General Formulae of Invariant Functions of the Generalized Reaction γN - γN in the Effective Lagrangians Method
A. Yu. Loginov, V. N. Stibunov
Abstract
The crossed channels of generalized reaction γN - γN have been considered. The transformation coefficients from the independent helicity amplitudes to the invariant functions are calculated. The explicit expressions for invariant functions have been obtained with the subject to the contribution of Born diagrams in s-, u-, and t-channel and six resonances in s- and u-channel. It has been shown that the obtained invariant functions meet the requirements of crossing-symmetry.
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