We discuss a way to measure the "six-quark" component in the deuteron from a comparison of the structure functions in $\mathrm{ep}$ and $\mathrm{ed}$ deep-inelastic scattering and the structure in $\nu p$ and $\overline{\nu }p$ scattering. Such a determination is obtained by looking at the deviation from 1 in the ratio $T=\frac{d\left(x\right)\mathrm{}\tilde{u}\mathrm{}\left(x\right)\mathrm{}}{u\left(x\right)\mathrm{}\tilde{d}\mathrm{}\left(x\right)\mathrm{}}$, where $u$ and $d$ are the quark distributions determined from $\nu p$ and $\overline{\nu }p$, and $\tilde{u}$ and $\tilde{d}$ are the effective quark distributions determined from $\mathrm{ep}$ and $\mathrm{ed}$ by neglect of coherent six-quark effects.

• Received 10 November 1983

DOI:https://doi.org/10.1103/PhysRevLett.52.1199