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 */