/* This is the header file that contains the parameters for 
   pion photoproduction at high s. */

#ifndef t_piprod_regge_h
#define t_piprod_regge_h



                          
   

#define ELEC 0.302862     
                          /* electric charge e */
			  /* with pow(e, 2) / (4 * PI) = 1 / 137 */



/************************************************************************/
/*                                                                      */ 
/*                            PION                                      */
/*                                                                      */ 
/************************************************************************/


#define PI_M 0.1396
                          /* pion mass (in GeV) */
                          /* 0.1396 */
#define PI0_M 0.135        
                          /* neutral pion mass (in GeV) */
                          /* 0.135 */
#define PIM_M PI_M


#define ALPHAp_PI 0.75    /* 0.75 (michel), 0.72 */ 

#define SAT_PI -2.        /* saturation value for pion trajectory */


#define F_PINN 1.00265  
                          /* coupling constant f_pinn */
			  /* with pow(f_pinn, 2) / (4 * PI) = 0.08 */
                          /* 1.00265 */ /* 0.97 */     

#define PSPV_PARAM 1      /* 0 = Pseudo-vector coupling */
                          /* 1 = Pseudo-scalar coupling */ 


/************************************************************************/
/*                                                                      */ 
/*                            RHO MESON                                 */
/*                                                                      */ 
/************************************************************************/


#define RHO_M 0.770      
                          /* rho meson mass in GeV */

#define ALPHAp_RHO 0.8    /* 0.8 (michel), 0.88 */ 
#define ALPHAo_RHO 0.55   /* 0.55 (michel), 0.6 */ 

#define SAT_RHO -2.       /* saturation value for rho trajectory */

#define G_RHONN 3.5       /* 3.5 */
                          /*  2.63, 2.5, 3.5 (best fit) */
                          /* vector coupling constant g_rhonn */
			  /* with pow(g_omegann, 2) / (4 * PI) = 0.55 */
                            
#define KAPPA_RHO 6.1     /* 6.1 */
                          /* tensor to vector coupling constant for rho  */
                          /* weak = 3.7, strong = 6.1 (best fit) */ 
#define G_RHONPIGA 0.131
                          /* coupling constant g_rho-pi-gamma */
                          /* 0.131 */
#define G_RHOCPIGA 0.103
                          /* coupling constant g_rho-pi-gamma */
                          /* 0.103 */

#define F_RHO 0.153       /* VDM constant (in GeV-1) of rho-gamma transition */  

/************************************************************************/
/*                                                                      */ 
/*                            OMEGA MESON                               */
/*                                                                      */ 
/************************************************************************/

#define OMEGA_M 0.782      
                          /* omega meson mass in GeV */

#define ALPHAp_OMEGA 0.9  /* 0.82 (michel), 0.92 */ 
#define ALPHAo_OMEGA 0.44   
                           

#define G_OMEGANN 15.     /* 15. */
                          /* coupling constant g_omegann */
			  /* with pow(g_omegann, 2) / (4 * PI) = 24.9 */
                          /* 15.85 (Bonn) */  

#define KAPPA_OMEGA 0.     
                          /* tensor to vector coupling constant for omega  */


#define G_OMPIGA 0.314
                          /* coupling constant g_omega-pi-gamma */
                          /* 0.314 */ 


/************************************************************************/
/*                                                                      */ 
/*                            A1 MESON                                  */
/*                                                                      */ 
/************************************************************************/


#define A1_M 1.230      
                          /* A1 meson mass in GeV */

#define ALPHAp_A1 0.9     /* 0.9 */ 

#define G_A1NN 8.87       /* 8.87 */
                          /* coupling constant g_A1NN */
			  
                            
#define G_A1PIGA 0.32     
                          /* 0.32 in GeV^-1 */
                          /* coupling constant g_A1-pi-gamma */
                          

                                       
/************************************************************************/
/*                                                                      */ 
/*                            NUCLEON                                   */
/*                                                                      */ 
/************************************************************************/

#define NU_M 0.939         /* nucleon mass in GeV */

#define ALPHAp_N 0.97      /* 0.97 */ 

#define P_MAGN 2.79       
                          /* magnetic moment of proton */

#define F1_p 1.
#define F2_p 1.79
                          /* 1.79 */

#define N_MAGN (- 1.91)   
                          /* magnetic moment of neutron */

#define LAM_MNN 1.51        /* 2. */
                          /* cut-off in the M-N-N vertex */

/************************************************************************/
/*                                                                      */ 
/*                            P_33 (1232) RESONANCE                     */
/*                                                                      */ 
/************************************************************************/


#define DEL_M 1.232

#define ALPHAp_DEL 0.9    /* 0.9 */ 

#define M_p33 1.21876
                          /* delta mass in GeV */
                          /* 1.21876 relativistic, unitarized background
                                     for charged pion channels */  

#define F_PINDEL 1.949
                           /* coupling constant f_pindelta */
                           /* 1.949 unitarized background for
                                    charged pion channels */
                           
#define G_piNp33_off 0.  
                          /* off-shell parameter in pindelta coupling */ 
                          /* 0.0 */
                           

#define G1_p33 4.745      /* 4.745 */     
#define G2_p33 5.70       /* 5.70 */     

#define GM_p33 2.80        /* 2.80 */     
#define GE_p33 0.04        /* 0.04 */     

#define KAPPA_DEL 3.0      /* 3. */
                           /* anomalous magnetic moment at the 
                              gamma_delta_delta vertex */

#define LAM_MNDEL 1.51      /* 1.5 */
                           /* cut-off in the M-N-Delta vertex */


/************************************************************************/
/*                                                                      */ 
/*                            D_13 (1520) RESONANCE                     */
/*                                                                      */ 
/************************************************************************/



#define ALPHAp_d13 0.9    /* 0.9 */ 

#define M_d13 1.520
                          /* d13 mass in GeV */
                          
#define F_PINd13 1.58
                          /* coupling constant f_pind13 */
                          
                           
#define G1_d13 5.33       /* 5.33 */     
#define G2_d13 5.58       /* 5.58 */     

#define GMp_d13 -0.314          
#define GEp_d13 -0.721       

#define GMn_d13 0.0889          
#define GEn_d13 0.783       

#define LAM_MNd13 20.      /* 2. */
                          /* cut-off in the M-N-d13 vertex */



/************************************************************************/
/*                                                                      */ 
/*                            ABSORPTION PARAMETERS                     */
/*                                                                      */ 
/************************************************************************/


#define C_ABS 0.7         
                          /* 0.7 for piN system */
                          /* 3.1 for KLambda system */     

#define A_ABS 8.
                          /* 8. for piN system */
                          /* 4. for KLambda system */ 
                          
#define b_ABS 0.01        
                          /* 0.01 for piN system */
                          
                          

#endif