Baryon-exchange Deck-model contributions to nucleon diffraction dissociation. [Angular distribution, cross sections]

Journal Article · Fri Apr 01 04:00:00 EST 1977 · Phys. Rev., D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.15.1903· OSTI ID:7317004

Cutler, R T; Berger, E L

In a Drell-Deck--model description of high-energy nucleon diffraction dissociation, aN ..-->.. a (N..pi..), we study the contributions which the baryon-exchange and direct-baryon-pole Deck graphs make to the production and decay distributions of the low-mass N..pi.. system. We treat spin effects explicitly. Because the two baryon amplitudes cancel each other to a remarkable degree, their sum has only a small effect (approx.20%) on the overall cross section, which is dominated by the pion-exchange Deck amplitude. Nevertheless, the baryon terms have an important influence on the decay angular distributions of the N..pi.. system, particularly in that region of phase space in which the pion-exchange term is suppressed. They also provide a pronounced increase in the slope of the production-momentum-transfer (t) distribution near the N..pi.. threshold. Both of these results improve the agreement of the unabsorbed Deck model with recent data on NN ..-->.. N (N..pi..) from Fermilab and the CERN ISR. Discrepancies remain in the description of certain correlations between structure in the t distribution and selections on the decay angles. We speculate that this failure suggests the presence of a second non-Deck, perhaps resonant, component in the data and the necessity for a coupled analysis in which final-state interactions are included.

• Research Organization: High Energy Physics Division, Argonne National Laboratory, Argonne, Illinois 60439
• OSTI ID: 7317004
• Journal Information: Phys. Rev., D; (United States), Journal Name: Phys. Rev., D; (United States) Vol. 15:7; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645207* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Strong Interactions
Baryon No. Greater than 1-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BARYON-BARYON INTERACTIONS
BARYON-EXCHANGE MODELS
BOSON-EXCHANGE MODELS
CROSS SECTIONS
DECK EFFECT
DIFFRACTION MODELS
DISTRIBUTION
ELEMENTARY PARTICLES
HADRON-HADRON INTERACTIONS
INTERACTIONS
ISOSPIN
MATHEMATICAL MODELS
NUCLEON-NUCLEON INTERACTIONS
OBE MODEL
OPE MODEL
PARITY
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PROPERTIES
PERIPHERAL MODELS
PROPAGATOR
PROTON-NEUTRON INTERACTIONS
PROTON-NUCLEON INTERACTIONS
S CHANNEL
SPIN
T CHANNEL
VIRTUAL PARTICLES