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ZFinder.cc
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ZFinder.cc
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// -*- C++ -*-
#include "Rivet/Projections/ZFinder.hh"
#include "Rivet/Projections/InvMassFinalState.hh"
#include "Rivet/Projections/ClusteredPhotons.hh"
#include "Rivet/Projections/VetoedFinalState.hh"
#include "Rivet/Tools/ParticleIdUtils.hh"
#include "Rivet/Tools/Logging.hh"
#include "Rivet/Cmp.hh"
namespace Rivet {
ZFinder::ZFinder(const FinalState& fs,
PdgId pid,
double m2_min, double m2_max,
double dRmax) {
_init(fs, pid, m2_min, m2_max, dRmax);
}
ZFinder::ZFinder(double etaMin, double etaMax,
double pTmin,
PdgId pid,
double m2_min, double m2_max,
double dRmax) {
vector<pair<double, double> > etaRanges;
etaRanges += std::make_pair(etaMin, etaMax);
_init(etaRanges, pTmin, pid, m2_min, m2_max, dRmax);
}
ZFinder::ZFinder(const std::vector<std::pair<double, double> >& etaRanges,
double pTmin,
PdgId pid,
double m2_min, const double m2_max,
double dRmax) {
_init(etaRanges, pTmin, pid, m2_min, m2_max, dRmax);
}
void ZFinder::_init(const std::vector<std::pair<double, double> >& etaRanges,
double pTmin, PdgId pid,
double m2_min, double m2_max,
double dRmax) {
FinalState fs(etaRanges, pTmin);
_init(fs, pid, m2_min, m2_max, dRmax);
}
void ZFinder::_init(const FinalState& fs,
PdgId pid,
double m2_min, double m2_max,
double dRmax)
{
setName("ZFinder");
addProjection(fs, "FS");
InvMassFinalState imfs(fs, std::make_pair(pid, -pid), m2_min, m2_max);
addProjection(imfs, "IMFS");
ClusteredPhotons cphotons(FinalState(), imfs, dRmax);
addProjection(cphotons, "CPhotons");
VetoedFinalState remainingFS;
remainingFS.addVetoOnThisFinalState(imfs);
remainingFS.addVetoOnThisFinalState(cphotons);
addProjection(remainingFS, "RFS");
}
/////////////////////////////////////////////////////
const FinalState& ZFinder::remainingFinalState() const
{
return getProjection<FinalState>("RFS");
}
const FinalState& ZFinder::constituentsFinalState() const
{
return getProjection<FinalState>("IMFS");
}
int ZFinder::compare(const Projection& p) const {
PCmp cmp = mkNamedPCmp(p, "IMFS");
if (cmp != EQUIVALENT) return cmp;
cmp = mkNamedPCmp(p, "CPhotons");
if (cmp != EQUIVALENT) return cmp;
return EQUIVALENT;
}
void ZFinder::project(const Event& e) {
_theParticles.clear();
const FinalState& imfs=applyProjection<FinalState>(e, "IMFS");
if (imfs.particles().size() != 2) return;
FourMomentum pZ = imfs.particles()[0].momentum() + imfs.particles()[1].momentum();
const int z3charge = PID::threeCharge(imfs.particles()[0].pdgId()) + PID::threeCharge(imfs.particles()[1].pdgId());
assert(z3charge == 0);
stringstream msg;
msg << "Z reconstructed from: " << endl
<< " " << imfs.particles()[0].momentum() << " " << imfs.particles()[0].pdgId() << endl
<< " + " << imfs.particles()[1].momentum() << " " << imfs.particles()[1].pdgId() << endl;
// Add in clustered photons
const FinalState& photons = applyProjection<FinalState>(e, "CPhotons");
foreach (const Particle& photon, photons.particles()) {
msg << " + " << photon.momentum() << " " << photon.pdgId() << endl;
pZ += photon.momentum();
}
msg << " = " << pZ;
getLog() << Log::DEBUG << msg.str() << endl;
Particle Z;
Z.setMomentum(pZ);
_theParticles.push_back(Z);
getLog() << Log::DEBUG << name() << " found " << _theParticles.size()
<< " particles." << endl;
}
}

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