Rivet analyses

title: ALICE_2015_CENT_PP

ALICE centrality calibration for pp collisions

Experiment: ALICE (LHC)

Status: NEW

Authors: - Christian Holm Christensen

References: none listed

Beams: p+ p+

Beam energies: ANY

Run details: - pp at various energies

Calibration analysis for ALICE pp centrality

Source code:ALICE_2015_CENT_PP.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Analyses/AliceCommon.hh"

include "Rivet/Projections/ImpactParameterProjection.hh"

namespace Rivet {

class ALICE_2015_CENT_PP : public Analysis { public:

RIVET_DEFAULT_ANALYSIS_CTOR(ALICE_2015_CENT_PP);

// Book histograms, initialize projections.
void init() {
  declare(ALICE::V0AndTrigger(), "V0-AND");
  declare(ALICE::V0MMultiplicity(), "V0M");
  declare(ImpactParameterProjection(), "IMP");
  book(_v0m, "V0M", 100, 0, 200);
  book(_imp, "V0M_IMP", 100, 0, 20);
}


// Per-event analysis
void analyze(const Event& event) {
  _imp->fill(apply<SingleValueProjection>(event, "IMP")());

  // 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")());
}


void finalize() {
  _v0m->normalize();
  _imp->normalize();
}


Histo1DPtr _v0m;
Histo1DPtr _imp;

};

RIVET_DECLARE_PLUGIN(ALICE_2015_CENT_PP);

} ```