Neutrino production of opposite-sign dimuons at Fermilab Tevatron energies

We have measured the strange-quark content of the nucleon, ${\mathrm{\eta }}_{\mathit{s}}$ ${=}_{\mathrm{-}0.08}^{+0.012\mathrm{}}$, and the Kobayashi-Maskawa matrix element ‖${\mathit{V}}_{\mathit{c}\mathit{d}}$‖=0.${220}_{\mathrm{-}0.018}^{+0.015\mathrm{}}$ using a sample of 1797 ${\nu }_{\mathrm{\mu }}$- and ν${\mathrm{¯}}_{\mathrm{\mu }}$-induced ${\mathrm{\mu }}^{\mathrm{-}}$ ${\mathrm{\mu }}^{+}$ events with ${\mathit{P}}_{\mathrm{\mu }}$≥9 GeV/c and 30≤${\mathit{E}}_{\nu }$≤600 GeV. The data are consistent with the slow-rescaling hypothesis of charm production in ν-N scattering and within this formalism yield a value of the charm-quark mass parameter ${\mathit{m}}_{\mathit{c}}$=1.${31}_{\mathrm{-}0.48}^{+0.64\mathrm{}}$ GeV/${\mathit{c}}^2$. .AE