Pi0Cut.h

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#ifndef __PI0SELECTOR__H
#define __PI0SELECTOR__H
 
#include "DecayChain/Function/DCSelectionFunction.h"
#include "BesDChain/CDPi0.h"
#include "EvtRecEvent/EvtRecEvent.h"
#include "EvtRecEvent/EvtRecTrack.h"
#include "EvtRecEvent/EvtRecPi0.h"
 
struct UserPi0Cut : public DCSelectionFunction<CDPi0>
{
    UserPi0Cut(double MEBP = 0.025, double MEEP = 0.045,
            double MA = 20.,
            double TL = 25.,
            double MinM = 0.12, double MaxM = 0.15,
            double c = 1e+10)
        : MinEnergyOfBarrelPhoton(MEBP), MinEnergyOfEndcapPhoton(MEEP),
        MinAngle(MA), 
        TimeLimit(TL),
        Chisq(c),
        MinMass(MinM), MaxMass(MaxM)
        {}
 
    double MinEnergyOfBarrelPhoton;
    double MinEnergyOfEndcapPhoton;
    double MinAngle;
    double TimeLimit;
    double MinMass;
    double MaxMass;
    double Chisq;
 
    bool operator()(CDPi0& _this)
    {
        EvtRecTrack* g1 = const_cast<EvtRecTrack*>(_this.navPi0()->hiEnGamma());
        EvtRecTrack* g2 = const_cast<EvtRecTrack*>(_this.navPi0()->loEnGamma());
        if(!isGoodPhoton(g1)) return false;
        if(!isGoodPhoton(g2)) return false;
        if(_this.navPi0()->chisq() > Chisq) return false;
        if(_this.navPi0()->unconMass() < MinMass || _this.navPi0()->unconMass() > MaxMass) return false;
        return true;
    }
 
    bool isGoodPhoton(EvtRecTrack* gTrk)
    {
        if ( !gTrk->isEmcShowerValid() ) return false;
 
        RecEmcShower *emcTrk = gTrk->emcShower();
        //check time
        if(emcTrk->time() > TimeLimit) return false;
        //check energy
        int flag =(emcTrk->cellId() & 0x000F0000) >> 16;
        if ((flag == 1) && emcTrk->energy() < MinEnergyOfBarrelPhoton) return false;
        if ((flag == 0 || flag == 2) && emcTrk->energy() < MinEnergyOfEndcapPhoton) return false;
        //check angle
        Hep3Vector emcpos(emcTrk->x(), emcTrk->y(), emcTrk->z());
        if (recEvt->totalCharged() > 0)
        {
            double dthe = 200.;
            double dphi = 200.;
            double dang1 = 200.;
            for (int j = 0; j < recEvt->totalCharged(); j++) {
                EvtRecTrackIterator jtTrk = recTrkCol->begin() + j;
                if ( !(*jtTrk)->isExtTrackValid() ) continue;
                RecExtTrack* extTrk = (*jtTrk)->extTrack();
                if ( extTrk->emcVolumeNumber() == -1 ) continue;
                Hep3Vector extpos = extTrk->emcPosition();
                double  angd1 = extpos.angle(emcpos);
                double  thed = extpos.theta() - emcpos.theta();
                double  phid = extpos.deltaPhi(emcpos);
                thed = fmod(thed+CLHEP::twopi+CLHEP::twopi+CLHEP::pi, CLHEP::twopi) - CLHEP::pi;
                phid = fmod(phid+CLHEP::twopi+CLHEP::twopi+CLHEP::pi, CLHEP::twopi) - CLHEP::pi;
 
                if ( fabs(thed) < fabs(dthe) ) dthe = thed;
                if ( fabs(phid) < fabs(dphi) ) dphi = phid;
                if ( angd1 < dang1 ) dang1 = angd1;
            }
            if ( dang1 < 200 ) {
                dthe = dthe * 180 / (CLHEP::pi);
                dphi = dphi * 180 / (CLHEP::pi);
                dang1 = dang1 * 180 / (CLHEP::pi);
                if ( dang1 < MinAngle) return false;
 
 
            }  // End of "dang1 < 200" IF 
 
        }  // End of "recEv
        return true;
    }
    public:
    static void SetForTrack(EvtRecEvent* _recEvt, EvtRecTrackCol* _recTrkCol){ recEvt =_recEvt; recTrkCol=_recTrkCol;}
    static EvtRecEvent* recEvt;
    static EvtRecTrackCol* recTrkCol;
};
namespace Pi0{
    extern UserPi0Cut VeryLoosePi0Cut;
    extern UserPi0Cut DefaultPi0Cut;
}
#endif