F.A. Nezrick

Measurement of structure factors in inelastic neutrino scattering

Abstract Neutrino scattering cross-sections in the deep inelastic continuum have been determined and shown to exhibit the point-like behaviour, or scale invariance, previously observed in electroproduction experiments. The structure functions display the features predicted by the Pomeron exchange model for virtual W-scattering. Their magnitudes are compared with various theories.

Single pion production by neutrinos on free protons

Abstract Using a propane bubble chamber the average cross-section for single pion production by neutrinos on free protons has been determined to be (1.13 ± 0.28) × 10 −38 cm 2 for neutrinos of energy between 1 and 4 GeV. The invariant mass distribution of the ( π p) system indicates that N ∗ (1236) production is the dominant process. Angular distributions of the pion in the ( π p) rest frame are also presented. The results of the experiment are compared with theoretical predictions.

UPPER LIMITS FOR DIAGONAL AND NEUTRAL CURRENT COUPLINGS IN THE CERN NEUTRINO EXPERIMENTS.

Abstract The 90% confidence limit for the coupling constant for ν e + e − →e − + ν e is found to be G diagonal G Fermi . Upper limits for two possible neutral current processes are found to be : ( ν μ + p→ ν μ + p)/( ν μ + n→ μ − + p) = 0.12 ± 0.06 and ( ν μ + p→ ν μ + π + + n)/( ν μ + p→ μ − + π + + p) = 0.08 ± 0.04.

A measurement of the ratio of the decay rates K0L → 2γ/K0L → 3 π0

Abstract Using a heavy-liquid bubble chamber, the ratio of the decay rates K 0 L → 2 γ /K 0 L → 3 π 0 has been determined to be (2.5 ± 0.7) × 10 −3 .

Total antineutrino-nucleon charged current cross section in the energy range 10–50 GeV

Abstract The total v μ N charged current cross section in the energy interval 10–50 GeV is unfolded from 15 bubble chamber antineutrino data. The method is to isolate the quasielastic events and determine their relative contribution to the overall charged current sample. The scale parameter is found to be (0.29 ± 0.03) × 10−38 cm2 GeV−1. Relevance of the method for neutrino oscillation studies is discussed.

OBSERVATION OF THE RADIATIVE ELECTRONIC DECAY MODE OF THE LONG-LIVED NEUTRAL K MESON.

Abstract The first observation of the radiative electronic decay of the K L 0 (K L 0 → π eνγ ) is reported, and the results are compared with theoretical models for the decay.

A measurement of the branching ratio of the CP violating decay mode KLo → 2πo

Abstract Using a heavy liquid bubble chamber we have measured the branching ratio (K L o → 2 π o )/(K L o →3 π o ) to be (4.5±1.8) × 10 −3 . Combined with our previously reported measurement of the branching ratio (K L o →3 π o )/(K L o → all modes) we find | η oo | to be (2.2±0.4) × 10 −3 .

A measurement of the branching ratio of the cp violating decay mode k-l-neutral ---> 2 pi-neutral

Abstract Using a heavy liquid bubble chamber we have measured the branching ratio (K L o → 2 π o )/(K L o →3 π o ) to be (4.5±1.8) × 10 −3 . Combined with our previously reported measurement of the branching ratio (K L o →3 π o )/(K L o → all modes) we find | η oo | to be (2.2±0.4) × 10 −3 .