Constants.h

// -*- C++ -*-
//
// Constants.h is a part of ThePEG - Toolkit for HEP Event Generation
// Copyright (C) 1999-2019 Leif Lonnblad
//
// ThePEG is licenced under version 3 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef ThePEG_Constants_H
#define ThePEG_Constants_H
 
// This file defines a number of useful constants, placed in the
// namespace <!id>ThePEG::Constants<!!id>.
 
#include "Unitsystem.h"
#include <cmath>
#include <cfloat>
 
namespace ThePEG {
 
namespace Constants {
 
using namespace ThePEG::Units;
 
constexpr Length MaxLength = 1.0e23_mm;
 
constexpr Energy MaxEnergy = 1.0e6_GeV;
 
constexpr Energy2 MaxEnergy2 = MaxEnergy * MaxEnergy;
 
constexpr double MaxDouble = DBL_MAX;
 
constexpr double HugeDouble = DBL_MAX * 1.0e-4;
 
constexpr double MaxFloat = FLT_MAX;
 
constexpr double HugeFloat = FLT_MAX * 0.01;
 
constexpr double MaxRapidity = 100.0;
 
constexpr double pi    = M_PI;
 
constexpr double twopi = 2.0 * pi;
 
constexpr long MaxInt = 1000000000L;
 
constexpr double epsilon = DBL_EPSILON;
 
constexpr double EulerGamma = 0.5772156649015329;
 
constexpr double zeta2 = pi*pi/6.;
 
constexpr double zeta3 = 1.2020569031595943;
 
constexpr double zeta4 = 0.4*zeta2*zeta2;
 
constexpr double zeta5 = 1.0369277551433699;
 
constexpr double zeta6 = 4.*zeta2*zeta4/7.;
}
 
}
 
#endif /* ThePEG_Constants_H */