Rivet analyses

title: BRAHMS_2004_CENT_AUAU

BRAHMS AuAu centrality calibration analysis.

Experiment: ()

Status: UNVALIDATED

Authors: - Christian Bierlich

References: - arXiv: 1508.00848 - Eur.Phys.J. C76 (2016) no.4, 199

Beams: * *

Beam energies: ANY

Run details: - Any!

Calibration analysis for BRAHMS AuAu centrality. The centrality number of charged particles at mid-rapidity. No reference yoda file.

Source code:BRAHMS_2004_CENT_AUAU.cc

```c++ // -- C++ --

include "Rivet/Analysis.hh"

include "Rivet/Analyses/RHICCommon.hh"

include "Rivet/Projections/ChargedFinalState.hh"

include "Rivet/Projections/FinalState.hh"

include "Rivet/Projections/ImpactParameterProjection.hh"

include "Rivet/Projections/SingleValueProjection.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief Brahms centrality calibration analysis based on the BrahmsCentrality projection. /// /// No data is given for this analysis, so one MUST do a calibration run. class BRAHMS_2004_CENT_AUAU : public Analysis { public:

// Constructor
BRAHMS_2004_CENT_AUAU()
    : Analysis("BRAHMS_2004_CENT_AUAU") { }


// Initialize the analysis
void init() {
  declare(BRAHMSCentrality(), "Centrality");
  declare(ImpactParameterProjection(), "IMP");

  // The central multiplicity.
  book(mult, "mult", 450, 0, 4500);

  // The impact parameter.
  book(imp, "mult_IMP", 100, 0, 20);
}


// Analyse a single event
void analyze(const Event& event) {
  // Fill impact parameter.
  imp->fill(apply<SingleValueProjection>(event, "IMP")());
  // Fill multiplicity.
  mult->fill(apply<SingleValueProjection>(event, "Centrality")());
}

// Finalize the analysis
void finalize() {
  // Normalize the distributions, safeguarding against
  // yoda normalization error.
  if (mult->numEntries() > 0) mult->normalize();
  if (imp->numEntries() > 0) imp->normalize();
}

private:

// Histograms.
Histo1DPtr mult;
Histo1DPtr imp;

};

RIVET_DECLARE_PLUGIN(BRAHMS_2004_CENT_AUAU);

} ```