@article{7cea8d9b7ba34904b60541d3c0f1e217,
title = "Measurement of the light antiquark flavor asymmetry in the nucleon sea",
abstract = "A precise measurement of the ratio of Drell-Yan yields from an800GeV/c proton beam incident on hydrogen and deuterium targets is reported. Over 140 000 Drell-Yan muon pairs with dimuon mass Mµ+µ−≥4.5 GeV/c2 were recorded. From these data, the ratio of antidown (d¯) to antiup (u¯) quark distributions in the proton sea is determined over a wide range in Bjorken x. A strong x dependence is observed in the ratio d¯/u¯, showing substantial enhancement of d¯ with respect to u¯ for x<0.2. This result is in fair agreement with recent parton distribution parametrizations of the sea. For x>0.2, the observed d¯/u¯ ratio is much nearer unity than given by the parametrizations.",
author = "{Fermilab E866/NuSea Collaboration} and Hawker, {E. A.} and Awes, {T. C.} and Beddo, {M. E.} and Brown, {C. N.} and Bush, {J. D.} and Carey, {T. A.} and Chang, {T. H.} and Cooper, {W. E.} and Gagliardi, {C. A.} and Garvey, {G. T.} and Geesaman, {D. F.} and He, {X. C.} and Isenhower, {L. D.} and Kaufman, {S. B.} and Kaplan, {D. M.} and Kirk, {P. N.} and Koetke, {D. D.} and G. Kyle and Lee, {D. M.} and Lee, {W. M.} and Leitch, {M. J.} and N. Makins and McGaughey, {P. L.} and Moss, {J. M.} and Mueller, {B. A.} and Nord, {P. M.} and Park, {B. K.} and V. Papavassiliou and Peng, {J. C.} and G. Petitt and Reimer, {P. E.} and Sadler, {M. E.} and J. Selden and Stankus, {P. W.} and Sondheim, {W. E.} and Thompson, {T. N.} and Towell, {R. S.} and Tribble, {R. E.} and Vasiliev, {M. A.} and Wang, {Y. C.} and Wang, {Z. F.} and Webb, {J. C.} and Willis, {J. L.} and Wise, {D. K.} and Young, {G. R.}",
year = "1998",
doi = "10.1103/PhysRevLett.80.3715",
language = "English (US)",
volume = "80",
pages = "3715--3718",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "17",
}