ar X iv : h ep - p h / 03 11 06 4 v 1 5 N ov 2 00 3 Neutrino Charm Production and Implications for PDF ’ s ∗ †

We have performed the first comprehensive global QCD analysis including the CCFR and NuTeV di-muon data; this data provides strong constraints on the strange quark PDF. Introduction The recent measurements of both neutrino and anti-neutrino production of charm (as di-muon final states) by the CCFR and NuTeV collaborations provide important new information on the strange quark distribution, s(x), of the nucleon.[1, 2] We report here the first comprehensive global QCD analysis that includes the CCFR and NuTeV di-muon data. In previous global analyses, the predominant information on s came from the difference of (large) inclusive cross sections for neutral and charged current DIS; hence, the comparably small s and s̄ distributions extracted had large uncertainties. Lacking better information, these studies often assumed the distribution was of the form s(x) = s̄(x) ∼ κ(ū + d̄)/2 with κ ∼ 0.5. The recent The work presented here is performed in collaboration with S. Kretzer, P. Nadolsky, W.K. Tung J.F. Owens, S. Kuhlmann, J. Pumplin, D. Stump, M.H. Reno, J. Huston, & H. L. Lai. To appear in the proceedings of 11th International Workshop on Deep Inelastic Scattering (DIS 2003), St. Petersburg, Russia, 23-27 Apr 2003.