Key points are not available for this paper at this time.
We have observed 22 events of the process pp with a background expectation of 8 events. The neutral-current-to-charged-current ratio ({pp) } ({p^+n) } is measured to be 0. 20. 1 for 0. 3<q^2<0. 9 (GeV/c) ^2, where -q^2 is the square of the four-momentum transfer to the proton. When combined with our previous measurement of, this yields a ratio ({p) } () =0. 40. 2, where the error is statistical, suggesting that a purely vector, neutral, hadronic current is unlikely.
Cline et al. (Mon,) studied this question.