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arXiv · 2312.12605

Impact of SeaQuest data on sea-quark PDFs at large $x$

S. Alekhin·M. V. Garzelli·S. Kulagin·S. -O. Moch
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Abstract

We investigate the impact of the recently released FNAL-E906 (SeaQuest) data on the ratio of proton-deuteron and proton-proton Drell-Yan production cross-sections on the sea quark PDFs. We find that they have constraining power on the light-quark sea isospin asymmetry $(\bar{d}-\bar{u})(x)$ and on the $(\bar{d}/\bar{u})(x)$ ratio at large longitudinal momentum fraction $x$ values, and that their constraints turn out to be compatible with those from Drell-Yan data in collider experiments (Tevatron and Large Hadron Collider) and in the old fixed-target experiment by the FNAL-E866 collaboration. We study the impact of nuclear corrections due to the deuteron target, finding them within 1% in most of the kinematic region covered by SeaQuest. We perform a new proton PDF fit, including SeaQuest data, using the ABMP16 methodology and we compare it to the ABMP16 baseline.

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S. Alekhin, M. V. Garzelli, S. Kulagin, S. -O. Moch. 2023-12-19. Impact of SeaQuest data on sea-quark PDFs at large $x$. https://arxiv.org/abs/2312.12605

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