fastjet/internal/numconsts.hh

0001 //FJSTARTHEADER
0002 // $Id$
0003 //
0004 // Copyright (c) 2005-2021, Matteo Cacciari, Gavin P. Salam and Gregory Soyez
0005 //
0006 //----------------------------------------------------------------------
0007 // This file is part of FastJet.
0008 //
0009 //  FastJet is free software; you can redistribute it and/or modify
0010 //  it under the terms of the GNU General Public License as published by
0011 //  the Free Software Foundation; either version 2 of the License, or
0012 //  (at your option) any later version.
0013 //
0014 //  The algorithms that underlie FastJet have required considerable
0015 //  development. They are described in the original FastJet paper,
0016 //  hep-ph/0512210 and in the manual, arXiv:1111.6097. If you use
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0028 //----------------------------------------------------------------------
0029 //FJENDHEADER
0030
0031
0032
0033 #ifndef __FASTJET_NUMCONSTS__
0034 #define __FASTJET_NUMCONSTS__
0035
0036 #include "fastjet/internal/base.hh"
0037
0038 FASTJET_BEGIN_NAMESPACE      // defined in fastjet/internal/base.hh
0039
0040 // some common useful constants!
0041
0042 const double pi = 3.141592653589793238462643383279502884197;
0043 const double twopi = 6.283185307179586476925286766559005768394;
0044 const double pisq  = 9.869604401089358618834490999876151135314;
0045 const double zeta2 = 1.644934066848226436472415166646025189219;
0046 const double zeta3 = 1.202056903159594285399738161511449990765;
0047 const double eulergamma = 0.577215664901532860606512090082402431042;
0048 const double ln2   = 0.693147180559945309417232121458176568076;
0049
0050
0051 FASTJET_END_NAMESPACE
0052
0053 #endif // __FASTJET_NUMCONSTS__