Neutral-current coupling in high-energy neutrino interactions

We present measured hadron energy distributions for the reactions ..nu.. (nu-bar) + N ..-->.. ..nu.. (nu-bar) + hadrons at high energy, as well as for the similar charged-current interactions. Insofar as possible, the determination of these distributions avoids any a priori assumptions about either the neutral-current or the charged-current interactions. We further analyze the neutral-current distributions within the framework of specific models, particularly the scaling model, to obtain a positive-helicity component P = 0.36 +- 0.10, which lies between pure V - A and pure V or A, and a coupling strength of g/sub 0/ = 0.31 +- 0.03 relative to the charged-current interaction. These coupling parameters agree well with the predictions of the Weinberg-Salam model with sin/sup 2/theta/sub W/ = 0.33 +- 0.07.