BeamThrust.hh
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BeamThrust.hh
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	// -- C++ --
	#ifndef RIVET_BeamThrust_HH
	#define RIVET_BeamThrust_HH

	#include "Rivet/Projection.hh"
	#include "Rivet/Projections/FinalState.hh"
	#include "Rivet/Event.hh"

	namespace Rivet {


	class BeamThrust : public Projection {
	public:

	/// Constructor.
	BeamThrust() {}

	BeamThrust(const FinalState& fsp) {
	setName("BeamThrust");
	declare(fsp, "FS");
	}

	/// Clone on the heap.
	DEFAULT_RIVET_PROJ_CLONE(BeamThrust);


	protected:

	/// Perform the projection on the Event
	void project(const Event& e) {
	const vector<Particle> ps
	= applyProjection<FinalState>(e, "FS").particles();
	calc(ps);
	}

	/// Compare projections
	CmpState compare(const Projection& p) const {
	return mkNamedPCmp(p, "FS");
	}


	public:

	double beamthrust() const { return _beamthrust; }

	public:

	/// @name Direct methods
	/// Ways to do the calculation directly, without engaging the caching system
	//@{

	/// Manually calculate the beamthrust, without engaging the caching system
	void calc(const FinalState& fs);

	/// Manually calculate the beamthrust, without engaging the caching system
	void calc(const vector<Particle>& fsparticles);

	/// Manually calculate the beamthrust, without engaging the caching system
	void calc(const vector<FourMomentum>& fsmomenta);

	//@}


	private:

	/// The beamthrust scalar.
	double _beamthrust;

	private:

	/// Explicitly calculate the beamthrust values.
	void _calcBeamThrust(const vector<FourMomentum>& fsmomenta);

	};

	}

	#endif