학술논문
π−p interactions at 4.0 GeV/c
Document Type
Article
Author
Bondár, L.; Bongartz, K.; Burmeister, H.; Deutschmann, M.; Keppel, E.; Kraus, G.; Weber, H.; Colley, D. C.; Dodd, W. P.; Simmons, J.; Tallini, B.; Moebes, J.; Nellen, B.; Schlier, Ch.; Dehne, Ch.; Söding, P.; Teucher, M.; Vierk, I.; Wolf, G.; Lohrmann, E.; Brownlee, J. M.; Butterworth, I.; Campayne, F. I.; French, B. R.; Ibbotson, M.; Liu, Y. S.; Sherman, H.; Biswas, N. N.; Derado, I.; Gottstein, K.; Kenney, V. P.; Lüers, D.; Lütjens, G.; Schmitz, N.
Source
Il Nuovo Cimento; February 1964, Vol. 31 Issue: 3 p485-519, 35p
Subject
Language
ISSN
00296341; 18276121
Abstract
A bubble chamber investigation of π−p interactions has been carried out at a momentum of 4 GeV/c. Analysis is limited to 2128 events with four charged secondaries. Cross-sections for the different reactions includingN*++, ρ0and ω production are given. Reactions are discussed in the light of the one-pion-exchange model. TheN*, ρ and ω resonances are found to be produced in peripheral interactions. Possible existence of a dipion resonance at 500 MeV shows up, however no evidence for the production in four-prong events of ABC, ζ or f0resonances could be obtained while the production ofη’s proved to be greatly suppressed due to phase-space limitations. A tentative figure for aT=2 (nonresonant) pion-pion scattering cross-section is given. C.m.s. angular distributions are characterized by a backward going nucleon and one of the pions (in most reactions a negative one) going forward, the rest of the pions being distributed more or less isotropically. With increasing multiplicity the angular distributions become more isotropic and the resonances are smeared out. This fact may be explained by an increasing importance of final-state interactions and by a less peripheral type of production mechanism.