| 1 | //FJSTARTHEADER
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| 2 | // $Id: numconsts.hh 4442 2020-05-05 07:50:11Z soyez $
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| 3 | //
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| 4 | // Copyright (c) 2005-2020, Matteo Cacciari, Gavin P. Salam and Gregory Soyez
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| 5 | //
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| 6 | //----------------------------------------------------------------------
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| 7 | // This file is part of FastJet.
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| 8 | //
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| 9 | // FastJet is free software; you can redistribute it and/or modify
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| 10 | // it under the terms of the GNU General Public License as published by
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| 11 | // the Free Software Foundation; either version 2 of the License, or
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| 12 | // (at your option) any later version.
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| 13 | //
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| 14 | // The algorithms that underlie FastJet have required considerable
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| 15 | // development. They are described in the original FastJet paper,
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| 16 | // hep-ph/0512210 and in the manual, arXiv:1111.6097. If you use
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| 17 | // FastJet as part of work towards a scientific publication, please
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| 18 | // quote the version you use and include a citation to the manual and
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| 19 | // optionally also to hep-ph/0512210.
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| 20 | //
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| 21 | // FastJet is distributed in the hope that it will be useful,
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| 22 | // but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 23 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 24 | // GNU General Public License for more details.
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| 25 | //
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| 26 | // You should have received a copy of the GNU General Public License
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| 27 | // along with FastJet. If not, see <http://www.gnu.org/licenses/>.
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| 28 | //----------------------------------------------------------------------
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| 29 | //FJENDHEADER
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| 30 |
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| 31 |
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| 32 |
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| 33 | #ifndef __FASTJET_NUMCONSTS__
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| 34 | #define __FASTJET_NUMCONSTS__
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| 35 |
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| 36 | #include "fastjet/internal/base.hh"
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| 37 |
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| 38 | FASTJET_BEGIN_NAMESPACE // defined in fastjet/internal/base.hh
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| 39 |
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| 40 | // some common useful constants!
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| 41 |
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| 42 | const double pi = 3.141592653589793238462643383279502884197;
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| 43 | const double twopi = 6.283185307179586476925286766559005768394;
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| 44 | const double pisq = 9.869604401089358618834490999876151135314;
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| 45 | const double zeta2 = 1.644934066848226436472415166646025189219;
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| 46 | const double zeta3 = 1.202056903159594285399738161511449990765;
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| 47 | const double eulergamma = 0.577215664901532860606512090082402431042;
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| 48 | const double ln2 = 0.693147180559945309417232121458176568076;
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| 49 |
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| 50 |
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| 51 | FASTJET_END_NAMESPACE
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| 52 |
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| 53 | #endif // __FASTJET_NUMCONSTS__
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