Nucleon structure functions, F2(x,Q2) and xF3(x,Q2), from ν-Fe scattering at the Fermilab Tevatron

The authors present precision measurements of nucleon structure functions, F2(x,Q2) and xF3(x,Q2) from a sample of 1,320,000 νμ-Fe and 280,000 bar νμ-Fe high-energy charged current interactions at the Fermilab Tevatron. The CCFR measurements of xF3(x,Q2) agree in magnitude but differ in Q2 dependence, at small x, when compared to the CDHSW data; and show for the first time a Q2 evolution consistent with PQCD. The xF3 measurement leads to an accurate determination of the Gross-Llewellyn Smith sum rule. The measurements of F2(x,Q2) agree well with those from SLAC (eN) and BCDMS (μN) experiments, and lead to a precise test of the mean-square charge prediction by the Quark Parton Model. These data, however, differ from the CDHSW (νFe) and EMC (μN) data. Measurements of the scaling violation of the CCFR F2 are also in good agreement with the theory. The preliminary value of ΛMS, from the non-singlet evolution with Q2 > 15 GeV2, is 213 ± 29(stat.) ± 41(syst.) MeV. 25 refs., 13 figs., 4 tabs