Unitarity cusp in proton Compton scattering
Journal Article
·
· Physical Review, C (Nuclear Physics); (United States)
- Saskatchewan Accelerator Laboratory, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 0W0 (Canada)
Recent proton Compton scattering data from Saskatoon spanning the pion threshold region are shown to reflect the presence of a unitarity cusp (Wigner cusp), long predicted but never before observed. The analysis is based on a formulation of the Compton cross section employing convenient semiphenomenological expressions for the four dominant multipole amplitudes, designed to respect the low energy theorem and other constraints. Unitarity anomalies have now been detected in both the elastic (Compton) and inelastic ([pi][sup 0][ital p]) channels of the [gamma]+[ital p] reaction.
- OSTI ID:
- 6140201
- Journal Information:
- Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 48:4; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
663300 -- Nuclear Reactions & Scattering
General-- (1992-)
663410* -- Photonuclear Reactions & Photon Scattering-- (1992-)
663510 -- Nuclear Mass Ranges-- A=1-5-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BASIC INTERACTIONS
COMPTON EFFECT
CROSS SECTIONS
DATA ANALYSIS
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
INTERACTIONS
LOW-ENERGY THEOREM
PARTICLE INTERACTIONS
PHOTON-BARYON INTERACTIONS
PHOTON-HADRON INTERACTIONS
PHOTON-NUCLEON INTERACTIONS
PHOTON-PROTON INTERACTIONS
SCATTERING
UNITARITY
General-- (1992-)
663410* -- Photonuclear Reactions & Photon Scattering-- (1992-)
663510 -- Nuclear Mass Ranges-- A=1-5-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BASIC INTERACTIONS
COMPTON EFFECT
CROSS SECTIONS
DATA ANALYSIS
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
INTERACTIONS
LOW-ENERGY THEOREM
PARTICLE INTERACTIONS
PHOTON-BARYON INTERACTIONS
PHOTON-HADRON INTERACTIONS
PHOTON-NUCLEON INTERACTIONS
PHOTON-PROTON INTERACTIONS
SCATTERING
UNITARITY