Bayesian Monte Carlo extraction of the sea asymmetry with SeaQuest and STAR data BAYESIAN MONTE CARLO EXTRACTION of the SEA ... C. COCUZZA, W. MELNITCHOUK, A. METZ, and N. SATO
Journal
Physical Review D
Journal Volume
104
Journal Issue
7
Date Issued
2021
Author(s)
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 dimuon 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 d¯-? asymmetry in particular. The SeaQuest data are found to significantly reduce the uncertainty on the d¯/? ratio at large parton momentum fractions x, strongly favoring an enhanced d¯ sea up to x?0.4, in general agreement with nonperturbative calculations based on chiral symmetry breaking in QCD. ? 2021 authors.
SDGs
Type
journal article