Rivet analyses

title: ALICE_2015_CENT_PBPB

ALICE centrality calibration for Pb-Pb at 5.02TeV

Experiment: ALICE (LHC)

Status: NEW

Authors: - Christian Holm Christensen

References: none listed

Beams: p+ p+, 1000822080 1000822080

Beam energies: (1380.0, 1380.0); (287040.0, 287040.0); (522392.0, 522392.0)GeV

Run details: - Pb-Pb at sqrt(sNN)=5.02TeV

Dummy analysis to bring in the centrality calibration for Pb-Pb at 5.02TeV

Source code:ALICE_2015_CENT_PBPB.cc

```c++

include "Rivet/Analysis.hh"

include "Rivet/Analyses/AliceCommon.hh"

include "Rivet/Projections/HepMCHeavyIon.hh"

namespace Rivet {

/// Dummy analysis for centrality calibration in Pb-Pb at 5.02TeV /// /// @author Christian Holm Christensen cholm@nbi.dk class ALICE_2015_CENT_PBPB : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ALICE_2015_CENT_PBPB);

/// Initialize this analysis.
void init() {
  ALICE::V0AndTrigger v0and;
  declare<ALICE::V0AndTrigger>(v0and, "V0-AND");

  ALICE::V0MMultiplicity v0m;
  declare<ALICE::V0MMultiplicity>(v0m, "V0M");

  // Access the HepMC heavy ion info
  declare(HepMCHeavyIon(), "HepMC");

  book(_v0m, "V0M", 500, -5.0, 39995.0);
  book(_imp, "V0M_IMP", 100, 0, 20);
}


/// Analyse a single event.
void analyze(const Event& event) {
  // Get and fill in the impact parameter value if the information is valid.
  _imp->fill(apply<HepMCHeavyIon>(event, "HepMC").impact_parameter());

  // Check if we have any hit in either V0-A or -C.  If not, the
  // event is not selected and we get out.
  if (!apply<ALICE::V0AndTrigger>(event, "V0-AND")()) return;

  // Fill in the V0 multiplicity for this event
  _v0m->fill(apply<ALICE::V0MMultiplicity>(event, "V0M")());
}


/// Finalize this analysis
void finalize() {
  _v0m->normalize();
  _imp->normalize();
}

/// The distribution of V0M multiplicity
Histo1DPtr _v0m;
/// The distribution of impact parameters
Histo1DPtr _imp;

};

RIVET_DECLARE_PLUGIN(ALICE_2015_CENT_PBPB);

} ```