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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
#include "Rivet/Projections/FastJets.hh"
#include "Rivet/Tools/BinnedHistogram.hh"
namespace Rivet {
/// ATLAS charged particle jet underlying event and jet radius dependence
class ATLAS_2012_I1125575 : public Analysis {
public:
/// @name Constructors etc.
//@{
/// Constructor
ATLAS_2012_I1125575()
: Analysis("ATLAS_2012_I1125575")
{ }
//@}
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
const ChargedFinalState jet_input((Cuts::etaIn(-2.5, 2.5) && Cuts::pT >= 0.5*GeV));
declare(jet_input, "JET_INPUT");
const ChargedFinalState track_input((Cuts::etaIn(-1.5, 1.5) && Cuts::pT >= 0.5*GeV));
declare(track_input, "TRACK_INPUT");
const FastJets jets02(jet_input, FastJets::ANTIKT, 0.2);
declare(jets02, "JETS_02");
const FastJets jets04(jet_input, FastJets::ANTIKT, 0.4);
declare(jets04, "JETS_04");
const FastJets jets06(jet_input, FastJets::ANTIKT, 0.6);
declare(jets06, "JETS_06");
const FastJets jets08(jet_input, FastJets::ANTIKT, 0.8);
declare(jets08, "JETS_08");
const FastJets jets10(jet_input, FastJets::ANTIKT, 1.0);
declare(jets10, "JETS_10");
// Mean number of tracks
initializeProfiles(_h_meanNch, 1);
// Mean of the average track pT in each region
initializeProfiles(_h_meanPtAvg, 2);
// Mean of the scalar sum of track pT in each region
initializeProfiles(_h_meanPtSum, 3);
// Distribution of Nch, in bins of leading track-jet pT
initializeHistograms(_h_Nch, 4);
// Distribution of average track-jet pT, in bins of leading track-jet pT
initializeHistograms(_h_PtAvg, 5);
// Distribution of sum of track-jet pT, in bins of leading track-jet pT
initializeHistograms(_h_PtSum, 6);
for (int i = 0; i < 5; ++i)
book(_nEvents[i], "nEvents_"+to_str(i));
}
void initializeProfiles(Profile1DPtr plots[5][2], int distribution) {
for (int i = 0; i < 5; ++i) {
for (int j = 0; j < 2; ++j) {
book(plots[i][j] ,distribution, i+1, j+1);
}
}
}
void initializeHistograms(BinnedHistogram plots[5][2], int distribution) {
Scatter2D refscatter = refData(1, 1, 1);
for (int i = 0; i < 5; ++i) {
for (int y = 0; y < 2; ++y) {
for (size_t j = 0; j < refscatter.numPoints(); ++j) {
int histogram_number = ((j+1)*2)-((y+1)%2);
double low_edge = refscatter.point(j).xMin();
double high_edge = refscatter.point(j).xMax();
Histo1DPtr tmp;
plots[i][y].add(low_edge, high_edge, book(tmp, distribution, i+1, histogram_number));
}
}
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
vector<Jets*> all_jets;
Jets jets_02 = apply<FastJets>(event, "JETS_02").jetsByPt(Cuts::pT > 4*GeV && Cuts::abseta < 1.5);
all_jets.push_back(&jets_02);
Jets jets_04 = apply<FastJets>(event, "JETS_04").jetsByPt(Cuts::pT > 4*GeV && Cuts::abseta < 1.5);
all_jets.push_back(&jets_04);
Jets jets_06 = apply<FastJets>(event, "JETS_06").jetsByPt(Cuts::pT > 4*GeV && Cuts::abseta < 1.5);
all_jets.push_back(&jets_06);
Jets jets_08 = apply<FastJets>(event, "JETS_08").jetsByPt(Cuts::pT > 4*GeV && Cuts::abseta < 1.5);
all_jets.push_back(&jets_08);
Jets jets_10 = apply<FastJets>(event, "JETS_10").jetsByPt(Cuts::pT > 4*GeV && Cuts::abseta < 1.5);
all_jets.push_back(&jets_10);
// Count the number of tracks in the away and transverse regions, for each set of jets
double n_ch[5][2] = { {0,0}, {0,0}, {0,0}, {0,0}, {0,0} };
// Also add up the sum pT
double sumpt[5][2] = { {0,0}, {0,0}, {0,0}, {0,0}, {0,0} };
// ptmean = sumpt / n_ch
double ptavg[5][2] = { {0,0}, {0,0}, {0,0}, {0,0}, {0,0} };
// lead jet pT defines which bin we want to fill
double lead_jet_pts[5] = {0.0};
// Loop over each of the jet radii:
for (int i = 0; i < 5; ++i) {
if (all_jets[i]->size() < 1) continue;
// Find the lead jet pT
lead_jet_pts[i] = all_jets[i]->at(0).pT();
// Loop over each of the charged particles
const Particles& tracks = apply<ChargedFinalState>(event, "TRACK_INPUT").particlesByPt();
for(const Particle& t : tracks) {
// Get the delta-phi between the track and the leading jet
double dphi = deltaPhi(all_jets[i]->at(0), t);
// Find out which region this puts it in.
