General Formulas for Invariant Functions Describing Generalized {gamma}N {yields} {gamma}N Reactions within the Method of Effective Lagrangians

The crossed channels of generalized {gamma}N {yields} {gamma}N reactions are considered. The coefficients in the transformation from independent helicity amplitudes to invariant functions are calculated. Explicit expressions for the invariant functions are derived with allowance for the contribution...

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Bibliographic Details
Published in:Physics of atomic nuclei 2005-02, Vol.68 (2)
Main Authors: Loginov, A.Yu, Stibunov, V.N.
Format: Article
Language:English
Subjects:
AMPLITUDES
CROSSING SYMMETRY
HELICITY
LAGRANGIAN FIELD THEORY
LAGRANGIAN FUNCTION
NUCLEONS
PHOTON-NUCLEON INTERACTIONS
PHOTONS
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
QUARK MODEL
RESONANCE PARTICLES
S CHANNEL
T CHANNEL
U CHANNEL
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Summary:The crossed channels of generalized {gamma}N {yields} {gamma}N reactions are considered. The coefficients in the transformation from independent helicity amplitudes to invariant functions are calculated. Explicit expressions for the invariant functions are derived with allowance for the contribution from the Born diagrams in the s, u, and t channels and the diagrams for six resonances in the s and u channels. It is shown that the calculated invariant functions satisfy the crossing-symmetry requirements.
ISSN:1063-7788
1562-692X
DOI:10.1134/1.1866384