A. Klovning

STRUCTURE IN THE ANGULAR DISTRIBUTION OF HIGH ENERGY PROTON--PROTON SCATTERING.

Abstract Results are presented on measurements of elastic proton-proton scattering at 19.2 and 21.1 GeV/c in the angular region where previously structure had been observed at lower energies.

Proton proton elastic scattering and nucleon resonance production at high-energies

Abstract Angular distributions of proton-proton elastic scattering have been measured for incident beam momenta of 10.0, 12.0, 14.2 and 24.0 GeV/ c over a range of lab scattering angles from 12 to 152 mrad. This is equivalent to a range of four-momentum transfer squared from about 0.1 to 6.7 GeV 2 at the highest momentum. Nucleon resonance production in the two-body reaction p + p → p + X has been studied at 24.0 GeV/ c incident momentum from 13.5 to 112 mrad by measuring the proton momentum spectra from the elastic peak down to a momentum corresponding to a missing mass of about 2.6 GeV. The new data are compared with previous results and theoretical models.

DISCONTINUOUS BEHAVIOUR IN LARGE ANGLE PROTON--PROTON ELASTIC SCATTERING AT HIGH ENERGIES.

Abstract Measurements of elastic proton-proton differential cross sections for angles between 65° and 90° c.m.s. have been made at 8, 9, 10, 11, 14, 15 and 21 GeV/c. The shape of the angular distribution is found to change suddenly between 8 and 11 GeV/c. An interpretation of this discontinuous behaviour in terms of the reactive effects of baryon-antibaryon pair production is proposed.

Evidence for dominant vector-meson production in inelastic proton-proton collisions at 53 GeV c.m. energy

Abstract The Split Field Magnet facility at the CERN ISR has been used to measure inclusive resonance production in inelastic p-p collisions at a c.m. energy of 53 GeV. The mass spectrum of pairs of oppositely charged hadrons shows a strong correlation, which can be explained as a consequence of dominant vector meson production, accounting for more than 60% of all pions and kaons produced.

DIFFRACTION-LIKE STRUCTURE IN ELASTIC PROTON--PROTON SCATTERING AT LARGE MOMENTUM TRANSFERS.

Abstract Measurements of wide angle elastic p-p scattering between 7 and 12 GeV/ c are reported. Structure found in the angular distributions is suggestive of diffraction.

Energy dependence of the structure in high energy proton-proton elastic scattering

Abstract The angular distribution of proton-proton elastic scattering has been measured for incident beam momenta of 10.0, 12.0, 14.2 and 24.0 GeV/c over a range of laboratory scattering angles from 12 to about 140 mrad. The results are compared with the fourth power of the electromagnetic form of the proton.

Momentum transfer dependence of nucleon resonance production in proton-proton collisions at 24 GeV/c

Abstract Nucleon resonance production in the two-body reaction p + p → p + N ∗ has been studied at 24 GeV/ c incident momentum for angles from 12 to 117 mrad by measuring proton momentum spectra from the elastic peak down to a momentum corresponding to a missing mass of about 2.6 GeV.

Differential cross sections for the reactions p + p → D + π+ and p + p → D + ϱ+ at 21 GeV/c

Abstract Results are presented from an experiment in which high-energy deuterons, produced by proton-proton interactions at 21.1 GeV/ c incident momentum, were detected over a range of angles from 12.5 mrad to 60 mrad in the laboratory system. From the momentum spectra of the deuterons, the final states D + π + and D + ϱ + have been identified. The angular distribution for these reactions are presented and compared with previous data at lower energies.

Momentum spectra of secondary particles produced in proton--proton collisions at 14.2, 19.2, and 24.0 GeV/c

Results on charged particle yields in proton-proton collisions at 14.2, 19.2 and 24.0 GeV/c for secondary momenta above 4 GeV/c and lab angles between 10 and 150 mrad are reported. Cross sections for inclusive reactions involving the production of π± K±, p and p are presented. The general features of the dependence of the data on transverse and longitudinal momentum, missing mass, and four-momentum transfer are described and the approach to limiting distributions in the 10 to 30 GeV energy range is discussed.

On the separation of single and double scattering in proton-deuteron collisions at 19.2 GeV/c

Abstract Experimental data exhibiting the separation of single and double quasi-elastic scattering in proton-deuteron collisions at 19.2 GeV/ c and for momentum transfers around 1 GeV/ c are presented. An analysis of the scattering cross section in terms of the multiple scattering theory is given. The possibilities for the deduction of proton-neutron differential cross sections particularly at large momentum transfers are pointed out.