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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
namespace Rivet {
/// Track-based underlying event at 13 TeV in ATLAS
class ATLAS_2017_I1509919 : public Analysis {
public:
// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ATLAS_2017_I1509919);
// Pre-run histogram and projection booking
void init() {
declare(ChargedFinalState(Cuts::abseta < 2.5 && Cuts::pT > 500*MeV), "CFS500");
// Nch profiles vs. pT_lead
book(_hist_nch[0], 22, 1, 1);
book(_hist_nch[1], 23, 1, 1);
book(_hist_nch[2], 21, 1, 1);
book(_hist_nch[3], 3, 1, 1);
book(_hist_nch[4], 2, 1, 1);
book(_hist_nch[5], 4, 1, 1);
// pTsum profiles vs. pT_lead
book(_hist_ptsum[0], 25, 1, 1);
book(_hist_ptsum[1], 26, 1, 1);
book(_hist_ptsum[2], 24, 1, 1);
book(_hist_ptsum[3], 6, 1, 1);
book(_hist_ptsum[4], 5, 1, 1);
book(_hist_ptsum[5], 7, 1, 1);
// <pT> profiles vs pT_lead (not measured for trans diff)
book(_hist_ptavg[0], 29, 1, 1);
book(_hist_ptavg[1], 30, 1, 1);
book(_hist_ptavg[2], 11, 1, 1);
book(_hist_ptavg[3], 13, 1, 1);
book(_hist_ptavg[4], 12, 1, 1);
// <pT> profiles vs. Nch (not measured for trans diff)
book(_hist_dn_dpt[0], 27, 1, 1);
book(_hist_dn_dpt[1], 28, 1, 1);
book(_hist_dn_dpt[2], 8, 1, 1);
book(_hist_dn_dpt[3], 10, 1, 1);
book(_hist_dn_dpt[4], 9, 1, 1);
// Only measured for trans max/min
book(_hist_dn_dpt2[3], 32, 1, 1);
book(_hist_dn_dpt2[4], 31, 1, 1);
// Nch vs. Delta(phi) profiles
book(_hist_N_vs_dPhi[0], 15, 1, 1);
book(_hist_N_vs_dPhi[1], 16, 1, 1);
book(_hist_N_vs_dPhi[2], 17, 1, 1);
// pT vs. Delta(phi) profiles
book(_hist_pT_vs_dPhi[0], 18, 1, 1);
book(_hist_pT_vs_dPhi[1], 19, 1, 1);
book(_hist_pT_vs_dPhi[2], 20, 1, 1);
//ptLead histos only for 1 and 5 GeV cuts
book(_hist_ptLead[0], 1, 1, 1);
book(_hist_ptLead[1], 14, 1, 1);
for (size_t iC = 0; iC < NCUTS; ++iC) {
book(_counters[iC], "Ctr_cut_" + toString(iC));
}
}
void analyze(const Event& event) {
// Get charged particles (tracks) with pT > 500 MeV
const ChargedFinalState& charged500 = apply<ChargedFinalState>(event, "CFS500");
const Particles& particlesAll = charged500.particlesByPt();
MSG_DEBUG("Num tracks: " << particlesAll.size());
const Cut& pcut = ( (Cuts::abspid != PID::SIGMAMINUS) && (Cuts::abspid != PID::SIGMAPLUS) &&
(Cuts::abspid != PID::XIMINUS) && (Cuts::abspid != PID::OMEGAMINUS) );
const Particles& particles = charged500.particlesByPt(pcut);
MSG_DEBUG("Num tracks without strange baryons: " << particles.size());
// Require at least one track in the event for pTlead histograms
if (particles.empty()) vetoEvent;
for (size_t iC = 0; iC < 2; ++iC) {
if (particles[0].pT() < PTCUTS[iC]*GeV) continue;
_counters[iC]->fill();
_hist_ptLead[iC]->fill( particles[0].pT()/GeV);
}
// Require at least one track in the event with pT >= 1 GeV for the rest
if (particles[0].pT() < 1*GeV) vetoEvent;
// Identify leading track and its phi and pT
const Particle& p_lead = particles[0];
const double philead = p_lead.phi();
const double etalead = p_lead.eta();
const double pTlead = p_lead.perp();
MSG_DEBUG("Leading track: pT = " << pTlead << ", eta = " << etalead << ", phi = " << philead);
// Iterate over all particles and count particles and scalar pTsum in three basic regions
vector<double> num(NREGIONS, 0), ptSum(NREGIONS, 0.0), avgpt(NREGIONS, 0.0);
// Temporary histos that bin Nch and pT in dPhi.
