Determination of the strange quark content of the nucleon from a next-to-leading-order QCD analysis of neutrino charm production

Abstract

We present the first next-to-leading-order QCD analysis of neutrino charm production, using a sample of 6090ν μ − and $$\bar \nu _\mu $$ -induced opposite-sign dimuon events observed in the CCFR detector at the Fermilab Tevatron. We find that the nucleon strange quark content is suppressed with respect to the non-strange sea quarks by a factor κ=0.477 −0.053 +0.063 , where the error includes statistical, systematic and QCD scale uncertainties. In contrast to previous leading order analyses, we find that the strange seax-dependence is similar to that of the non-strange sea, and that the measured charm quark mass,m c =1.70±0.19 GeV/c2, is larger and consistent with that determined in other processes. Further analysis finds that the difference inx-distributions betweenxs(x) and $$x\bar s{\text{(}}x{\text{)}}$$ is small. A measurement of the Cabibbo-Kobayashi-Maskawa matrix element |V cd |=0.232 −0.020 +0.018 is also presented.