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// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
#include "Rivet/Tools/Cuts.hh"
#include "Rivet/Projections/SingleValueProjection.hh"
#include "Rivet/Tools/AliceCommon.hh"
#include "Rivet/Projections/AliceCommon.hh"
#include "Rivet/Projections/HepMCHeavyIon.hh"
namespace Rivet {
/// @brief ALICE PbPb at 2.76 TeV multiplicity at mid-rapidity
class ALICE_2010_I880049 : public Analysis {
public :
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ALICE_2010_I880049);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init () {
// Declare centrality projection
declareCentrality(ALICE:: V0MMultiplicity(),
"ALICE_2015_PBPBCentrality" , "V0M" , "V0M" );
// Trigger projections
declare(ChargedFinalState((Cuts:: eta > 2.8 && Cuts:: eta < 5.1 ) &&
Cuts:: pT > 0.1 * GeV), "VZERO1" );
declare(ChargedFinalState((Cuts:: eta > - 3.7 && Cuts:: eta < - 1.7 ) &&
Cuts:: pT > 0.1 * GeV), "VZERO2" );
declare(ChargedFinalState(Cuts:: abseta < 1. && Cuts:: pT > 0.15 * GeV),
"SPD" );
// Charged, primary particles with |eta| < 0.5 and pT > 50 MeV
declare(ALICE:: PrimaryParticles(Cuts:: abseta < 0.5 &&
Cuts:: pT > 50 * MeV && Cuts:: abscharge > 0 ), "APRIM" );
// Access the HepMC heavy ion info
declare(HepMCHeavyIon(), "HepMC" );
// Histograms and variables initialization
book(_histNchVsCentr, 1 , 1 , 1 );
book(_histNpartVsCentr, 1 , 1 , 2 );
}
/// Perform the per-event analysis
void analyze (const Event& event) {
// Charged, primary particles with at least pT = 50 MeV
// in eta range of |eta| < 0.5
Particles chargedParticles =
applyProjection< ALICE:: PrimaryParticles> (event,"APRIM" ).particles();
// Trigger projections
const ChargedFinalState& vz1 =
applyProjection< ChargedFinalState> (event,"VZERO1" );
const ChargedFinalState& vz2 =
applyProjection< ChargedFinalState> (event,"VZERO2" );
const ChargedFinalState& spd =
applyProjection< ChargedFinalState> (event,"SPD" );
int fwdTrig = (vz1.particles().size() > 0 ? 1 : 0 );
int bwdTrig = (vz2.particles().size() > 0 ? 1 : 0 );
int cTrig = (spd.particles().size() > 0 ? 1 : 0 );
if (fwdTrig + bwdTrig + cTrig < 2 ) vetoEvent;
const CentralityProjection& centrProj =
apply< CentralityProjection> (event, "V0M" );
double centr = centrProj();
if (centr > 80 ) vetoEvent;
// Calculate number of charged particles and fill histogram
double nch = chargedParticles.size();
_histNchVsCentr-> fill(centr, nch);
// Attempt to extract Npart form GenEvent.
if (event.genEvent()-> heavy_ion()) {
const HepMCHeavyIon & hi = apply< HepMCHeavyIon> (event, "HepMC" );
_histNpartVsCentr-> fill(centr, hi.Npart_proj() + hi.Npart_targ());
}
}
/// Normalise histograms etc., after the run
//void finalize() { }
//@}
private :
/// @name Histograms
//@{
Profile1DPtr _histNchVsCentr;
Profile1DPtr _histNpartVsCentr;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(ALICE_2010_I880049);
}