P. Bloch

Inclusive interactions of high-energy neutrinos and antineutrinos in iron

We present results on charged current inclusive neutrino and antineutrino scattering in the neutrino energy range 30–200 GeV. The results include a) total cross-sections; b)y distributions; c) structure functions; and d) scaling violations observed in the structure functions. The results, as well as their comparison with the results of electron and muon inclusive scattering, are in agreement with the expectations of the quark parton model and QCD.

Neutrino and antineutrino charged-current inclusive scattering in iron in the energy range 20<E v <300 GeV

AbstractInclusive charged-current interactions of high-energy neutrinos and antineutrinos have been studied with high statistics in a counter experiment at the CERN Super Proton Synchrotron. The energy dependence of the total cross-sections, the longitudinal structure function, and the nucleon structure functionsF2,xF3, andn

Comparison of moments from the valence structure function with QCD predictions

bar q^{bar v}

Search for single positive muon production in neutrino interactions

n are determined from these data. The analysis of theQ2-dependence of the structure functions is used to test quantum chromodynamics, to determine the scale parameter Λ and the gluon distribution in the nucleon.

Prompt neutrino production in a proton beam-dump experiment

Abstract The structure functions F 2 ( x , Q 2 ) and xF 3 ( x , Q 2 ) measured in high-energy neutrino charged-current interactions on nuclei are compared with QCD predictions. Solutions to the moment equations of QCD are found which are in good agreement with the data and yield simple parametrisations of the structure functions. For the scale parameter Λ we find Λ = 0.5 ± 0.2 GeV. The analysis also results in values for the width of the gluon distribution as a function of Q 2 . We find 〈 x 〉 gluons = 0.16 ± 0.03 for Q 2 = 10 GeV 2 .

A measurement of the ratio of longitudinal and transverse structure functions in neutrino interactions between 30 and 200 GeV

Abstract We present moments (both ordinary and Nachtmann) of the nucleon valence structure function measured in high Q 2 ν FE scattering, supplemented by data from deep inelastic eD scattering. These data seem to agree with QCD predictions for vector gluons. The QCD parameter Λ is found to be of the order 0.5 GeV.

MEASUREMENT OF THE NEUTRAL TO CHARGED CURRENT CROSS-SECTION RATIOS IN NEUTRINO AND ANTINEUTRINO NUCLEON-INTERACTIONS AND DETERMINATION OF THE WEINBERG ANGLE

Abstract 290 events of the type ν Fe→ μ − μ − X and 53 events from the reaction ν Fe→μ + μ + X with E ν >30 GeV and muon momenta p μ >6.5GeV/ c have been observed in the CDHS detector. After subtracting the background from charged-current processes with one π or K meson of the hadronic shower decaying into μ − ν (or μ + μ) , we obtain for neutrinos a rate of prompt like- sign dimuon production of (3.4±1.8)×10 −5 relative to the rate of charged-current events with the same cuts, or (4.1 ± 2.2)% relative to the prompt μ − μ + rate, and for antineutrinos the corresponding relative rates (4.3±2.3)×10 −5 and (4.2 ± 2.3)%. A possible explanation for the events is charm pair production at a level of 10 −3 relative to all charged-current reactions.

Trimuon events observed in high-energy antineutrino interactions

Abstract A search has been made for neutrino interactions with a positive (wrong-sign) muon in the final state. All the events found can be attributed to known sources. A cut at a visible energy of 100 GeV leaves one event, giving an upper limit for μ + production relative to μ - of 1.6 × 10 −4 at the 90% confidence level. Upper limits are given for (a) charm-changing neutral currents, (b) positive heavy-lepton production, and (c) neutrino-antineutrino oscillations.