1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/UnstableParticles.hh"
 4
 5namespace Rivet {
 6
 7
 8  /// @brief inclusive eta production
 9  class DASP_1979_I132410 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(DASP_1979_I132410);
14
15
16    /// @name Analysis methods
17    //@{
18
19    /// Book histograms and initialise projections before the run
20    void init() {
21
22      // Initialise and register projections
23      declare(UnstableParticles(), "UFS");
24
25      // Book histograms
26      book(_c_eta, "/TMP/neta");
27
28    }
29
30
31    /// Perform the per-event analysis
32    void analyze(const Event& event) {
33      const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
34      _c_eta->fill(ufs.particles(Cuts::pid==221).size());
35    }
36
37
38    /// Normalise histograms etc., after the run
39    void finalize() {
40      scale(_c_eta,1./sumOfWeights()*crossSection()/nanobarn);
41      Scatter2D temphisto(refData(1, 1, 1));
42      Scatter2DPtr mult;
43      book(mult, 1, 1, 1);
44      for (size_t b = 0; b < temphisto.numPoints(); b++) {
45	const double x  = temphisto.point(b).x();
46	pair<double,double> ex = temphisto.point(b).xErrs();
47	pair<double,double> ex2 = ex;
48	if(ex2.first ==0.) ex2. first=0.0001;
49	if(ex2.second==0.) ex2.second=0.0001;
50	if (inRange(sqrtS()/GeV, x-ex2.first, x+ex2.second)) {
51	  mult->addPoint(x, _c_eta->val(), ex, make_pair(_c_eta->err(),_c_eta->err()));
52	}
53	else {
54	  mult->addPoint(x, 0., ex, make_pair(0.,.0));
55	}
56      }
57    }
58
59    //@}
60
61
62    /// @name Histograms
63    //@{
64    CounterPtr _c_eta;
65    //@}
66
67
68  };
69
70
71  // The hook for the plugin system
72  RIVET_DECLARE_PLUGIN(DASP_1979_I132410);
73
74
75}