New Charm-Current Effects in Neutrino Scattering

We investigate the quantitative implications for deep inelastic neutrino scattering of a proposed additional $V+A$ charm-changing current $\overline{c}{\gamma }_{\mu }(1-{\gamma }_5)d$. Quark-parton-model spectrum-averaged predictions are compared with available $\nu N$ and $\overline{\nu }N$ $y$ distributions as obtained at Fermilab. Agreement is achieved with an effective charm threshold $W_{\mathrm{th}}=4\mathrm{}$ GeV. A characteristic feature is an enhanced sea contribution that can account for the anomaly in $\frac{d\sigma }{\mathrm{dy}}$ for $\overline{\nu }N$. Predictions for sum rules are significantly changed at high energy.