JetCharge Class Reference

#include <JetCharge.h>

Public Types
typedef reco::Particle::LorentzVector	LorentzVector
enum	Variable {   Pt, RelPt, RelEta, DeltaR,   Unit }
typedef reco::Particle::Vector	Vector

Public Member Functions
double	charge (const LorentzVector &lv, const reco::TrackCollection &vec) const
double	charge (const LorentzVector &lv, const reco::TrackRefVector &vec) const
double	charge (const LorentzVector &lv, const reco::CandidateCollection &vec) const
double	charge (const reco::Candidate &parent) const
	JetCharge (Variable var, double exponent=1.0)
	JetCharge (const edm::ParameterSet &iCfg)

Private Member Functions
template<typename T , typename C >
double	chargeFromRef (const LorentzVector &lv, const C &vec) const
template<typename T , typename C >
double	chargeFromVal (const LorentzVector &lv, const C &vec) const
template<typename T , typename IT >
double	chargeFromValIterator (const LorentzVector &lv, const IT &begin, const IT &end) const
template<class T >
double	getWeight (const LorentzVector &lv, const T &obj) const

Private Attributes
double	exp_
Variable	var_

Detailed Description

Definition at line 18 of file JetCharge.h.

Member Typedef Documentation

typedef reco::Particle::LorentzVector JetCharge::LorentzVector

Definition at line 21 of file JetCharge.h.

typedef reco::Particle::Vector JetCharge::Vector

Definition at line 22 of file JetCharge.h.

Member Enumeration Documentation

enum JetCharge::Variable

Enumerator
Pt
RelPt
RelEta
DeltaR
Unit

Definition at line 20 of file JetCharge.h.

{ Pt, RelPt, RelEta, DeltaR, Unit };

Constructor & Destructor Documentation

JetCharge::JetCharge ( Variable  var, double  exponent = 1.0  )

inline

Definition at line 24 of file JetCharge.h.

References begin, patCaloMETCorrections_cff::C, charge(), chargeFromRef(), chargeFromVal(), chargeFromValIterator(), end, getWeight(), NewMuonAssociatorByHits_cfi::obj, and class-composition::parent.

: var_(var), exp_(exponent) { }

JetCharge::JetCharge

(

const edm::ParameterSet &

iCfg

)

Definition at line 19 of file JetCharge.cc.

References DeltaR, Exception, edm::ParameterSet::getParameter(), Pt, RelEta, RelPt, AlCaHLTBitMon_QueryRunRegistry::string, Unit, JetChargeProducer_cfi::var, and var_.

                                                :
var_(Pt),
exp_(iCfg.getParameter<double>("exp")) {
    std::string var = iCfg.getParameter<std::string>("var");
    if (var == "Pt") {
        var_ = Pt;
    } else if (var == "RelPt") {
        var_ = RelPt;
    } else if (var == "RelEta") {
        var_ = RelEta;
    } else if (var == "DeltaR") {
        var_ = DeltaR;
    } else if (var == "Unit") {
        var_ = Unit;
    } else  {
        throw cms::Exception("Configuration error") << "Unknown variable " 
                        << var.c_str() << " for computing jet charge";
    }
}

Member Function Documentation

double JetCharge::charge	(	const LorentzVector &	lv,
		const reco::TrackCollection &	vec
	)		const

Definition at line 7 of file JetCharge.cc.

Referenced by JetCharge(), and JetChargeProducer::produce().

                                                                                      {
    return chargeFromVal<reco::Track,reco::TrackCollection>(lv, vec);
}

double JetCharge::charge	(	const LorentzVector &	lv,
		const reco::TrackRefVector &	vec
	)		const

Definition at line 11 of file JetCharge.cc.

                                                                                     {
    return chargeFromRef<reco::TrackRef,reco::TrackRefVector>(lv, vec);
}

double JetCharge::charge	(	const LorentzVector &	lv,
		const reco::CandidateCollection &	vec
	)		const

Definition at line 3 of file JetCharge.cc.

