rivet is hosted by Hepforge, IPPP Durham

Rivet analyses reference

FENICE_1996_I426675

Measurement of the hadronic cross section near the $N\bar{N}$ threshold
Experiment: FENICE (ADONE)
Inspire ID: 426675
Status: VALIDATED
Authors:
  • Peter Richardson
No references listed
Beams: e- e+
Beam energies: ANY
Run details:
  • e+ e- to hadrons and e+ e- to mu+ mu- (for normalization)

Measurement of hadronic cross section in $e^+e^-$ collisions near the nucelon-antinucleon threshold by the FENICE experiment.

Source code: FENICE_1996_I426675.cc
 1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/FinalState.hh"
 4
 5namespace Rivet {
 6
 7
 8  /// @brief Add a short analysis description here
 9  class FENICE_1996_I426675 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(FENICE_1996_I426675);
14
15
16    /// @name Analysis methods
17    //@{
18
19    /// Book histograms and initialise projections before the run
20    void init() {
21      // Initialise and register projections
22      declare(FinalState(), "FS");
23
24      // Book histograms
25      book(_c_hadrons, "/TMP/sigma_hadrons");
26    }
27
28
29    /// Perform the per-event analysis
30    void analyze(const Event& event) {
31      const FinalState& fs = apply<FinalState>(event, "FS");
32
33      map<long,int> nCount;
34      int ntotal(0);
35      for (const Particle& p : fs.particles()) {
36	nCount[p.pid()] += 1;
37	++ntotal;
38      }
39      // mu+mu- + photons
40      if(nCount[-13]==1 and nCount[13]==1 &&
41	 ntotal==2+nCount[22])
42	vetoEvent;
43      _c_hadrons->fill();
44    }
45
46
47    /// Normalise histograms etc., after the run
48    void finalize() {
49      double fact = crossSection()/ sumOfWeights() /nanobarn;
50      double sig_h = _c_hadrons->val()*fact;
51      double err_h = _c_hadrons->err()*fact;
52      Scatter2D temphisto(refData(1, 1, 1));
53      Scatter2DPtr hadrons;
54      book(hadrons, 1, 1, 1);
55      for (size_t b = 0; b < temphisto.numPoints(); b++) {
56       	const double x  = temphisto.point(b).x();
57       	pair<double,double> ex = temphisto.point(b).xErrs();
58       	pair<double,double> ex2 = ex;
59       	if(ex2.first ==0.) ex2. first=0.0001;
60       	if(ex2.second==0.) ex2.second=0.0001;
61      	if (inRange(sqr(sqrtS()/GeV), x-ex2.first, x+ex2.second)) {
62       	  hadrons->addPoint(x, sig_h, ex, make_pair(err_h,err_h));
63      	}
64      	else {
65       	  hadrons->addPoint(x, 0., ex, make_pair(0.,.0));
66	}
67      }
68    }
69
70    //@}
71
72
73    /// @name Histograms
74    //@{
75    CounterPtr _c_hadrons;
76    //@}
77
78
79  };
80
81
82  // The hook for the plugin system
83  RIVET_DECLARE_PLUGIN(FENICE_1996_I426675);
84
85
86}