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 6090 ${\nu }_{\mu }$- 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 $\kappa =0.477{}_{-0.053}^{+0.063}$, where the error includes statistical, systematic and QCD scale uncertainties. In contrast to previous leading order analyses, we find that the strange sea $x$-dependence is similar to that of the non-strange sea, and that the measured charm quark mass, $m_c=1.70\pm 0.19{GeV/c}^2$, is larger and consistent with that determined in other processes. Further analysis finds that the difference in $x$-distributions between $xs(x)$ and $x\bar{s}(x)$ is small. A measurement of the Cabibbo-Kobayashi-Maskawa matrix element $|V_{cd}|=0.232_{-0.020}^{+0.018}$ is also presented. uufile containing compressed postscript files of five Figures is appended at the end of the LaTeX source.

Nevis R#1502

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