/* 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 0.7 /* 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) */ #define SAT_RHO -2. /* saturation value for rho trajectory */ #define GAMMA_rho .151 /* 0.151 */ /* total width rho */ #define G_rhopipi 6.0444 /* photoprod. model : 6.0444 */ /* pin_pin model : 5.97 */ /* rho-pi-pi coupling */ #define G_RHONN 3.5 /* photoprod. model : 3.5 */ /* pin_pin model : 2.63 */ /* vector coupling constant g_rhonn */ /* with pow(g_rhonn, 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 /* 0.131 */ /* coupling constant g_rho-pi-gamma */ #define G_RHOCPIGA 0.103 /* 0.103 */ /* coupling constant g_rho-pi-gamma */ #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) */ #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 /* 0.314 */ /* coupling constant g_omega-pi-gamma */ /************************************************************************/ /* */ /* 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 */ /************************************************************************/ /* */ /* F1(1285) MESON */ /* */ /************************************************************************/ #define F1_M 1.282 /* f1(1285) mass */ #define G_F1NN 2.5 /* coupling constant f1-N-N */ #define G_F1RHOGA 1.84 #define G_F1PHIGA 0.62 /************************************************************************/ /* */ /* ETA_PRIME (958) MESON */ /* */ /************************************************************************/ #define M_ETAP 0.95777 /* eta_prime meson mass in GeV */ #define G_RHOETAPGA 1.24 /* coupling constant g_rho-etap-gamma */ /* 1.24 */ #define G_OMETAPGA 0.433 /* coupling constant g_omega-etap-gamma */ /* 0.433 */ /************************************************************************/ /* */ /* ETA (547) MESON */ /* */ /************************************************************************/ #define M_ETA 0.5473 /* eta meson mass in GeV */ #define G_RHOETAGA 0.60 /* #define G_RHOETAGA 0.80 */ /* coupling constant g_rho-eta-gamma */ /* 0.80 */ #define G_OMETAGA 0.29 /* coupling constant g_omega-etap-gamma */ /* 0.29 */ /************************************************************************/ /* */ /* NUCLEON */ /* */ /************************************************************************/ /*#define NU_M 0.93827*/ /* nucleon mass in GeV */ #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 M_p33 1.21876 /* delta mass in GeV */ /* 1.21876 relativistic, unitarized background for charged pion channels */ #define ALPHAp_DEL 0.9 /* 0.9 */ #define F_PINDEL 1.949 /* coupling constant f_pindelta */ /* 1.949 unitarized background for charged pion channels */ #define F_PINP33 2.2151 /* given GAMMA_piN of .120 GeV */ #define G_piNp33_off 0. /* off-shell parameter in pindelta coupling */ /* 0.0 */ #define F_RHONDEL 3. /* 3. */ /* rhoNDelta coupling */ #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 M_d13 1.520 /* d13 mass in GeV */ #define ALPHAp_d13 0.9 /* 0.9 */ #define GAMMA_d13tot .120 /* 0.120 */ /* total width d13 */ #define GAMMA_d13piN .073 /* 0.073 */ /* width d13 -> pi N */ #define GAMMAs_d13piDelta .007 /* 0.007 */ /* s-wave width d13 -> pi Delta */ #define GAMMAd_d13piDelta .018 /* 0.018 */ /* d-wave width d13 -> pi Delta */ #define GAMMAs_d13rhoN .026 /* 0.026 */ /* s-wave width d13 -> rho N */ #define F_PINd13 1.58 /* coupling constant f_pind13 */ #define Fs_PIDELd13 .345 /* .345 */ /* s-wave coupling constant fs_pideld13 : positive sign gives positive interference with born terms in pi-delta++ */ #define Fd_PIDELd13 -.207 /* -0.207 */ /* d-wave coupling constant fd_pideld13 : opposite sign of s-wave coupling from angular distributions */ #define F_d13Nrho 2.257 /* 2.257 */ /* d13Nrho coupling */ /* #define G1_d13 5.33 #define G2_d13 5.58 */ #define G1p_d13 5.33 /* 5.33 */ #define G2p_d13 5.58 /* 5.58 */ #define G1n_d13 -0.968 /* -1.508 */ #define G2n_d13 0.656 /* -0.145 */ #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