Search

Multiplicity distributions in various rapidity intervals for charged particles produced in collisions of 360 GeV/c protons with aluminium (Al) and gold (Au) targets are presented. The data were analysed separately for the forward and backward hemispheres. Each distribution is well described by a negative binomial distribution. The experimental distributions are compared with the predictions of the multichain model calculated by the Monte Carlo program MCMHA in which the intranuclear cascade process is included, and also with the Lund Monte Carlo FRITIOF. The results of MCMHA reproduce quite well the multiplicity distributions for various rapidity intervals.

Correlations among identically charged pions were measured for pions produced inp p collisions at 360 GeV/c using the EHS spectrometer. The effective radius for pion production was determined to be 1.02±0.20 fm with a chaoticity factor 0.32±0.08. We attempted to obtain the radii in the directions parallel and perpendicular to the beam axis and found no difference between them. No multiplicity dependence of the radius was observed at this energy. A peak near zero in the four momentum transfer distribution showed significant deviation from a single Gaussian. The results of an analysis of the three like pion enhancement were consistent with those for two pions.

Antilambda production is studied inK−p interactions at 32 GeV/c. Both total and differential cross sections are presented. The inclusive\(\bar \Lambda \) production cross section amounts to 109±7 μb. A remarkable energy dependence is observed, σ(\(\bar \Lambda \)) increasing by a factor of four between 14.3 and 32 GeV/c. Thep⊥2 distribution exhibits an exponential fall-off with a slope of 3.3±0.2 (GeV/c)−2. Most of the\(\bar \Lambda \)'s are emitted in the forward hemisphere. The invariantx distribution increases between 14.3 and 32 GeV/c. Data are presented for\(\bar \Lambda \) production inK-p→Λ\(\bar \Lambda \)+XK-p→\(\bar \Lambda \)Kn+X, andK-p→\(\bar \Lambda \)p+X.

TheSU (6)×O(3) classification of baryons is applied to the hyperon production in the framework of the quark-diquark fusion model. The model predictions are compared with the data measured inpp interactions at various energies. The contribution of the decay of the high-lying hyperon resonances to the observed spectra is estimated and found essential.