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Measurement of Light-antiquark Flavor Asymmetry by Drell–Yan Experiment SeaQuest at Fermilab

Conference · · JPS Conf.Proc.
 [1]
  1. Taiwan, Inst. Phys.
+ Show Author Affiliations
The amounts of \(\bar{d}\) and \(\bar{u}\) 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 \(\bar{d}\) is larger than \(\bar{u}\) 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 \(\bar{d}(x)/\bar{u}(x) > 1.0\) at \(0.015 < x < 0.20\). SeaQuest at Fermilab measures the light-antiquark flavor asymmetry \(\bar{d}/\bar{u}\) 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 \(\bar{d}(x)/\bar{u}(x)\) 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.
Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Organization:
SeaQuest
DOE Contract Number:
AC02-07CH11359
OSTI ID:
1854892
Report Number(s):
FERMILAB-CONF-19-850-V; oai:inspirehep.net:1764528
Conference Information:
Journal Name: JPS Conf.Proc. Journal Volume: 26
Country of Publication:
United States
Language:
English

References (8)

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Measurement of the Light Antiquark Flavor Asymmetry in the Nucleon Sea journal April 1998
The Drell–Yan process as a testing ground for parton distributions up to LHC journal April 2016
Reevaluation of the Gottfried sum journal July 1994
Sum Rule for High-Energy Electron-Proton Scattering journal June 1967
Study of the isospin symmetry breaking in the light quark sea of the nucleon from the Drell-Yan process journal July 1994
Massive Lepton-Pair Production in Hadron-Hadron Collisions at High Energies journal August 1970

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Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS