Impact of SeaQuest data on PDF fits at large x
Abstract We evaluate the impact of recent SeaQuest (FNAL-E906 experiment) data on dimuon production in proton-deuteron and proton-proton collisions on parton distribution functions (PDFs). We find these data in a good agreement with the QCD predictions based on PDFs fitted to the Tevatron and LHC da...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2023-09-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-023-11999-6 |
| _version_ | 1797647214399455232 |
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| author | S. Alekhin M. V. Garzelli S. Kulagin S.-O. Moch |
| author_facet | S. Alekhin M. V. Garzelli S. Kulagin S.-O. Moch |
| author_sort | S. Alekhin |
| collection | DOAJ |
| description | Abstract We evaluate the impact of recent SeaQuest (FNAL-E906 experiment) data on dimuon production in proton-deuteron and proton-proton collisions on parton distribution functions (PDFs). We find these data in a good agreement with the QCD predictions based on PDFs fitted to the Tevatron and LHC data on forward production of W and Z bosons. As a basis for this study we use the ABMP16 PDF fits and show that they turn out to be compatible with the SeaQuest data, and that these data have constraining power, allowing to reduce the uncertainties on the isospin asymmetry of the light-sea-quark distribution at large longitudinal momentum fraction x. We discuss the nuclear corrections needed to describe the deuteron and show that they affect the theoretical description of the proton-deuteron Drell–Yan cross section at the level of $$\mathcal {O}(0.5{-}1)$$ O ( 0.5 - 1 ) %. We also comment on the compatibility of the SeaQuest results with other state-of-the-art PDF fits and show that these data are in clear disagreement with models proposing an SU(3)-flavor symmetric quark sea. Finally, we perform a comparison between the second Mellin moments of the light-quark PDFs and recent results from various lattice QCD computations, which demonstrates good compatibility, albeit limited by the uncertainties inherent in current lattice QCD simulations. |
| first_indexed | 2024-03-11T15:13:02Z |
| format | Article |
| id | doaj.art-b2c9d22030154bc485f7d83017f2dc6c |
| institution | Directory Open Access Journal |
| issn | 1434-6052 |
| language | English |
| last_indexed | 2024-03-11T15:13:02Z |
| publishDate | 2023-09-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-b2c9d22030154bc485f7d83017f2dc6c2023-10-29T12:34:38ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522023-09-0183911610.1140/epjc/s10052-023-11999-6Impact of SeaQuest data on PDF fits at large xS. Alekhin0M. V. Garzelli1S. Kulagin2S.-O. Moch3II. Institut für Theoretische Physik, Universität HamburgII. Institut für Theoretische Physik, Universität HamburgInstitute for Nuclear Research of the Russian Academy of SciencesII. Institut für Theoretische Physik, Universität HamburgAbstract We evaluate the impact of recent SeaQuest (FNAL-E906 experiment) data on dimuon production in proton-deuteron and proton-proton collisions on parton distribution functions (PDFs). We find these data in a good agreement with the QCD predictions based on PDFs fitted to the Tevatron and LHC data on forward production of W and Z bosons. As a basis for this study we use the ABMP16 PDF fits and show that they turn out to be compatible with the SeaQuest data, and that these data have constraining power, allowing to reduce the uncertainties on the isospin asymmetry of the light-sea-quark distribution at large longitudinal momentum fraction x. We discuss the nuclear corrections needed to describe the deuteron and show that they affect the theoretical description of the proton-deuteron Drell–Yan cross section at the level of $$\mathcal {O}(0.5{-}1)$$ O ( 0.5 - 1 ) %. We also comment on the compatibility of the SeaQuest results with other state-of-the-art PDF fits and show that these data are in clear disagreement with models proposing an SU(3)-flavor symmetric quark sea. Finally, we perform a comparison between the second Mellin moments of the light-quark PDFs and recent results from various lattice QCD computations, which demonstrates good compatibility, albeit limited by the uncertainties inherent in current lattice QCD simulations.https://doi.org/10.1140/epjc/s10052-023-11999-6 |
| spellingShingle | S. Alekhin M. V. Garzelli S. Kulagin S.-O. Moch Impact of SeaQuest data on PDF fits at large x European Physical Journal C: Particles and Fields |
| title | Impact of SeaQuest data on PDF fits at large x |
| title_full | Impact of SeaQuest data on PDF fits at large x |
| title_fullStr | Impact of SeaQuest data on PDF fits at large x |
| title_full_unstemmed | Impact of SeaQuest data on PDF fits at large x |
| title_short | Impact of SeaQuest data on PDF fits at large x |
| title_sort | impact of seaquest data on pdf fits at large x |
| url | https://doi.org/10.1140/epjc/s10052-023-11999-6 |
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