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Bayesian Monte Carlo extraction of sea asymmetry with SeaQuest and STAR data

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arxiv 2109.00677 v2 pith:NZREFQHC submitted 2021-09-02 hep-ph hep-exnucl-th

C. Cocuzza , W. Melnitchouk , A. Metz , N. Sato This is my paper
classification hep-phhep-exnucl-th
keywords dataseaquestasymmetrybayesiancarlomontepartonstar
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We perform a global QCD analysis of unpolarized parton distributions within a Bayesian Monte Carlo framework, including the new $W$-lepton production data from the STAR Collaboration at RHIC and Drell-Yan di-muon data from the SeaQuest experiment at Fermilab. We assess the impact of these two new measurements on the light antiquark sea in the proton, and the $\bar{d}-\bar{u}$ asymmetry in particular. The SeaQuest data are found to significantly reduce the uncertainty on the $\bar{d}/\bar{u}$ ratio at large parton momentum fractions $x$, strongly favoring an enhanced $\bar{d}$ sea up to $x \approx 0.4$, in general agreement with nonperturbative calculations based on chiral symmetry breaking in QCD.

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Cited by 4 Pith papers

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