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CommonTools
CandUtils
src
helicityAngle.cc
Go to the documentation of this file.
1
// $Id: helicityAngle.cc,v 1.1 2009/02/26 09:17:35 llista Exp $
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#include "
CommonTools/CandUtils/interface/helicityAngle.h
"
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#include "
DataFormats/Candidate/interface/Candidate.h
"
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#include "
CommonTools/CandUtils/interface/Booster.h
"
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#include <Math/VectorUtil.h>
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using namespace
reco
;
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using namespace
std;
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double
helicityAngle
(
const
reco::Candidate
& mother,
const
reco::Candidate
& daughter) {
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Particle::Vector
boost = mother.
p4
().BoostToCM();
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Particle::LorentzVector
pdau = ROOT::Math::VectorUtil::boost( daughter.
p4
(), boost );
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double
h
= ROOT::Math::VectorUtil::Angle( pdau, boost );
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if
( h >
M_PI
/ 2 ) h =
M_PI
-
h
;
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return
h
;
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}
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double
helicityAngle
(
const
Candidate
& cand ) {
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assert( cand.
numberOfDaughters
() == 2 );
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return
helicityAngle
( cand, *cand.
daughter
(0) );
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}
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reco::Candidate::daughter
virtual const Candidate * daughter(size_type i) const =0
return daughter at a given position, i = 0, ... numberOfDaughters() - 1 (read only mode) ...
reco::Candidate
Definition:
Candidate.h:29
dt_dqm_sourceclient_common_cff.reco
tuple reco
Definition:
dt_dqm_sourceclient_common_cff.py:105
Candidate.h
reco::Candidate::numberOfDaughters
virtual size_type numberOfDaughters() const =0
number of daughters
helicityAngle.h
Booster.h
M_PI
#define M_PI
Definition:
BFit3D.cc:3
h
The Signals That Services Can Subscribe To This is based on ActivityRegistry h
Helper function to determine trigger accepts.
Definition:
Activities.doc:4
reco::Particle::Vector
math::XYZVector Vector
point in the space
Definition:
Particle.h:31
reco::Particle::LorentzVector
math::XYZTLorentzVector LorentzVector
Lorentz vector.
Definition:
Particle.h:25
helicityAngle
double helicityAngle(const reco::Candidate &mother, const reco::Candidate &daughter)
return the helicity angle for two particles.
Definition:
helicityAngle.cc:9
reco::Candidate::p4
virtual const LorentzVector & p4() const =0
four-momentum Lorentz vector
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