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// Njettiness Package
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// Version 0.4.1 (January 22, 2012)
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// Questions/Comments? jthaler@jthaler.net
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// Copyright (c) 2011-12, Jesse Thaler, Ken Van Tilburg, and Christopher K.
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// Vermilion
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//
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//----------------------------------------------------------------------
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// This file is part of the N-jettiness package ("N-jettiness").
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//
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// N-jettiness is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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//
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// SpartyJet is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with SpartyJet; if not, write to the Free Software
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// Foundation, Inc.:
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//----------------------------------------------------------------------
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#ifndef __NSUBJETTINESS_HH__
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#define __NSUBJETTINESS_HH__
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#include "Njettiness.hh"
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#include "fastjet/FunctionOfPseudoJet.hh"
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#include <string>
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#include <climits>
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#ifndef G__DICTIONARY
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typedef double Double32_t; // ROOT will store as 32-bit, but in code is double
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#endif
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FASTJET_BEGIN_NAMESPACE // defined in fastjet/internal/base.hh
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/// Nsubjettiness extends the concept of Njettiness to a jet shape, but other
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/// than the set of particles considered, they are identical. This class
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/// wraps the core Njettiness code to provide the fastjet::FunctionOfPseudoJet
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/// interface for convenience in larger analyses. See NjettinessPlugin.hh for
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/// definitions of tau_N and the constructor options.
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class Nsubjettiness : public FunctionOfPseudoJet<Double32_t> {
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public:
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Nsubjettiness(int N, Njettiness::AxesMode mode, double beta, double R0, double Rcutoff=std::numeric_limits<double>::max());
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/// returns tau_N, measured on the constituents of this jet
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Double32_t result(const PseudoJet& jet) const;
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private:
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int _N;
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mutable Njettiness _njettinessFinder; // should muck with this so result can be const without this mutable
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};
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inline Nsubjettiness::Nsubjettiness(int N, Njettiness::AxesMode mode, double beta, double R0, double Rcutoff)
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: _N(N), _njettinessFinder(mode, NsubParameters(beta, R0, Rcutoff))
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{}
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inline Double32_t Nsubjettiness::result(const PseudoJet& jet) const
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{
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std::vector<fastjet::PseudoJet> particles = jet.constituents();
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return _njettinessFinder.getTau(_N, particles);
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}
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FASTJET_END_NAMESPACE // defined in fastjet/internal/base.hh
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#endif // __NSUBJETTINESS_HH__
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