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## Rivet analyses reference

### MC_DIS_Check

A simple analysis using the DISKinematics projection.
Experiment: (HERA)
Status: UNVALIDATED REENTRANT
Authors:
• Hannes Jung
  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 73 74 75 76 77 78 79 80 81 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/FinalState.hh" #include "Rivet/Projections/FastJets.hh" #include "Rivet/Projections/DISKinematics.hh" namespace Rivet { /// @brief A simple analysis to illustrate how to use the /// DISKinematics projection together with different options. class MC_DIS_Check : public Analysis { public: /// Constructor DEFAULT_RIVET_ANALYSIS_CTOR(MC_DIS_Check); /// @name Analysis methods //@{ /// Book histograms and initialise projections before the run void init() { // Initialise and register projections. Note that the definition // of the scattered lepton can be influenced by sepcifying // options as declared in the .info file. DISLepton lepton(options()); declare(lepton, "Lepton"); declare(DISKinematics(lepton), "Kinematics"); // Book histograms book(_hist_Q2, "Q2",logspace(100,0.1, 1000.0)); book(_hist_y, "y",100,0.,1.); book(_hist_x, "xBj",logspace(100,0.00001, 1.0)); } /// Perform the per-event analysis void analyze(const Event& event) { // Get the DIS kinematics const DISKinematics& dk = apply(event, "Kinematics"); if ( dk.failed() ) return; double x = dk.x(); double y = dk.y(); double Q2 = dk.Q2(); // Weight of the event _hist_Q2->fill(Q2); _hist_y->fill(y); _hist_x->fill(x); /// @todo Do the event by event analysis here } /// Normalise histograms etc., after the run void finalize() { normalize(_hist_Q2); // normalize to unity normalize(_hist_y); // normalize to unity } //@} /// The histograms. Histo1DPtr _hist_Q2, _hist_y, _hist_x; }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(MC_DIS_Check); }