Measurement of Light-antiquark Flavor Asymmetry by Drell–Yan Experiment SeaQuest at Fermilab
- Taiwan, Inst. Phys.
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 Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- SeaQuest
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1854892
- Report Number(s):
- FERMILAB-CONF-19-850-V; oai:inspirehep.net:1764528
- Journal Information:
- JPS Conf.Proc., Vol. 26; Conference: 8th Int. Conf. Quarks and Nuclear Physics (QNP2018)
- Country of Publication:
- United States
- Language:
- English
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