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1 | //STARTHEADER |
| 2 | // $Id: numconsts.hh 293 2006-08-17 19:38:38Z salam $ |
| 3 | // |
| 4 | // Copyright (c) 2005-2006, Matteo Cacciari and Gavin Salam |
| 5 | // |
| 6 | //---------------------------------------------------------------------- |
| 7 | // This file is part of FastJet. |
| 8 | // |
| 9 | // FastJet is free software; you can redistribute it and/or modify |
| 10 | // it under the terms of the GNU General Public License as published by |
| 11 | // the Free Software Foundation; either version 2 of the License, or |
| 12 | // (at your option) any later version. |
| 13 | // |
| 14 | // The algorithms that underlie FastJet have required considerable |
| 15 | // development and are described in hep-ph/0512210. If you use |
| 16 | // FastJet as part of work towards a scientific publication, please |
| 17 | // include a citation to the FastJet paper. |
| 18 | // |
| 19 | // FastJet is distributed in the hope that it will be useful, |
| 20 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | // GNU General Public License for more details. |
| 23 | // |
| 24 | // You should have received a copy of the GNU General Public License |
| 25 | // along with FastJet; if not, write to the Free Software |
| 26 | // Foundation, Inc.: |
| 27 | // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 28 | //---------------------------------------------------------------------- |
| 29 | //ENDHEADER |
| 30 | |
| 31 | |
| 32 | |
| 33 | #ifndef __FASTJET_NUMCONSTS__ |
| 34 | #define __FASTJET_NUMCONSTS__ |
| 35 | |
| 36 | #include "fastjet/internal/base.hh" |
| 37 | |
| 38 | namespace fastjet { // defined in fastjet/internal/base.hh |
| 39 | |
| 40 | // some common useful constants! |
| 41 | |
| 42 | const double pi = 3.141592653589793238462643383279502884197; |
| 43 | const double twopi = 6.283185307179586476925286766559005768394; |
| 44 | const double pisq = 9.869604401089358618834490999876151135314; |
| 45 | const double zeta2 = 1.644934066848226436472415166646025189219; |
| 46 | const double zeta3 = 1.202056903159594285399738161511449990765; |
| 47 | const double eulergamma = 0.577215664901532860606512090082402431042; |
| 48 | const double ln2 = 0.693147180559945309417232121458176568076; |
| 49 | |
| 50 | |
| 51 | } // fastjet namespace |
| 52 | |
| 53 | #endif // __FASTJET_NUMCONSTS__ |
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