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Constants.h
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// -*- 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 {
/**
* The Constants namespace containing some useful physical constants
* with suitable units.
*/
namespace Constants {
using namespace ThePEG::Units;
/** A really large length. */
constexpr Length MaxLength = 1.0e23_mm;
/** A really large energy. */
constexpr Energy MaxEnergy = 1.0e6_GeV;
/** A really large squared energy. */
constexpr Energy2 MaxEnergy2 = MaxEnergy * MaxEnergy;
/** The largest possible double. */
constexpr double MaxDouble = DBL_MAX;
/** A really large double. */
constexpr double HugeDouble = DBL_MAX * 1.0e-4;
/** The largest possible float. */
constexpr double MaxFloat = FLT_MAX;
/** A really large floa.t */
constexpr double HugeFloat = FLT_MAX * 0.01;
/** A really large rapidity */
constexpr double MaxRapidity = 100.0;
/** Good old \f$\pi\f$. */
constexpr double pi = M_PI;
/** Good old \f$2\pi\f$. */
constexpr double twopi = 2.0 * pi;
/** A really large integer */
constexpr long MaxInt = 1000000000L;
/** The smallest non-zero double. */
constexpr double epsilon = DBL_EPSILON;
/** The Euler gamma */
constexpr double EulerGamma = 0.5772156649015329;
/** \f$\zeta(2)\f$. */
constexpr double zeta2 = pi*pi/6.;
/** \f$\zeta(3)\f$. */
constexpr double zeta3 = 1.2020569031595943;
/** \f$\zeta(4)\f$. */
constexpr double zeta4 = 0.4*zeta2*zeta2;
/** \f$\zeta(5)\f$. */
constexpr double zeta5 = 1.0369277551433699;
/** \f$\zeta(6)\f$. */
constexpr double zeta6 = 4.*zeta2*zeta4/7.;
}
}
#endif /* ThePEG_Constants_H */

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