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## Rivet analyses reference

### ALICE_2015_PPBCentrality

Experiment: ()
Status: UNVALIDATED
Authors:
• Christian Bierlich
References:
• Phys.Lett.B728(2014)25-38,arXiv:1307.6796
Beams: * *
Beam energies: ANY
Run details:
• Any!

Calibration analysis for ALICE pPb centrality. The centrality measure is multiplicity in VO-A ie. in the lead direction. No reference data is given, as the spectrum is not possible to unfold.

Source code: ALICE_2015_PPBCentrality.cc
  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 // -*- C++ -*- #include "Rivet/Projections/ImpactParameterProjection.hh" #include "Rivet/Analysis.hh" #include "Rivet/Projections/AliceCommon.hh" namespace Rivet { /// Generic analysis looking at various distributions of final state particles class ALICE_2015_PPBCentrality : public Analysis { public: DEFAULT_RIVET_ANALYSIS_CTOR(ALICE_2015_PPBCentrality); /// Book histograms and initialise projections before the run void init() { // One projection for the actual observable, and one for the // generated impact parameter. declare(ALICE::V0AMultiplicity(), "V0A"); declare(ImpactParameterProjection(), "IMP"); declare(ALICE::V0AndTrigger(), "Trigger"); // The calibration histogram: book(_calib, "V0A", 100, 0.0, 500.0); // The alternative histogram based on impact parameter. Note that // it MUST be named the same as the histogram for the experimental // observable with an added _IMP suffix. book(_impcalib, "V0A_IMP", 400, 0.0, 20.0); } /// Perform the per-event analysis void analyze(const Event& event) { // The alternative centrality based on generated impact // parameter, assumes that the generator does not describe the // full final state, and should therefore be filled even if the // event is not triggered. _impcalib->fill(apply(event, "IMP")()); if ( !apply(event, "Trigger")() ) vetoEvent; _calib->fill(apply(event, "V0A")()); } /// Finalize void finalize() { _calib->normalize(); _impcalib->normalize(); } private: /// The calibration histograms. Histo1DPtr _calib; Histo1DPtr _impcalib; }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(ALICE_2015_PPBCentrality); }