Evidence for Nonnucleonic Effects in the Threshold Electrodisintegration of the Deuteron at High Momentum Transfer

Abstract

Deuteron electrodisintegration at threshold has been measured between $Q^2=7\mathrm{} \mathrm{and} 28$ ${\mathrm{fm}}^{-2\mathrm{}}$. Nonnucleonic degrees of freedom are essential for the interpretation of the data. In particular, beyond 20 ${\mathrm{fm}}^{-2\mathrm{}}$ the data provide evidence for processes beyond the conventional one-pion exchange.