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HepEntity.h
#ifndef D0RunIIconeJets_HepEntity_class
#define D0RunIIconeJets_HepEntity_class
#include "inline_maths.h"
#include <fastjet/internal/base.hh>
FASTJET_BEGIN_NAMESPACE
namespace d0{
//Author: Lars Sonnenschein 28/Mar/2007
//This is an example class fulfilling the minimal requirements needed by the
//D0 RunII 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
//
// 2009-01-17 Gregory Soyez <soyez@fastjet.fr>
//
// * put the code in the fastjet::d0 namespace
//
// 2007-12-14 Gavin Salam <salam@lpthe.jussieu.fr>
//
// * added an index member
class HepEntity {
public:
HepEntity() {
E=0.;
px=0.;
py=0.;
pz=0.;
index = -1;
return;
}
HepEntity(double E_in, double px_in, double py_in, double pz_in, int index_in = -1) :
E(E_in), px(px_in), py(py_in), pz(pz_in), index(index_in) {
return;
}
HepEntity(const HepEntity& in) : E(in.E), px(in.px), py(in.py), pz(in.pz), index(in.index) {
return;
}
inline double y() const {
return inline_maths::y(E,pz);
}
inline double phi() const {
return inline_maths::phi(px,py);
}
inline double pT() const {
return sqrt(inline_maths::sqr(px)+inline_maths::sqr(py));
}
inline void p4vec(float* p) const {
p[0] = px;
p[1] = py;
p[2] = pz;
p[3] = E;
return;
}
inline void Add(const HepEntity el) {
E += el.E;
px += el.px;
py += el.py;
pz += el.pz;
return;
}
inline void Fill(double E_in, double px_in, double py_in, double pz_in, int index_in = -1) {
E = E_in;
px = px_in;
py = py_in;
pz = pz_in;
index = index_in;
return;
}
double E;
double px;
double py;
double pz;
int index;
private:
};
//end of class HepEntity;
} // namespace d0
FASTJET_END_NAMESPACE
#endif