V0SvFilter.cc
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V0SvFilter.cc
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	#include "RecoVertex/TertiaryTracksVertexFinder/interface/V0SvFilter.h"

	#include "RecoVertex/VertexPrimitives/interface/TransientVertex.h"
	#include "RecoVertex/TertiaryTracksVertexFinder/interface/VertexMass.h"

	V0SvFilter::V0SvFilter(double massWindow) : theMassWindow(massWindow) ,
	theK0sMass(0.4976)
	{}

	bool V0SvFilter::operator()(const TransientVertex& vtx) const
	{
	VertexMass theVertexMass;

	// only filter if exactly 2 tracks
	if (vtx.originalTracks().size() != 2) return true;

	// filter only if they have opposite charge
	if ( (vtx.originalTracks()[0].charge() * vtx.originalTracks()[1].charge())
	!= -1 ) return true ;

	// filter on mass window
	return (fabs(theVertexMass(vtx)-theK0sMass) > theMassWindow);
	}