/* This header file contains the prototypes of the functions  
   that are needed to describe the relativistic 
   d13 resonance contribution to the pion photoproduction t matrix. */
   
#ifndef t_piprod_d13_rel_h
#define t_piprod_d13_rel_h

#include <default.h>
#include <complex.h>
#include <vector.h>
#include <four_vector.h>
#include <gamma_N_d13_vertex.h>
#include <t_piprod_parameters.h>


double d13_width(double s);

spinor_mat t_s_d13_rel(int iso, int mu, vec p_pi, vec k_ga, vec p_in);
spinor_mat t_u_d13_rel(int iso, int mu, vec p_pi, vec k_ga, vec p_in);



#endif