gamma. production in p sup 20 Ne and pN interactions at 300 GeV

• Published in: Physical review. D, Particles and fields Particles and fields, 1991-05, Vol.43:9
• Main Authors: Yuldashev, B.S., Aliev, S.M., Alimov, M.A., Artykov, K.K., Edgorov, S.O., Inogamov, S.V., Khaneles, A.V., Kosonowski, E.A., Lutpullaev, S.L., Rasulov, N., Rodionova, T.P., Turdaliev, K.T., Turumov, E., Yuldashev, A.A., Loveless, R.J., Reeder, D.D.
• Format: Article
• Language: English
• Subjects: 645103 - High Energy Physics- Particle Interactions & Properties-Experimental- Strong Interactions & Baryon & Meson Properties; 645204 - High Energy Physics- Particle Interactions & Properties-Theoretical- Strong Interactions & Properties; BARYON-BARYON INTERACTIONS; BOSONS; BUBBLE CHAMBERS; COMPOSITE MODELS; DATA; EFFECTIVE MASS; ELEMENTARY PARTICLES; ENERGY RANGE; EVEN-EVEN NUCLEI; EXPERIMENTAL DATA; FRAGMENTATION; GAMMA SPECTRA; GAS TRACK DETECTORS; GEV RANGE; GEV RANGE 100-1000; HADRON-HADRON INTERACTIONS; INCLUSIVE INTERACTIONS; INFORMATION; INTERACTIONS; ISOTOPES; LIE GROUPS; LIGHT NUCLEI; LINEAR MOMENTUM; MASS; MASS SPECTRA; MASSLESS PARTICLES; MATHEMATICAL MODELS; MEASURING INSTRUMENTS; MONTE CARLO METHOD; MULTIPLICITY; NEON 20; NEON ISOTOPES; NUCLEI; NUCLEON-NUCLEON INTERACTIONS; NUMERICAL DATA; PARTICLE INTERACTIONS; PARTICLE MODELS; PARTICLE PRODUCTION; PARTON MODEL; PHOTONS; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; PROTON-NUCLEON INTERACTIONS; QUARK MODEL; RADIATION DETECTORS; RESCATTERING; SCATTERING; SPECTRA; STABLE ISOTOPES; SU GROUPS; SU-3 GROUPS; SYMMETRY GROUPS; TRANSVERSE MOMENTUM
• ISSN: 0556-2821; 1089-4918
• DOI: 10.1103/PhysRevD.43.2803

Data on the multiplicity and inclusive spectra of {gamma} produced in inelastic {ital p} {sup 20}Ne and {ital pN} interactions at 300 GeV are presented. The {gamma} multiplicity for {ital p} {sup 20}Ne interactions is 11.43{plus minus}0.23, and the ratio of {l angle}{ital n}{sub {gamma}}{r angle} for {ital p} {sup 20}Ne and {ital pN} interactions is 1.48{plus minus}0.05. From an analysis of the effective-mass distributions, {l angle}{ital n}{sub {pi}}{sup 0}{r angle}=4.91{plus minus}0.52 and {l angle}{ital n}{sub {eta}}{sup 0}{r angle}=1.47{plus minus}0.33. In fact, {eta}{sup 0} production is much higher in {ital p} {sup 20}Ne interactions ({ital R}({eta}{sup 0}/{pi}{sup 0})=0.66{plus minus}0.12 for {ital n}{sub {ital p}}{ge}2) than in {ital pN} interactions ({ital R}({eta}{sup 0}/{pi}{sup 0}) =0.06{plus minus}0.04). No {eta}{prime}(958) signal is seen. Strong correlations between {l angle}{ital n}{sub {gamma}}{r angle} and {ital n}{sub {ital p}}, the number of secondary protons, are observed, primarily from the central and target fragmentation regions. Inclusive {ital y}{sup *} and {ital p}{sub {perpendicular}} spectra are analyzed and evidence for low-energy cascading and rescattering of fast particles in the projectile fragmentation region is discussed. The data are compared to the predictions of the additive quark model, the Lund model, and the dual parton model.