/* This file contains the functions that specify the
   gamma_N_s31 electromagnetic vertex. */

#ifndef gamma_N_s31_vertex_h
#define gamma_N_s31_vertex_h

#include <default.h>
#include <complex.h>
#include <vector.h>
#include <four_vector.h>
#include <t_piprod_parameters.h>


#define G_s31 -0.131     /* -0.131 */    


spinor_mat gamma_N_s31_vertex(int mu, fvec q4);
spinor_mat gamma_s31_N_vertex(int mu, fvec q4);

double form_factor_G_s31(double Q_sqr);


#endif