd7ce4010794a5598ed6c4a76cf252d2023-07-21T04:58:08ZengElsevierPhysics Letters B0370-26932023-08-01843137975The persistent nonperturbative charm enigmaMarco Guzzi0T.J. Hobbs1Keping Xie2Joey Huston3Pavel Nadolsky4C.-P. Yuan5Department of Physics, Kennesaw State University, Kennesaw, GA 30144, USAHigh Energy Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA; Corresponding author.Pittsburgh Particle Physics, Astrophysics, and Cosmology Center, Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USADepartment of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USADepartment of Physics, Southern Methodist University, Dallas, TX 75275-0181, USA; Fermi National Accelerator Laboratory, Batavia, IL 60510, USADepartment of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USAThe 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.http://www.sciencedirect.com/science/article/pii/S037026932300309XQuantum chromodynamicsParton distribution functionsCollider phenomenology |
| spellingShingle | Marco Guzzi T.J. Hobbs Keping Xie Joey Huston Pavel Nadolsky C.-P. Yuan The persistent nonperturbative charm enigma Physics Letters B Quantum chromodynamics Parton distribution functions Collider phenomenology |
| title | The persistent nonperturbative charm enigma |
| title_full | The persistent nonperturbative charm enigma |
| title_fullStr | The persistent nonperturbative charm enigma |
| title_full_unstemmed | The persistent nonperturbative charm enigma |
| title_short | The persistent nonperturbative charm enigma |
| title_sort | persistent nonperturbative charm enigma |
| topic | Quantum chromodynamics Parton distribution functions Collider phenomenology |
| url | http://www.sciencedirect.com/science/article/pii/S037026932300309X |
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