Histo1D hist_num_dphi(*_hist_N_vs_dPhi[0], "/hist_num_dphi");
Histo1D hist_pt_dphi(*_hist_pT_vs_dPhi[0], "/hist_pt_dphi");
hist_num_dphi.reset();
hist_pt_dphi .reset();
int tmpnch[2] = {0,0};
double tmpptsum[2] = {0,0};
for (const Particle& p : particles) {
const double pT = p.pT()/GeV;
const double dPhi = deltaPhi(philead, p.phi()); // in range (0,pi)
const int ir = region_index(dPhi); // gives just toward/away/trans
// Toward/away/trans region: just count
num [ir] += 1;
ptSum[ir] += pT;
// Determine which transverse side
if (ir == kTrans) {
const size_t iside = (mapAngleMPiToPi(p.phi() - philead) > 0) ? 0 : 1;
tmpnch [iside] += 1;
tmpptsum[iside] += p.pT();
}
// Fill temp histos to bin Nch and pT in dPhi
if (p.genParticle() != p_lead.genParticle()) { // We don't want to fill all those zeros from the leading track...
hist_num_dphi.fill(dPhi/M_PI*180);
hist_pt_dphi .fill(dPhi/M_PI*180, pT/GeV);
}
}
// Construct max/min/diff regions
num[kTransMax ] = std::max(tmpnch[0], tmpnch[1]);
num[kTransMin ] = std::min(tmpnch[0], tmpnch[1]);
num[kTransDiff] = num[kTransMax ] - num[kTransMin ];
ptSum[kTransMax ] = std::max(tmpptsum[0], tmpptsum[1]);
ptSum[kTransMin ] = std::min(tmpptsum[0], tmpptsum[1]);
ptSum[kTransDiff] = ptSum[kTransMax ] - ptSum[kTransMin ];
avgpt[kToward] = (num[kToward] > 0 ) ? ptSum[kToward] / num[kToward] : 0. ;
avgpt[kAway] = (num[kAway ] > 0 ) ? ptSum[kAway] / num[kAway] : 0. ;
avgpt[kTrans] = (num[kTrans ] > 0 ) ? ptSum[kTrans] / num[kTrans] : 0. ;
// Avg pt max/min regions determined according sumpt max/min
int sumptMaxRegID = (tmpptsum[0] > tmpptsum[1]) ? 0 : 1 ;
int sumptMinRegID = (sumptMaxRegID == 0) ? 1 : 0;
avgpt[kTransMax ] = (tmpnch[sumptMaxRegID] > 0) ? tmpptsum[sumptMaxRegID] / tmpnch[sumptMaxRegID] : 0.;
avgpt[kTransMin ] = (tmpnch[sumptMinRegID] > 0) ? tmpptsum[sumptMinRegID] / tmpnch[sumptMinRegID] : 0.;
avgpt[kTransDiff] = ((tmpnch[sumptMaxRegID] > 0) && (tmpnch[sumptMinRegID] > 0)) ? avgpt[kTransMax ] - avgpt[kTransMin ] : 0.;
// Now fill underlying event histograms
// The densities are calculated by dividing the UE properties by dEta*dPhi
// -- each basic region has a dPhi of 2*PI/3 and dEta is two times 2.5
// min/max/diff regions are only half of that
const double dEtadPhi[NREGIONS] = { 2*2.5 * 2*PI/3.0, 2*2.5 * 2*PI/3.0, 2*2.5 * 2*PI/3.0,
2*2.5 * PI/3.0, 2*2.5 * PI/3.0, 2*2.5 * PI/3.0 };
for (size_t iR = 0; iR < NREGIONS; ++iR) {
_hist_nch [iR]->fill(pTlead/GeV, num[iR] /dEtadPhi[iR] );
_hist_ptsum[iR]->fill(pTlead/GeV, ptSum[iR] /GeV/dEtadPhi[iR] );
// <pT> profiles vs. pT_lead (first 3 are the same!)
switch (iR) {
case kToward :
case kAway :
case kTrans :
if (num[iR] > 0) _hist_ptavg[iR]->fill(pTlead/GeV, avgpt[iR]/GeV);
break;
case kTransMax :
if (tmpnch[sumptMaxRegID] > 0) _hist_ptavg[iR]->fill(pTlead/GeV, avgpt[iR]/GeV);
break;
case kTransMin :
if (tmpnch[sumptMinRegID] > 0) _hist_ptavg[iR]->fill(pTlead/GeV, avgpt[iR]/GeV);
break;
case kTransDiff :
break;
default: //should not get here!!!
