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HepEntityI.h
#ifndef D0RunIconeJets_HepEntity_class
#define D0RunIconeJets_HepEntity_class
#include "inline_maths.h"
#include <fastjet/internal/base.hh>
FASTJET_BEGIN_NAMESPACE
namespace d0runi{
//Author: Lars Sonnenschein 15/Sep/2009
//This is an example class fulfilling the minimal requirements needed by the
//D0 RunI cone jet algorithm implementation, which is an inlined template class
// This file is distributed with FastJet under the terms of the GNU
// General Public License (v2). Permission to do so has been granted
// by Lars Sonnenschein and the D0 collaboration (see COPYING for
// details)
//
// History of changes in FastJet compared tothe original version of
// HepEntity.h
//
// 2011-12-13 Gregory Soyez <soyez@fastjet.fr>
//
// * added license information
//
// 2011-11-14 Gregory Soyez <soyez@fastjet.fr>
//
// * removed some harmless warnings coming with the -Wshadow gcc option
//
// 2011-10-06 Gregory Soyez <soyez@fastjet.fr>
//
// * put the code in the fastjet::d0runi namespace
class HepEntityI {
public:
HepEntityI() {
Et=0.;
eta=0.;
phi=0.;
index = -1;
return;
}
HepEntityI(double E_in, double px_in, double py_in, double pz_in,
int index_in = -1) : index(index_in) {
//Snowmass Et scheme
double pt = sqrt(px_in*px_in+py_in*py_in);
double p = sqrt(pt*pt+pz_in*pz_in);
phi = inline_maths::phi(px_in,py_in);
double theta = asin(pt/p);
eta = inline_maths::eta(theta);
Et = E_in*sin(theta);
return;
}
HepEntityI(const HepEntityI& in) : Et(in.Et), eta(in.eta), phi(in.phi), index(in.index) {
return;
}
inline double pT() const {
return Et;
}
inline double px() const {
return Et*cos(phi);
}
inline double py() const {
return Et*sin(phi);
}
inline double pz() const {
return Et*sinh(eta);
}
inline double E() const {
return Et*cosh(eta);
}
inline void p4vec(float* p) const {
p[0] = Et*cos(phi);
p[1] = Et*sin(phi);
p[2] = Et*sinh(eta);
p[3] = Et*cosh(eta); //E
return;
}
inline void Add(const HepEntityI el) {
//assumes Et, eta and phi stored accurately
double w2 = el.Et;
Et += el.Et;
w2 /= Et;
eta += w2*(el.eta - eta);
phi += w2*inline_maths::delta_phi(el.phi, phi);
return;
}
inline void Fill(double E_in, double px_in, double py_in, double pz_in, int index_in) {
double pt = sqrt(px_in*px_in+py_in*py_in);
double p = sqrt(pt*pt+pz_in*pz_in);
phi = inline_maths::phi(px_in,py_in);
double theta = asin(pt/p);
eta = inline_maths::eta(theta);
Et = E_in*sin(theta);
index = index_in;
return;
}
double Et;
double eta;
double phi;
int index;
private:
};
//end of class HepEntityI;
} // end of namespace d0runi
FASTJET_END_NAMESPACE
#endif
fastjet::theta
double theta(const PseudoJet &a, const PseudoJet &b)
returns the angle between a and b
Definition PseudoJet.hh:946