X-DEPENDENCE OF THE PROTON STRUCTURE FUNCTIONS FROM INELASTIC ANTINEUTRINO-PROTON SCATTERING

From an analysis of 2275 »p ++X0 events at an average Q2 of 4.5 GeV2, there are presented the first measurements, up to one undetermined overall normalization constant, of the x dependence of the proton structure functions using antineutrinos, and of the u and d»+s» quark distributions. The result for u(x) is in good agreement with models based on fits to electron and muon scattering data. With u(x) normalized to those models the absolute antiquark momentum distribution x[d»x+s»(x)] in the proton is determined. © 1979 The American Physical Society.