Differential cross sections dσ/dy have been measured in semileptonic neutral- and charged-current reactions induced by neutrinos and antineutrinos. The comparison of the neutral- and the charged-current differential cross sections allows the direct determination of the chiral coupling of the neutral neutrino-antineutrino current to left- and right-handed quarks. The result, with a value of g_R^2 = 0.042±0.010, is the first direct determination, with a significance of more than four standard deviations, of a non-zero value of g_R.
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