| 1 | // Nsubjettiness Package
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| 2 | // Questions/Comments? jthaler@jthaler.net
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| 3 | //
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| 4 | // Copyright (c) 2011-14
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| 5 | // Jesse Thaler, Ken Van Tilburg, Christopher K. Vermilion, and TJ Wilkason
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| 6 | //
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| 7 | // $Id: WinnerTakeAllRecombiner.hh 670 2014-06-06 01:24:42Z jthaler $
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| 8 | //----------------------------------------------------------------------
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| 9 | // This file is part of FastJet contrib.
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| 10 | //
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| 11 | // It is free software; you can redistribute it and/or modify it under
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| 12 | // the terms of the GNU General Public License as published by the
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| 13 | // Free Software Foundation; either version 2 of the License, or (at
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| 14 | // your option) any later version.
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| 15 | //
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| 16 | // It is distributed in the hope that it will be useful, but WITHOUT
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| 17 | // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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| 18 | // or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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| 19 | // License for more details.
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| 20 | //
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| 21 | // You should have received a copy of the GNU General Public License
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| 22 | // along with this code. If not, see <http://www.gnu.org/licenses/>.
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| 23 | //----------------------------------------------------------------------
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| 24 |
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| 25 | #ifndef __FASTJET_CONTRIB_WINNERTAKEALLRECOMBINER_HH__
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| 26 | #define __FASTJET_CONTRIB_WINNERTAKEALLRECOMBINER_HH__
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| 27 |
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| 28 | #include "fastjet/PseudoJet.hh"
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| 29 | #include "fastjet/JetDefinition.hh"
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| 30 |
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| 31 | #include <cmath>
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| 32 | #include <vector>
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| 33 | #include <list>
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| 34 |
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| 35 | FASTJET_BEGIN_NAMESPACE // defined in fastjet/internal/base.hh
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| 36 |
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| 37 | namespace contrib {
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| 38 |
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| 39 | //------------------------------------------------------------------------
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| 40 | /// \class WinnerTakeAllRecombiner
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| 41 | // WinnerTakeAllRecombiner defines a new recombination scheme by inheriting from JetDefinition::Recombiner.
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| 42 | // This scheme compares the energy of two input particles, and then combines them into a particle with
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| 43 | // an energy equal to the sum of the two particle energies and a direction identical to that of the harder
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| 44 | // particle. This creates a jet with an axis guaranteed to align with a particle in the event.
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| 45 | class WinnerTakeAllRecombiner : public fastjet::JetDefinition::Recombiner {
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| 46 | public:
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| 47 | // Constructor to choose value of alpha (defaulted to 1 for normal pT sum)
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| 48 | WinnerTakeAllRecombiner(double alpha = 1.0) : _alpha(alpha) {}
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| 49 |
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| 50 | virtual std::string description() const;
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| 51 |
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| 52 | /// recombine pa and pb and put result into pab
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| 53 | virtual void recombine(const fastjet::PseudoJet & pa,
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| 54 | const fastjet::PseudoJet & pb,
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| 55 | fastjet::PseudoJet & pab) const;
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| 56 |
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| 57 | private:
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| 58 | double _alpha; //power of (pt/E) term when recombining particles
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| 59 | };
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| 60 |
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| 61 | } //namespace contrib
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| 62 |
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| 63 | FASTJET_END_NAMESPACE
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| 64 |
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| 65 | #endif // __FASTJET_CONTRIB_WINNERTAKEALLRECOMBINER_HH__
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