We present production and decay distributions for the reaction vp-~ix m pir + with M^+ p < 1.4 GeV. This reaction is primarily vp-~ii~A ++ 9 but we find evidence for the presence of non-A amplitudes for Q 2 > 1 GeV 2 . The data are fitted by various theoretical models. For Q 2 < 1 GeV 2 the best fit yields the value M A =1.25t §;}| GeV, using a dipole-nucleon axial-vector form factor in Adler's model, although none of these models successfully reproduces the observed A-decay distributions.

Since the beginning of 2002 an intensive measurement program has been performed at the Fermilab Magnet Test Facility (MTF) to understand dynamic effects in Tevatron magnets. Based on the results of this program a new correction algorithm was proposed to compensate for the decay of the sextupole field during the dwell at injection and for the subsequent field "snapback" during the first few seconds of the energy ramp. Beam studies showed that the new correction algorithm works better than the original one, and improves the Tevatron efficiency by at least 3%. The beam studies also indicated insufficient correction during the first 6s of the injection plateau where an unexpected discrepancy of 0.15 sextupole units of extra drift was observed. This paper reports on the most recent measurements of the Tevatron dipoles field at the beginning of the injection plateau. Results on the field decay and snapback in the Tevatron quadrupoles are also presented.

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We present results from the Fermilab 15-ft bubble chamber on the charged-partiele multiplicity distributions produced in high-energy charged-current neutrino-proton interactions. Comparisons are made to yp, ep, up, and inclusive/)/) scattering. The mean hadronic multiplicity (n c ) appears to depend only on the mass of the excited hadronic state, independent of the mode of excitation. A fit to the neutrino data gives (n c ) = (1.09 ± 0.38) + (1.09 ± 0.03) InW 2 .