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Rivet analyses reference

TASSO_1989_I277658

Hadronic charged multiplicity measurement between 14 and 43.6 GeV
Experiment: TASSO (PEP)
Inspire ID: 277658
Status: VALIDATED
Authors:
  • Peter Richardson
References:
  • Z.Phys. C45 (1989) 193
Beams: e+ e-
Beam energies: (7.0, 7.0); (11.0, 11.0); (17.4, 17.4); (21.8, 21.8) GeV
Run details:
  • Hadronic e+ e- events generated below the Z pole. Beam energy must be specified as analysis option "ENERGY" when rivet-merging samples.

The charged particle multiplicity distribution of hadronic $e^+e^-$ events as measured between 14 and 43.6 GeV using the TASSO detector at PEP. Beam energy must be specified as analysis option "ENERGY" when rivet-merging samples.

Source code: TASSO_1989_I277658.cc
 1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/ChargedFinalState.hh"
 4
 5namespace Rivet {
 6
 7
 8  /// @brief Add a short analysis description here
 9  class TASSO_1989_I277658 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(TASSO_1989_I277658);
14
15
16    /// @name Analysis methods
17    /// @{
18
19    /// Book histograms and initialise projections before the run
20    void init() {
21      const ChargedFinalState cfs;
22      declare(cfs, "CFS");
23
24      offset = 0;
25      if (isCompatibleWithSqrtS(14.0*GeV)) {
26        offset = 1;
27      }
28      else if (isCompatibleWithSqrtS(22.0*GeV)) {
29        offset = 2;
30      }
31      else if (isCompatibleWithSqrtS(34.8*GeV)) {
32        offset = 3;
33      }
34      else if (isCompatibleWithSqrtS(43.6*GeV)) {
35        offset = 4;
36      }
37      else {
38        MSG_WARNING("CoM energy of events sqrt(s) = " << sqrtS()/GeV
39                    << " doesn't match any available analysis energy .");
40      }
41      book(_histCh, 5, 1, offset);
42      book(_histTotal, 2, 1, 1);
43    }
44
45
46    /// Perform the per-event analysis
47    void analyze(const Event& event) {
48      if (Ecm == "")  Ecm = _histTotal->bin(offset).xEdge();
49      const FinalState& cfs = apply<FinalState>(event, "CFS");
50      MSG_DEBUG("Total charged multiplicity = " << cfs.size());
51      _histCh->fill(cfs.size());
52      _histTotal->fill(Ecm, cfs.size());
53    }
54
55
56    /// Normalise histograms etc., after the run
57    void finalize() {
58      scale(_histCh, 1.0/sumOfWeights());
59    }
60
61    /// @}
62
63
64  private:
65
66    /// @name Histograms
67    /// @{
68    BinnedHistoPtr<int> _histCh;
69    BinnedProfilePtr<string> _histTotal;
70    string Ecm = "";
71    int offset;
72    /// @}
73  };
74
75
76  RIVET_DECLARE_PLUGIN(TASSO_1989_I277658);
77
78
79}