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 // Header file with global phyiscal constants.

 // Everything is in GeV unless explicitly stated otherwise.

 //

 // Author:       Daniel Winney (2019)

 // Affiliation:  Joint Physics Analysis Center (JPAC)

 // Email:        dwinney@iu.edu

 // ---------------------------------------------------------------------------

 
 #ifndef _DEBUG_
 #define _DEBUG_
 
 #include <iostream>
 #include <iomanip>
 
 namespace jpacPhoto
 {
     // little function for printing to screen instead of having to copy this line all the time

     template<typename T>
     inline void debug(T x)
     {
         std::cout << x << std::endl;
     };
 
     template<typename T, typename F>
     inline void debug(T x, F y)
     {
         std::cout << std::left << std::setw(15) << x;
         std::cout << std::left << std::setw(15) << y << std::endl;
     };
 
     template<typename T, typename F, typename G>
     inline void debug(T x, F y, G z)
     {
         std::cout << std::left << std::setw(15) << x;
         std::cout << std::left << std::setw(15) << y;
         std::cout << std::left << std::setw(15) << z << std::endl;
     };
 };
 
 #endif
 
 #ifndef CONSTANT
 #define CONSTANT
 
 #include <cmath>
 #include <complex>
 
 namespace jpacPhoto
 {
     // ---------------------------------------------------------------------------

     const double PI       = M_PI;
     const double DEG2RAD  = (M_PI / 180.);
     const double EPS      = 1.e-6;
     const double ALPHA    = 1. / 137.;
     const double E        = sqrt(4. * PI * ALPHA);
 
     const std::complex<double> XR(1., 0.);
     const std::complex<double> XI(0., 1.);
     const std::complex<double> IEPS(0., EPS);
 
     // PDG Meson masses in GeV

     const double M_PION      = 0.13957000;
     const double M_KAON      = 0.49367700;
     const double M_ETA       = 0.54753;
     const double M_RHO       = 0.77526;
     const double M_OMEGA     = 0.78265;
     const double M_PHI       = 1.01956;
     const double M_JPSI      = 3.0969160;
     const double M_PSI2S     = 3.686;
     const double M_D         = 1.86965;
     const double M_DSTAR     = 2.01026;
     const double M_UPSILON1S = 9.4603;
     const double M_UPSILON2S = 10.02336;
     const double M_UPSILON3S = 10.3552;
     const double M_CHIC1     = 3.51067;
 
     // Exotic Meson Masses

     const double M_X3872     = 3.87169;
     const double M_Y4260     = 4.220;
     const double M_ZC3900    = 3.8884;
     const double M_ZB10610   = 10.6072;
     const double M_ZB10650   = 10.6522;
 
     // Meson masses squared

     const double M2_PION     = M_PION * M_PION;
     const double M2_JPSI     = M_JPSI * M_JPSI;
     const double M2_D        = M_D * M_D;
     const double M2_DSTAR    = M_DSTAR * M_DSTAR; 
 
     // Baryon masses

     const double M_PROTON    = 0.938272;
     const double M_LAMBDAC   = 2.28646;
 
     // Baryon masses squared

     const double M2_PROTON    = M_PROTON * M_PROTON;
     const double M2_LAMBDAC   = M_LAMBDAC * M_LAMBDAC;
 
     // Decay constants in GeV

     const double F_JPSI      = 0.278;
     const double F_UPSILON1S = 0.23345;
     const double F_UPSILON2S = 0.16563;
     const double F_UPSILON3S = 0.1431;
 
     // Photon lab energy

     inline double E_beam(double W)
     {
         return (W*W / M_PROTON - M_PROTON) / 2.;
     };
 
     // Center of mass energy given beam energy

     inline double W_cm(double egam)
     {
         return sqrt(M_PROTON * (2. * egam + M_PROTON));
     };
 
 };
 // ---------------------------------------------------------------------------

 
 #endif

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