Rivet analyses referenceDM1_1982_I169382Cross section for $e^+e^-\to K^+K^-\pi^+\pi^-$ between 1.3 and 2.2 GeVExperiment: DM1 (DCI) Inspire ID: 169382 Status: VALIDATED Authors:
Beam energies: ANY Run details:
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 DM1_1982_I169382 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(DM1_1982_I169382);
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(_cKpKmpippim, "TMP/KpKmpippim");
24 }
25
26
27 /// Perform the per-event analysis
28 void analyze(const Event& event) {
29 const FinalState& fs = apply<FinalState>(event, "FS");
30
31 map<long,int> nCount;
32 int ntotal(0);
33 for (const Particle& p : fs.particles()) {
34 nCount[p.pid()] += 1;
35 ++ntotal;
36 }
37
38 if(ntotal!=4) vetoEvent;
39 if(nCount[321]==1 && nCount[-321]==1 && nCount[211]==1 && nCount[-211]==1)
40 _cKpKmpippim->fill();
41 }
42
43
44 /// Normalise histograms etc., after the run
45 void finalize() {
46 double sigma = _cKpKmpippim->val();
47 double error = _cKpKmpippim->err();
48 sigma *= crossSection()/ sumOfWeights() /nanobarn;
49 error *= crossSection()/ sumOfWeights() /nanobarn;
50 Estimate1DPtr mult;
51 book(mult, 1, 1, 1);
52 for (auto& b : mult->bins()) {
53 if (inRange(sqrtS()/GeV, b.xMin(), b.xMax())) {
54 b.set(sigma, error);
55 }
56 }
57 }
58
59 /// @}
60
61
62 /// @name Histograms
63 /// @{
64 CounterPtr _cKpKmpippim;
65 /// @}
66
67
68 };
69
70
71 RIVET_DECLARE_PLUGIN(DM1_1982_I169382);
72
73
74}
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