// 0 = away region, 1 = transverse region, 2 = toward region
int region = region_index(dphi);
// If the track is in the toward region, ignore it.
if (region == 2) continue;
// Otherwise, increment the relevant counters
++n_ch[i][region];
sumpt[i][region] += t.pT();
}
// Calculate the pT_avg for the away and transverse regions.
// (And make sure we don't try to divide by zero.)
ptavg[i][0] = (n_ch[i][0] == 0 ? 0.0 : sumpt[i][0] / n_ch[i][0]);
ptavg[i][1] = (n_ch[i][1] == 0 ? 0.0 : sumpt[i][1] / n_ch[i][1]);
_nEvents[i]->fill();
}
fillProfiles(_h_meanNch, n_ch, lead_jet_pts, 1.0 / (2*PI));
fillProfiles(_h_meanPtAvg, ptavg, lead_jet_pts, 1.0);
fillProfiles(_h_meanPtSum, sumpt, lead_jet_pts, 1.0 / (2*PI));
fillHistograms(_h_Nch, n_ch, lead_jet_pts);
fillHistograms(_h_PtAvg, ptavg, lead_jet_pts);
fillHistograms(_h_PtSum, sumpt, lead_jet_pts);
}
void fillProfiles(Profile1DPtr plots[5][2], double var[5][2], double lead_pt[5], double scale) {
for (int i=0; i<5; ++i) {
double pt = lead_pt[i];
for (int j=0; j<2; ++j) {
double v = var[i][j];
plots[i][j]->fill(pt, v*scale);
}
}
}
void fillHistograms(BinnedHistogram plots[5][2], double var[5][2], double lead_pt[5]) {
for (int i=0; i<5; ++i) {
double pt = lead_pt[i];
for (int j=0; j<2; ++j) {
double v = var[i][j];
plots[i][j].fill(pt, v);
}
}
}
int region_index(double dphi) {
assert(inRange(dphi, 0.0, PI, CLOSED, CLOSED));
if (dphi < PI/3.0) return 2;
if (dphi < 2*PI/3.0) return 1;
return 0;
}
/// Normalise histograms etc., after the run
void finalize() {
finalizeHistograms(_h_Nch);
finalizeHistograms(_h_PtAvg);
finalizeHistograms(_h_PtSum);
}
void finalizeHistograms(BinnedHistogram plots[5][2]) {
for (int i = 0; i < 5; ++i) {
for (int j = 0; j < 2; ++j) {
vector<Histo1DPtr> histos = plots[i][j].histos();
for(Histo1DPtr h : histos) {
scale(h, 1.0/ *_nEvents[i]);
}
}
}
}
//@}
private:
// Data members like post-cuts event weight counters go here
CounterPtr _nEvents[5];
Profile1DPtr _h_meanNch[5][2];
Profile1DPtr _h_meanPtAvg[5][2];
Profile1DPtr _h_meanPtSum[5][2];
BinnedHistogram _h_Nch[5][2];
BinnedHistogram _h_PtAvg[5][2];
BinnedHistogram _h_PtSum[5][2];
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(ATLAS_2012_I1125575);
}
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