Neutral pion photoproduction of the nucleon near threshold

Conference · Sun Jan 01 04:00:00 EST 1989

OSTI ID:5335901

Nozawa, S; Lee, T S.H.; Blankleider, B ^[1]

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1. Argonne National Lab., IL (USA)

Neutral pion photoproduction on the nucleon near threshold is investigated using a dynamical model. It is shown that the commonly used procedure, based on an analytical continuation of the K-matrix to the unphysical region, is not compatible to a dynamical approach. We show that the final state interaction (FSI) amplitude derived from a dynamical model could involve large cancellation between the different pion photoproduction mechanisms. This leads that the FSI due to the intermediate {pi}{sup 0}p state can be as important as that due to the {pi}{sup +}n intermediate state. At threshold, we obtain E{sub 0+} = {minus}1.92 {times} 10{sup {minus}3}/m{sub {pi}+}. This number is close to the measured value of E{sub 0+} = {minus}1.5 {times} 10{sup {minus}3}/m{sub {pi}+}. No violation of the low energy theorem is required to obtain good agreement between the calculated total cross sections and experimental data drum threshold to about 400 MeV incident photon energy. 10 refs., 4 figs., 3 tabs.

• Research Organization: Argonne National Lab., IL (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5335901
• Report Number(s): CONF-8907127-3; ON: DE90002838
• Country of Publication: United States
• Language: English

Related Subjects

645204* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Strong Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
BASIC INTERACTIONS
BOSONS
CALCULATION METHODS
CROSS SECTIONS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
FERMIONS
HADRONS
INTERACTIONS
MATRIX ELEMENTS
MESONS
NUCLEAR REACTIONS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHOTON-BARYON INTERACTIONS
PHOTON-HADRON INTERACTIONS
PHOTON-NUCLEON INTERACTIONS
PHOTONUCLEAR REACTIONS
PHOTOPRODUCTION
PIONS
PIONS NEUTRAL
PSEUDOSCALAR MESONS