Role of rescattering in pion photoproduction at threshold

Journal Article · Mon Nov 20 04:00:00 EST 1989 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.63.2346· OSTI ID:5017650

Kamal, A N ^[1]

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1. Theoretical Physics Institute and Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2J1 (CA)

It is shown that rescattering corrections to {gamma}{ital p}{r arrow}{pi}{sup 0}p through the sequence {gamma}{ital p}{r arrow}{pi}{sup +}n{r arrow}{pi}{sup 0}p, at threshold, and to {gamma}{ital n}{r arrow}{pi}{sup 0}n through the sequence {gamma}{ital n}{r arrow}{pi}{sup {minus}}p{r arrow}{pi}{sup 0}n, are large. The cusps at {pi}{sup +}n and {pi}{sup {minus}}p thresholds, {ital k}{sub {ital L}}=151.5 and 148.5 MeV, respectively, are inverted. It is also argued that an explanation of the discrepancy between experiment and theory through a {Sigma}-like term is, most likely, erroneous.

• OSTI ID: 5017650
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 63:21; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

645202* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Electromagnetic Interactions & Properties
645204 -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Strong Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BASIC INTERACTIONS
BOSONS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
GAUGE INVARIANCE
HADRONS
INTERACTIONS
INVARIANCE PRINCIPLES
K MATRIX
MATRICES
MESONS
MEV RANGE
MEV RANGE 100-1000
PARTICLE INTERACTIONS
PARTICLE KINEMATICS
PARTICLE PRODUCTION
PCAC THEORY
PHOTON-BARYON INTERACTIONS
PHOTON-HADRON INTERACTIONS
PHOTON-NUCLEON INTERACTIONS
PIONS
PSEUDOSCALAR MESONS
RESCATTERING
SCATTERING