Rivet analyses referenceGAMMAGAMMA_1980_I153382Cross section for $e^+e^-\to\pi^+\pi^+\pi^-\pi^+$ between 1.456 and 2.15 GeVExperiment: GAMMAGAMMA (ADONE) Inspire ID: 153382 Status: VALIDATED Authors:
Beam energies: ANY Run details:
Measurement of the cross section for $e^+e^-\to\pi^+\pi^+\pi^-\pi^+$ for energies between 1.456 and 2.15 GeV Source code: GAMMAGAMMA_1980_I153382.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/FinalState.hh"
4
5namespace Rivet {
6
7
8 /// @brief e+e- > 2pi+2pi-
9 class GAMMAGAMMA_1980_I153382 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(GAMMAGAMMA_1980_I153382);
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 // Book histograms
24 book(_npion, "TMP/pion", refData(1, 1, 1));
25 }
26
27
28 /// Perform the per-event analysis
29 void analyze(const Event& event) {
30 const FinalState& fs = apply<FinalState>(event, "FS");
31 if(fs.particles().size()!=4) vetoEvent;
32 for (const Particle& p : fs.particles()) {
33 if(abs(p.pid())!=PID::PIPLUS) vetoEvent;
34 }
35 _npion->fill(sqrtS()/GeV);
36 }
37
38
39 /// Normalise histograms etc., after the run
40 void finalize() {
41 scale(_npion, crossSection()/ sumOfWeights() /nanobarn);
42 Estimate1DPtr mult;
43 book(mult, 1, 1, 1);
44 barchart(_npion,mult);
45 }
46
47 /// @}
48
49
50 /// @name Histograms
51 /// @{
52 Histo1DPtr _npion;
53 /// @}
54
55
56 };
57
58
59 RIVET_DECLARE_PLUGIN(GAMMAGAMMA_1980_I153382);
60
61
62}
|