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[en] The amounts of d-bar and u-bar in the proton were expected to be the same based on the flavor independence of gluon splitting. However, muon deep inelastic scattering experiment NMC at CERN found that the amount of d-bar is larger than u-bar in the proton. Bjorken x dependence of the sea quark flavor asymmetry can be studied in Drell-Yan experiments. The E866 experiment at Fermilab showed that d-bar(x)/u-bar(x) > 1.0 at 0.015 < x < 0.20. SeaQuest at Fermilab measures the light-antiquark flavor asymmetry d-bar/u-bar precisely in a large x range (0.15 < x < 0.45) including the unrevealed region in E866. It uses a 120 GeV proton beam extracted from Fermilab Main Injector colliding with liquid hydrogen and deuterium targets to measure the Drell-Yan process. The light-antiquark flavor asymmetry d-bar(x)/u-bar(x) is derived from the cross section ratio of proton-deuteron to proton-proton Drell-Yan processes. SeaQuest released the preliminary result in 2016. The analyses toward final results are in progress. (author)
Source
Dote, Akinobu; Morimatsu, Osamu (High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki (Japan)) (eds.); Goto, Yuji (ed.) (RIKEN, Wako, Saitama (Japan)) (and others); [780 p.]; ISBN 978-4-89027-136-8; 
; 2019; p. 021011.1-021011.4; QNP2018: 8. international conference on quarks and nuclear physics; Tsukuba, Ibaraki (Japan); 13-17 Nov 2018; Available from https://doi.org/10.7566/JPSCP.26.021011; 8 refs., 3 figs.
; 2019; p. 021011.1-021011.4; QNP2018: 8. international conference on quarks and nuclear physics; Tsukuba, Ibaraki (Japan); 13-17 Nov 2018; Available from https://doi.org/10.7566/JPSCP.26.021011; 8 refs., 3 figs.