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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
namespace Rivet {
/// @brief ATLAS 13 TeV minimum bias analysis for low-pT tracks
class ATLAS_2016_I1467230 : public Analysis {
public:
/// Particle types included
enum PartTypes {
k_NoStrange,
k_AllCharged,
kNPartTypes
};
/// Phase space regions
enum regionID {
k_pt100_nch2_eta25,
kNregions
};
/// Default constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ATLAS_2016_I1467230);
/// Initialization, called once before running
void init() {
for (int iT = 0; iT < kNPartTypes; ++iT) {
for (int iR = 0; iR < kNregions; ++iR) {
book(_sumW[iT][iR], "_sumW" + to_str(iT) + to_str(iR));
}
}
// Initialize and register projections
declare(ChargedFinalState(Cuts::abseta < 2.5 && Cuts::pT > 100*MeV), "CFS100_25");
for (int iT = 0; iT < kNPartTypes; ++iT) {
for (int iR = 0; iR < kNregions; ++iR) {
book(_hist_nch [iT][iR], 1, iR + 1, iT + 1);
book(_hist_pt [iT][iR], 2, iR + 1, iT + 1);
book(_hist_eta [iT][iR], 3, iR + 1, iT + 1);
book(_hist_ptnch[iT][iR], 4, iR + 1, iT + 1);
}
}
}
/// Fill histograms for the given particle selection and phase-space region
void fillPtEtaNch(const Particles& particles, int ptype, int iRegion) {
// Skip if event fails multiplicity cut
const size_t nch = particles.size();
if (nch < 2) return;
_sumW[ptype][iRegion]->fill();
// Fill nch
_hist_nch[ptype][iRegion]->fill(nch);
// Loop over particles, fill pT, eta and ptnch
for (const Particle& p : particles) {
const double pt = p.pT()/GeV;
const double eta = p.eta();
_hist_pt [ptype][iRegion]->fill(pt , 1.0/pt);
_hist_eta [ptype][iRegion]->fill(eta);
_hist_ptnch[ptype][iRegion]->fill(nch, pt);
}
}
/// Per-event analysis
void analyze(const Event& event) {
// Get all charged particles
const ChargedFinalState& cfs = apply<ChargedFinalState>(event, "CFS100_25");
const Particles& pall = cfs.particles();
// Get charged particles, filtered to omit charged strange baryons
const Cut& pcut = Cuts::abspid != PID::SIGMAMINUS && Cuts::abspid != PID::SIGMAPLUS && Cuts::abspid != PID::XIMINUS && Cuts::abspid != PID::OMEGAMINUS;
const Particles& pnostrange = cfs.particles(pcut);
// Fill all histograms
for (int iR = 0; iR < kNregions; ++iR) {
fillPtEtaNch(pall, k_AllCharged, iR);
fillPtEtaNch(pnostrange, k_NoStrange, iR);
}
}
/// Post-run data manipulation
void finalize() {
// Scale all histograms
for (int iT = 0; iT < kNPartTypes; ++iT) {
for (int iR = 0; iR < kNregions; ++iR) {
if (_sumW[iT][iR]->val() > 0) {
scale(_hist_nch[iT][iR], 1.0/ *_sumW[iT][iR]);
scale(_hist_pt [iT][iR], 1.0/ dbl(*_sumW[iT][iR])/TWOPI/5.);
scale(_hist_eta[iT][iR], 1.0/ *_sumW[iT][iR]);
}
}
}
}
private:
/// Weight sums
CounterPtr _sumW[kNPartTypes][kNregions];
/// @name Histogram arrays
//@{
Histo1DPtr _hist_nch [kNPartTypes][kNregions];
Histo1DPtr _hist_pt [kNPartTypes][kNregions];
Histo1DPtr _hist_eta [kNPartTypes][kNregions];
Profile1DPtr _hist_ptnch [kNPartTypes][kNregions];
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(ATLAS_2016_I1467230);
}
|