/data/refman/pasoursint/CMSSW_4_1_8_patch13/src/HiggsAnalysis/Skimming/interface/HeavyChHiggsToTauNuSkim.h

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#ifndef HeavyChHiggsToTauNuSkim_h
#define HeavyChHiggsToTauNuSkim_h

// system include files
#include <memory>

// user include files
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/EDFilter.h"

#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/InputTag.h"

#include <math.h>

class HeavyChHiggsToTauNuSkim : public edm::EDFilter {

    public:
        explicit HeavyChHiggsToTauNuSkim(const edm::ParameterSet&);
        ~HeavyChHiggsToTauNuSkim();

        virtual bool filter(edm::Event&, const edm::EventSetup& );

   private:
        double deltaPhi(double phi1, double phi2){
            const double PI = 3.1415926535;     
            // in ORCA phi = [0,2pi], in TLorentzVector phi = [-pi,pi].
            // With the conversion below deltaPhi works ok despite the
            // 2*pi difference in phi definitions.
            if(phi1 < 0) phi1 += 2*PI;
            if(phi2 < 0) phi2 += 2*PI;
        
            double dphi = fabs(phi1-phi2);
        
            if(dphi > PI) dphi = 2*PI - dphi;
            return dphi;
        }

        double deltaR(double eta1, double eta2, double phi1, double phi2){
            double dphi = deltaPhi(phi1,phi2);
            double deta = fabs(eta1-eta2);
            return sqrt(dphi*dphi + deta*deta);
        }

        bool            debug;

        edm::InputTag   hltTauLabel;
        edm::InputTag   jetLabel;
        int             minNumberOfjets;
        double          jetEtMin;
        double          jetEtaMin;
        double          jetEtaMax;
        double          minDRFromTau;

        int nEvents, nSelectedEvents;
};
#endif