Quasiexclusive reactions of neutral-meson production are studied in experiments at the SPHINX facility in the proton beam of the MEP accelerator (E(p) = 70 GeV). The cross sections and the parameters of the differential cross sections for pi(0), omega, and eta production in pN interactions in the deep-fragmentation region (x(F) > 0.79-0.86) are presented. The results of this experiment show that these reactions may be of paramount importance in searches for and study of exotic mesons.

In this paper we discuss inclusive spectra of K0's and Λ's produced in charged in charged-current νμN interactions in the Fermilab 15 ft bubble chamber filled with a 64% Ne-H2 mixture. Data presented in terms of the invariant cross section show, when compared with results from experiments with other incident beams, that the behavior of these distributions is approximately the same. The K0 and Λ fragmentation functions are presented and the shape of the K0 fragmentation function is found to be consistent with the parametrization of Field and Feynman.

The results of a study of gamma production in antineutrino-nucleon interactions observed in the Fermilab 15 ft bubble chamber filled with a neon-hydrogen mixture are presented. From a sample of 706 gamma-rays we obtained the dependence of the average number of produced π0,s on negative multiplicity, momentum transfer and hadronic invariant mass. We find that the mean transverse momentum of the gamma-rays is independent of the above variables but has an asymmetric distribution with respect to the Feynman variablex. The invariant gamma cross-section distributions, the distribution functionD for π0,s and the energy spectrum of π0,s reconstructed from the gamma spectrum are also reported.

We present data on inclusive negative-hadron production from charged-current antineutrino interactions in a 21% Ne-H mixture. Inclusive single-particle distributions are presented and are shown to be insensitive to the momentum transferred to the hadron vertex. Comparisons made to inclusive data from π−p and π−n interactions indicate a close similarity between the hadrons resulting from π-nucleon and ν¯-nucleus interactions. The general features of the ν¯-nucleus data are found to be similar to those seen in ν¯p interactions. This last observation implies that ν¯p and ν¯n interactions are similar and that nuclear effects are small.Received 5 May 1978DOI:https://doi.org/10.1103/PhysRevD.18.3905©1978 American Physical Society