Constants.h

/********************************************************************************

    Copyright 2013 Jan Kašpar

    This file is part of Elegent (http://elegent.hepforge.org/).

    Elegent is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Elegent is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Elegent.  If not, see <http://www.gnu.org/licenses/>.
 
********************************************************************************/

#ifndef _elegent_constants_
#define _elegent_constants_

#include "TComplex.h"

namespace Elegent
{

struct Constants
{
    // physics constants
    static double alpha;                    
    static double proton_mass;              
    static double neutron_mass;             
    static double hbarc;                    
    static double sq_hbarc;                 
    static double M;                        
    static double M_sq;                     
    static double kappa;                    
    
    // mathematics constants
    static double pi;                       
    static double gamma;                    

    // physics data
    double sqrt_s;                          
    double s;                               
    double ln_s;                            
    double p_cms;                           
    double sig_fac;                         
    double t_min;                           
    
    enum ParticleMode {mPP, mAPP} pMode;
 
    Constants(double W = 0., ParticleMode mode = mPP)
    {
        Configure(W, mode);
    }
    
    void Configure(double W, ParticleMode mode);

    static void Init(double W, ParticleMode mode);

    void Print();
};


extern TComplex i;
extern Constants *cnts;

} // namespace

#endif