Rivet analyses reference

CDF_2009_NOTE_9936

CDF Run 2 min bias charged multiplicity analysis
Experiment: CDF (Tevatron Run 2)
Spires ID: None
Status: OBSOLETE
Authors:

Holger Schulz

References:

CDF public note 9936
http://www-cdf.fnal.gov/physics/new/qcd/minbias_mult09/multpage.html

Beams: p- p+
Beam energies: (980.0, 980.0) GeV
Run details:

$p\bar{p}$ QCD interactions at 1960 GeV. Particles with $c \tau > 10$ mm should be set stable.

Niccolo Moggi's min bias analysis. Minimum bias events are used to measure the charged multiplicity distribution. The multiplicity distribution was not published in S8233977 but the numbers and a public note are available from the CDF website given above. Note: the systematic and statistical errors in Rivet were added in quadrature.

Source code: CDF_2009_NOTE_9936.cc

 1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/ChargedFinalState.hh"
 4#include "Rivet/Projections/TriggerCDFRun2.hh"
 5
 6namespace Rivet {
 7
 8
 9  class CDF_2009_NOTE_9936 : public Analysis {
10  public:
11
12    /// @name Constructors etc.
13    /// @{
14
15    /// Constructor
16    RIVET_DEFAULT_ANALYSIS_CTOR(CDF_2009_NOTE_9936);
17
18    /// @}
19
20
21  public:
22
23    /// @name Analysis methods
24    /// @{
25
26    /// Book histograms and initialise projections before the run
27    void init() {
28
29      declare(TriggerCDFRun2(), "Trigger");
30
31      declare(ChargedFinalState((Cuts::etaIn(-1.0, 1.0) && Cuts::pT >=  0.4*GeV)), "CFS");
32
33      book(_hist_nch ,1, 1, 1);
34    }
35
36
37    /// Perform the per-event analysis
38    void analyze(const Event& event) {
39      // MinBias Trigger
40      const bool trigger = apply<TriggerCDFRun2>(event, "Trigger").minBiasDecision();
41      if (!trigger) vetoEvent;
42
43      // Get events charged multiplicity and fill histogram
44      const ChargedFinalState& cfs = apply<ChargedFinalState>(event, "CFS");
45      _hist_nch->fill(cfs.size());
46
47    }
48
49
50    /// Normalise histograms etc., after the run
51    void finalize() {
52      normalize(_hist_nch);
53    }
54
55    /// @}
56
57  private:
58
59    Histo1DPtr _hist_nch;
60
61  };
62
63
64
65  RIVET_DECLARE_PLUGIN(CDF_2009_NOTE_9936);
66
67}