HICaloUtil Class Reference

#include <HICaloUtil.h>

Public Member Functions
	HICaloUtil ()

Static Public Member Functions
static double	EcalEta (const reco::Candidate &p)
static double	EcalEta (double EtaParticle, double Zvertex, double plane_Radius)
static double	EcalPhi (const reco::Candidate &p)
static double	EcalPhi (double PtParticle, double EtaParticle, double PhiParticle, int ChargeParticle, double Rstart)

Static Public Attributes
static const double	kEEtaBarrelEndcap = 1.479
static const double	kER_ECAL = 136.5
static const double	kERBARM = 1.357
static const double	kEZ_Endcap = 328.0
static const double	kEZENDM = 3.186

Detailed Description

Definition at line 15 of file HICaloUtil.h.

Constructor & Destructor Documentation

HICaloUtil::HICaloUtil ( )

inline

Definition at line 17 of file HICaloUtil.h.

{}

Member Function Documentation

double HICaloUtil::EcalEta ( const reco::Candidate &  p )

static

Definition at line 24 of file HICaloUtil.cc.

References reco::Candidate::eta(), mathSSE::sqrt(), and reco::Candidate::vertex().

{  
   // Calculate the eta of the particle wrt the center of the detector.

   double rhovert = sqrt(p.vertex().X()*p.vertex().X()+p.vertex().Y()*p.vertex().Y());
   double zvert   = p.vertex().Z();
   return EcalEta(p.eta(), zvert, rhovert);
}

double HICaloUtil::EcalEta ( double  EtaParticle, double  Zvertex, double  plane_Radius  )

static

Definition at line 35 of file HICaloUtil.cc.

References ETA, fff_deleter::log, PI, and funct::tan().

{  
   // Calculate the eta of the particle wrt center of detector.

   if(EtaParticle != 0.) {
      double Theta = 0.0  ;
      double ZEcal = (kER_ECAL-plane_Radius)*sinh(EtaParticle)+Zvertex;
 
      if(ZEcal != 0.0) Theta = atan(kER_ECAL/ZEcal);
      if(Theta<0.0) Theta = Theta+PI ;
      
      double ETA = - log(tan(0.5*Theta));
 
      if( fabs(ETA) > kEEtaBarrelEndcap )
      {
         double Zend = kEZ_Endcap ;
         if(EtaParticle<0.0 )  Zend = -Zend ;
         double Zlen = Zend - Zvertex ;
         double RR = Zlen/sinh(EtaParticle);
         Theta = atan((RR+plane_Radius)/Zend);
         if(Theta<0.0) Theta = Theta+PI ;
         ETA = - log(tan(0.5*Theta));
      }
                 
      return ETA;
   } 

   return EtaParticle;
}

double HICaloUtil::EcalPhi ( const reco::Candidate &  p )

static

Definition at line 67 of file HICaloUtil.cc.

References reco::Candidate::charge(), reco::Candidate::eta(), phi, reco::Candidate::phi(), reco::Candidate::pt(), mathSSE::sqrt(), and reco::Candidate::vertex().

{  
   // Calculate the phi of the particle transported to the Ecal.

   int charge     = p.charge();
   double phi     = p.phi();
   double rhovert =  sqrt(p.vertex().X()*p.vertex().X()+p.vertex().Y()*p.vertex().Y());
   if(charge) phi   = EcalPhi(p.pt(), p.eta(), phi, charge, rhovert);
   return phi;
}

double HICaloUtil::EcalPhi ( double  PtParticle, double  EtaParticle, double  PhiParticle, int  ChargeParticle, double  Rstart  )

static

Definition at line 80 of file HICaloUtil.cc.

References PHI, and PI.

{
   // Calculate the phi of the particle transported to the Ecal.

   double Rbend = kERBARM-(Rstart/100.); //assumed rstart in cm
   double Bend  = 0.3 * 4. * Rbend/ 2.0 ;
 
   //PHI correction
   double PHI = 0.0 ;
   if( fabs(EtaParticle) <=  kEEtaBarrelEndcap) {
      if (fabs(Bend/PtParticle)<=1.) {
         PHI = PhiParticle - asin(Bend/PtParticle)*ChargeParticle;
         if(PHI >  PI) {PHI = PHI - 2*PI;}
         if(PHI < -PI) {PHI = PHI + 2*PI;}
         return PHI;
      } 
   } else {
      double Rhit = 0.0 ;
      Rhit = kEZENDM / sinh(fabs(EtaParticle));
      if (fabs(((Rhit-(Rstart/100.))/Rbend)*Bend/PtParticle)<=1.) {
         PHI = PhiParticle - asin(((Rhit-(Rstart/100.))/Rbend)*Bend/PtParticle)*ChargeParticle;
         if(PHI >  PI) {PHI = PHI - 2*PI;}
         if(PHI < -PI) {PHI = PHI + 2*PI;}
         return PHI;
      } else {
         return PhiParticle;
      }
   }

   return PhiParticle;
}

Member Data Documentation

const double HICaloUtil::kEEtaBarrelEndcap = 1.479

static

Definition at line 25 of file HICaloUtil.h.

const double HICaloUtil::kER_ECAL = 136.5

static

Definition at line 26 of file HICaloUtil.h.

const double HICaloUtil::kERBARM = 1.357

static

Definition at line 28 of file HICaloUtil.h.

const double HICaloUtil::kEZ_Endcap = 328.0

static

Definition at line 27 of file HICaloUtil.h.

const double HICaloUtil::kEZENDM = 3.186

static

Definition at line 29 of file HICaloUtil.h.