Strangeness in the proton from $W+$ charm production and SIDIS data

Anderson, Trey; Melnitchouk, W.; Sato, N.

doi:10.1103/7h25-3lg7

Strangeness in the proton from $W+$ charm production and SIDIS data

Journal Article · Fri Nov 07 00:00:00 EST 2025 · Physical Review. D.

DOI:https://doi.org/10.1103/7h25-3lg7· OSTI ID:3001566

^[1]; ^[2]; Sato, N. ^[2]

College of William and Mary, Williamsburg, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

We perform a global QCD analysis of unpolarized parton distribution functions (PDFs) in the proton, including new 𝑊+⁢ charm production data from 𝑝⁢𝑝 collisions at the LHC and semi-inclusive pion and kaon production data in lepton-nucleon deep-inelastic scattering, both of which have been suggested for constraining the strange quark PDF. Compared with a baseline global fit that does not include these datasets, the new analysis reduces the uncertainty on the strange quark distribution over the range 0.01 < 𝑥 < 0.3, and provides a consistent description of processes sensitive to strangeness in the proton. Including the new datasets, the ratio of strange to nonstrange sea quark distributions is $$R_s = (s + \bar{s})/(\bar{u} +\bar{d})$$ $$=$$ {$$0.7⁢2^{+0.52}_{−0.34}, 0.4⁢6^{+0.30}_{−0.20}, 0.3⁢2^{+0.23}_{−0.15}$$} for 𝑥 ={$$0.01, 0.04, 0.1$} at 𝑄² $$=$$ 4 GeV². The data place more stringent constraints on the strange asymmetry $$(s - \bar{s})$$, which is found to be consistent with zero in this range.

View Accepted Manuscript (DOE)

Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC05-06OR23177

OSTI ID:: 3001566

Report Number(s):: DOE/OR/23177--7761; JLAB-THY--25-6; arXiv:2501.00665

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 9 Vol. 112; ISSN 2470-0010; ISSN 2470-0029

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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