Rivet analyses referenceDM2_1991_I318558Cross section for $e^+e^-\to$ $K^+K^-\pi^0$ and $K^0_SK^\pm\pi^\mp$ for energies from 1.3 to 2.2 GeVExperiment: DM2 (DCI) Inspire ID: 318558 Status: VALIDATED Authors:
Beam energies: ANY Run details:
Measurement of the cross section for $e^+e^-\to$ $K^+K^-\pi^0$ and $K^0_SK^\pm\pi^\mp$ for energies from 1.3 to 2.2 GeV. Source code: DM2_1991_I318558.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 DM2_1991_I318558 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(DM2_1991_I318558);
14
15
16 /// @name Analysis methods
17 //@{
18
19 /// Book histograms and initialise projections before the run
20 void init() {
21
22 // Initialise and register projections
23 declare(FinalState(), "FS");
24 // Book histograms
25 for(unsigned int ix=1;ix<3;++ix) {
26 stringstream ss;
27 ss << "TMP/n" << ix;
28 book(_nMeson[ix], ss.str());
29 }
30 }
31
32
33 /// Perform the per-event analysis
34 void analyze(const Event& event) {
35 const FinalState& fs = apply<FinalState>(event, "FS");
36
37 map<long,int> nCount;
38 int ntotal(0);
39 for (const Particle& p : fs.particles()) {
40 nCount[p.pid()] += 1;
41 ++ntotal;
42 }
43 if(ntotal!=3) vetoEvent;
44 if(nCount[310]==1 &&
45 ((nCount[ 211]==1&&nCount[-321]==1)||
46 (nCount[-211]==1&&nCount[ 321]==1)))
47 _nMeson[1]->fill();
48 else if(nCount[321]==1 &&
49 nCount[-321]==1 && nCount[111]==1)
50 _nMeson[2]->fill();
51 }
52
53
54 /// Normalise histograms etc., after the run
55 void finalize() {
56 for(unsigned int ix=1;ix<3;++ix) {
57 double sigma = _nMeson[ix]->val();
58 double error = _nMeson[ix]->err();
59 sigma *= crossSection()/ sumOfWeights() /nanobarn;
60 error *= crossSection()/ sumOfWeights() /nanobarn;
61 Scatter2D temphisto(refData(ix, 1, 1));
62 Scatter2DPtr mult;
63 book(mult, ix, 1, 1);
64 for (size_t b = 0; b < temphisto.numPoints(); b++) {
65 const double x = temphisto.point(b).x();
66 pair<double,double> ex = temphisto.point(b).xErrs();
67 pair<double,double> ex2 = ex;
68 if(ex2.first ==0.) ex2. first=0.0001;
69 if(ex2.second==0.) ex2.second=0.0001;
70 if (inRange(sqrtS()/MeV, x-ex2.first, x+ex2.second)) {
71 mult->addPoint(x, sigma, ex, make_pair(error,error));
72 }
73 else {
74 mult->addPoint(x, 0., ex, make_pair(0.,.0));
75 }
76 }
77 }
78 }
79
80 //@}
81
82
83 /// @name Histograms
84 //@{
85 CounterPtr _nMeson[3];
86 //@}
87
88
89 };
90
91
92 // The hook for the plugin system
93 RIVET_DECLARE_PLUGIN(DM2_1991_I318558);
94
95
96}
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