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Rivet analyses reference

MARKI_1976_I109792

Charged particle momentum distributions for energies between 3.0 and 7.4 GeV
Experiment: MARK-I (SPEAR)
Inspire ID: 109792
Status: VALIDATED
Authors:
  • Peter Richardson
No references listed
Beams: e- e+
Beam energies: (1.5, 1.5); (2.4, 2.4); (2.9, 2.9); (3.1, 3.1); (3.3, 3.3); (3.5, 3.5); (3.7, 3.7) GeV
Run details:
  • e+e- > hadrons. Beam energy must be specified as analysis option "ENERGY" when rivet-merge'ing samples.

Charged particle momentum distributions for energies between 3.0 and 7.4 GeV. Beam energy must be specified as analysis option "ENERGY" when rivet-merging samples.

Source code: MARKI_1976_I109792.cc
 1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/ChargedFinalState.hh"
 4
 5namespace Rivet {
 6
 7
 8  /// @brief Charged particle spectra between 3.0 and 7.4 GeV
 9  class MARKI_1976_I109792 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(MARKI_1976_I109792);
14
15
16    /// @name Analysis methods
17    //@{
18
19    /// Book histograms and initialise projections before the run
20    void init() {
21      const ChargedFinalState fs;
22      declare(fs, "FS");
23      unsigned int iloc(0);
24      if(isCompatibleWithSqrtS(3.0))
25	iloc = 8;
26      else if(isCompatibleWithSqrtS(4.8))
27	iloc = 7;
28      else if(isCompatibleWithSqrtS(5.8))
29	iloc = 6;
30      else if(isCompatibleWithSqrtS(6.2))
31	iloc = 5;
32      else if(isCompatibleWithSqrtS(6.6))
33	iloc = 4;
34      else if(isCompatibleWithSqrtS(7.0))
35	iloc = 3;
36      else if(isCompatibleWithSqrtS(7.4))
37	iloc = 2;
38      else
39        MSG_ERROR("Beam energy incompatible with analysis.");
40      assert(iloc!=0);
41      book(_h_x, iloc   ,1,1);
42    }
43
44
45    /// Perform the per-event analysis
46    void analyze(const Event& event) {
47      const ChargedFinalState& fs = apply<ChargedFinalState>(event, "FS");
48      if(fs.particles().size()==2 &&
49	 abs(fs.particles()[0].pid())==13 &&
50	 abs(fs.particles()[1].pid())==13) vetoEvent;
51      for (const Particle& p : fs.particles()) {
52	const Vector3 mom3 = p.p3();
53	double pp = mom3.mod();
54	double x = 2.*pp/sqrtS();
55	_h_x->fill(x);
56      }
57    }
58
59
60    /// Normalise histograms etc., after the run
61    void finalize() {
62      scale(_h_x,crossSection()*sqr(sqrtS())/sumOfWeights()/microbarn);
63    }
64
65    //@}
66
67
68    /// @name Histograms
69    //@{
70    Histo1DPtr _h_x;
71    //@}
72
73
74  };
75
76
77  // The hook for the plugin system
78  RIVET_DECLARE_PLUGIN(MARKI_1976_I109792);
79
80
81}