MSG_WARNING("Unknown region in <pT> profiles vs.pt lead switch!!! : " << iR);
}
// <pT> profiles vs. Nch (first 3 are the same!)
switch (iR) {
case kToward :
case kAway :
case kTrans :
if (num[iR] > 0) _hist_dn_dpt[iR]->fill(num[iR] , avgpt[iR]/GeV);
break;
case kTransMax :
if (tmpnch[sumptMaxRegID] > 0) {
_hist_dn_dpt [iR]->fill(num[kTrans] , avgpt[iR]/GeV);
_hist_dn_dpt2[iR]->fill(tmpnch[sumptMaxRegID], avgpt[iR]/GeV);
}
break;
case kTransMin :
if (tmpnch[sumptMinRegID] > 0) {
_hist_dn_dpt [iR]->fill(num[kTrans] , avgpt[iR]/GeV);
_hist_dn_dpt2[iR]->fill(tmpnch[sumptMinRegID], avgpt[iR]/GeV);
}
break;
case kTransDiff :
break;
default : //should not get here!!!
MSG_INFO("unknown region in <pT> profiles vs. nch switch!!! : " << iR);
}
}
// Update the "proper" dphi profile histograms
// Note that we fill dN/dEtadPhi: dEta = 2*2.5, dPhi = 2*PI/nBins
const double dEtadPhi2 = (2*2.5 * 2) * M_PI/180.;
for (size_t i = 0; i < hist_num_dphi.numBins(); ++i) {
// First Nch
double mean = hist_num_dphi.bin(i).xMid() ;
double value = 0.;
if (hist_num_dphi.bin(i).numEntries() > 0) {
mean = hist_num_dphi.bin(i).xMean() ;
value = hist_num_dphi.bin(i).area()/hist_num_dphi.bin(i).xWidth()/dEtadPhi2;
}
for (size_t iC = 0; iC < NCUTS; ++iC) {
if (pTlead >= PTCUTS[iC]*GeV) _hist_N_vs_dPhi[iC] ->fill(mean, value);
}
// Then pT
mean = hist_pt_dphi.bin(i).xMid();
value = 0.;
if (hist_pt_dphi.bin(i).numEntries() > 0) {
mean = hist_pt_dphi.bin(i).xMean() ;
value = hist_pt_dphi.bin(i).area()/hist_pt_dphi.bin(i).xWidth()/dEtadPhi2;
}
for (size_t iC = 0; iC < NCUTS; ++iC) {
if (pTlead >= PTCUTS[iC]*GeV) _hist_pT_vs_dPhi[iC] ->fill(mean, value);
}
}
}
void finalize() {
for (size_t iC = 0; iC < NCUTS; ++iC) {
if (iC == 0 || iC == 1) scale(_hist_ptLead[iC], 1.0/_counters[iC]->sumW());
}
}
private:
enum regionID {
kToward = 0,
kAway,
kTrans,
kTransMax,
kTransMin,
kTransDiff,
NREGIONS
};
// Little helper function to identify basic Delta(phi) regions: toward/away/trans
int region_index(double dphi) {
assert(inRange(dphi, 0.0, PI, CLOSED, CLOSED));
if (dphi < PI/3.0) return kToward;
if (dphi < 2*PI/3.0) return kTrans;
return kAway;
}
const static size_t NCUTS = 3;
const vector<double> PTCUTS = { 1., 5., 10. };
/// @name Histograms
//@{
// Nch, sumpT, avgpT profiles vs. pTlead
Profile1DPtr _hist_nch [NREGIONS]; //for regions: all 6 regions
Profile1DPtr _hist_ptsum [NREGIONS]; //for regions: all 6 regions
Profile1DPtr _hist_ptavg [NREGIONS]; //for regions: trans towards/away/all/min/max
// Nch, sumpT, avgpT profiles vs. Nch
Profile1DPtr _hist_dn_dpt [NREGIONS]; //regions: towards/away/ vs nch(region) & trans all/min/max vs nch(trans)
Profile1DPtr _hist_dn_dpt2[NREGIONS]; //regions: trans min/max vs. nch(region)
Profile1DPtr _hist_N_vs_dPhi [NCUTS];
Profile1DPtr _hist_pT_vs_dPhi[NCUTS];
Histo1DPtr _hist_ptLead[NCUTS]; //for 1,5 GeV cuts only
CounterPtr _counters[NCUTS];
//@}
};
RIVET_DECLARE_PLUGIN(ATLAS_2017_I1509919);
}
|