/* This file contains the functions that specify the
   gamma_N_s11 electromagnetic vertex. */

#ifndef gamma_N_s11_vertex_h
#define gamma_N_s11_vertex_h

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


#define Gp_s11 0.212     /* 0.212 */    

#define Gn_s11 -0.07     /* -0.07 */ 


spinor_mat gamma_N_s11_vertex(int iso, int mu, fvec q4);
spinor_mat gamma_s11_N_vertex(int iso, int mu, fvec q4);

double form_factor_G_s11(double Q_sqr);


#endif