                                                                                          {
    return chargeFromVal<reco::Candidate,reco::CandidateCollection>(lv, vec);
}

double JetCharge::charge

(

const reco::Candidate &

parent

)

const

Definition at line 15 of file JetCharge.cc.

References reco::Candidate::begin(), reco::Candidate::end(), and reco::Candidate::p4().

                                                          {
    return chargeFromValIterator<reco::Candidate,reco::Candidate::const_iterator>(parent.p4(),parent.begin(),parent.end()); 
}

template<typename T , typename C >

double JetCharge::chargeFromRef ( const LorentzVector &  lv, const C &  vec  ) const

private

Definition at line 69 of file JetCharge.h.

References end, getWeight(), pileupDistInMC::num, NewMuonAssociatorByHits_cfi::obj, and w.

Referenced by JetCharge().

                                                                           {
    typedef typename C::const_iterator IT;
    double num = 0.0, den = 0.0;
    for (IT it = vec.begin(), end = vec.end(); it != end ; ++it) {
        const T & obj = *it;
        double w = getWeight(lv, *obj);
        den += w;
        num += w * obj->charge();
    }
    return (den > 0.0 ? num/den : 0.0);
}

template<typename T , typename C >

double JetCharge::chargeFromVal ( const LorentzVector &  lv, const C &  vec  ) const

private

Definition at line 63 of file JetCharge.h.

Referenced by JetCharge().

                                                                           {
    typedef typename C::const_iterator IT;
    return JetCharge::chargeFromValIterator<T,IT>(lv, vec.begin(), vec.end());
}

template<typename T , typename IT >

double JetCharge::chargeFromValIterator ( const LorentzVector &  lv, const IT &  begin, const IT &  end  ) const

private

Definition at line 51 of file JetCharge.h.

References end, getWeight(), pileupDistInMC::num, NewMuonAssociatorByHits_cfi::obj, and w.

Referenced by JetCharge().

                                                                                                     {
    double num = 0.0, den = 0.0;
    for (IT it = begin; it != end ; ++it) {
        const T & obj = *it;
        double w = getWeight(lv, obj);
        den += w;
        num += w * obj.charge(); 
    }
    return (den > 0.0 ? num/den : 0.0);
}

template<class T >

double JetCharge::getWeight ( const LorentzVector &  lv, const T &  obj  ) const

private

Definition at line 82 of file JetCharge.h.

References funct::abs(), HiRegitMuonDetachedTripletStep_cff::DeltaR, exp_, cmsBatch::log, funct::pow(), Pt, RelEta, RelPt, mathSSE::sqrt(), Unit, and var_.

Referenced by chargeFromRef(), chargeFromValIterator(), and JetCharge().

                                                                       { 
    double ret;
    switch (var_) {
        case Pt: 
            ret = obj.pt(); 
            break;
        case DeltaR: 
            ret = ROOT::Math::VectorUtil::DeltaR(lv.Vect(), obj.momentum());
            break;
        case RelPt: 
        case RelEta: 
            ret =  lv.Vect().Dot(obj.momentum())/(lv.P() * obj.p()); // cos(theta)
            ret =  (var_ == RelPt ? 
                std::sqrt(1 - ret*ret) * obj.p() :    // p * sin(theta) = pt
            - 0.5 * std::log((1-ret)/(1+ret)));   // = - log tan theta/2 = eta
            break;
        case Unit:
        default:
            ret = 1.0;
    }
    return (exp_ == 1.0 ? ret :  (ret > 0 ? 
                                std::pow(ret,exp_) : 
                                - std::pow(std::abs(ret), exp_)));
}

Member Data Documentation

double JetCharge::exp_

private

Definition at line 46 of file JetCharge.h.

Referenced by getWeight().

Variable JetCharge::var_

private

Definition at line 46 of file JetCharge.h.

Referenced by getWeight(), and JetCharge().