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19 April 2024

» arxiv » hep-ex/9803011

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Measurement of the Light Antiquark Flavor Asymmetry in the Nucleon Sea
E.A. Hawker ; T.C. Awes ; M.E. Beddo ; C.N. Brown ; J.D. Bush ; T.A. Carey ; T.H. Chang ; W.E. Cooper ; C.A. Gagliardi ; G.T. Garvey ; D.F. Geesaman ; X.C. He ; L.D. Isenhower ; S.B. Kaufman ; D.M. Kaplan ; P.N. Kirk ; D.D. Koetke ; G. Kyle ; D.M. Lee ; W.M. Lee ; M.J. Leitch ; N. Makins ; P.L. McGaughey ; J.M. Moss ; B.A. Mueller ; P.M. Nord ; B.K. Park ; V. Papavassiliou ; J.C. Peng ; G. Petitt ; P.E. Reimer ; M.E. Sadler ; J. Selden ; P.W. Stankus ; W.E. Sondheim ; T.N. Thompson ; R.S. Towell ; R.E. Tribble ; M.A. Vasiliev ; Y.C. Wang ; Z.F. Wang ; J.C. Webb ; J.L. Willis ; D.K. Wise ; G.R. Young ;
Date:	12 Mar 1998
Journal:	Phys.Rev.Lett. 80 (1998) 3715-3718
Subject:	hep-ex
Abstract:	A precise measurement of the ratio of Drell-Yan yields from an 800 GeV/c proton beam incident on hydrogen and deuterium targets is reported. Over 140,000 Drell-Yan muon pairs with dimuon mass M_{mu+ mu-} >= 4.5 GeV/c^2 were recorded. From these data, the ratio of anti-down (dbar) to anti-up (ubar) quark distributions in the proton sea is determined over a wide range in Bjorken-x. A strong x dependence is observed in the ratio dbar/ubar, showing substantial enhancement of dbar with respect to ubar for x<0.2. This result is in fair agreement with recent parton distribution parameterizations of the sea. For x>0.2, the observed dbar/ubar ratio is much nearer unity than given by the parameterizations.
Source:	arXiv, hep-ex/9803011
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