S.J. Sewell

A Comparison of Charged Current Cross Sections and Structure Functions for Neutrino and Antineutrino Beams on Hydrogen and Neon

Abstract Using BEBC equipped with a hydrogen-filled neon-surrounded track-sensitive target, the charged current cross sections and structure functions of hydrogen and neon targets traversed by the same neutrinos and antineutrinos are compared directly. The measured total cross-section ratios between hydrogen and neon allow precise total cross-section values for hydrogen to be inferred. Using this normalization, the ν and ν hydrogen data are combined and the quark distributions in free nucleons, parametrised as functions of ξ, are extracted. This free-nucleon parametrisation is then compared directly with the neon data in order to measure nuclear effects such as those recently reported by the EMC collaboration. Only small effects are seen, in excellent agreement with recent SLAC data in a more similar A and q 2 range.

Limits on neutrino oscillations from a study of νe charged current interactions

Abstract We have fully analysed all events with a single electron obtained in an exposure of BEBC to the 350 GeV wide-band neutrino beam at CERN. The data agrees well with expectations based on the calculated ν e flux and assuming μ−e universality. Using both the rate and the kinematic distributions, improved limits are set on ν e → ν X , ν μ → ν e , ν μ → ν τ mixing.

Cross sections for charged current ν and\(\bar v\) interactions in the energy range 10 to 50 GeV

Charged-current neutrino and antineutrino interaction cross sections have been measured in the energy range 10 to 50 GeV using BEBC filled with a neon-hydrogen mixture. At these energies, σ/E was measured to be (0.73±0.08) 10−38 cm2/GeV per nucleon for neutrinos and (0.32±0.06) 10−38 cm2/GeV per nucleon for antineutrinos.

Cross sections for charged current nu and n

Charged-current neutrino and antineutrino interaction cross sections have been measured in the energy range 10 to 50 GeV using BEBC filled with a neon-hydrogen mixture. At these energies, σ/E was measured to be (0.73±0.08) 10−38 cm2/GeV per nucleon for neutrinos and (0.32±0.06) 10−38 cm2/GeV per nucleon for antineutrinos.

\overline{u}

Abstract A study is presented of dimuon events from an exposure of BEBC to a wide band ν beam from the CERN SPS. These data double the available statistics on ν induced dilepton events observed in bubble chambers. The relative production rate and V0 yield have been measured and found to agree with previous experiments. The analysis of several kinematical variables shows that the gros features of the data agree with the predictions of the GIM model. Some indication exists that part of the signal could be due to quasi elastic production of the “beautiful baryon”, but the statistical significance is too weak to draw definitive conclusions.

interactions in the energy range 10 to 50 GeV

A search for the purely leptonic neutral current process induced by antineutrinos: v μ + e- → v μ + e-, has been performed in the BEBC TST experiment. No contradiction has been observed with the Salam-Weinberg model.

Dimuon events produced in high energy antineutrino interactions observed in BEBC

A search for the purely leptonic neutral current process induced by antineutrinos: v μ + e- → v μ + e-, has been performed in the BEBC TST experiment. No contradiction has been observed with the Salam-Weinberg model.

Upper limit to the cross section for v̄μ + e− → v̄μ + e− at high energy

A search for the purely leptonic neutral current process induced by antineutrinos: v μ + e- → v μ + e-, has been performed in the BEBC TST experiment. No contradiction has been observed with the Salam-Weinberg model.