Rivet analyses referencePLUTO_1979_I140818Hadronic cross section in $e^+e^-$ collisions for energies between 9.4 to 9.48Experiment: PLUTO (PETRA) Inspire ID: 140818 Status: VALIDATED Authors:
Beam energies: ANY Run details:
Measurement of the hadronic cross section in $e^+e^-$ collisions for energies between 9.4 to 9.48 GeV. Source code: PLUTO_1979_I140818.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 PLUTO_1979_I140818 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(PLUTO_1979_I140818);
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 // counters for R
24 book(_c_hadrons, "/TMP/sigma_hadrons");
25 }
26
27
28 /// Perform the per-event analysis
29 void analyze(const Event& event) {
30 const FinalState& fs = apply<FinalState>(event, "FS");
31
32 map<long,int> nCount;
33 int ntotal(0);
34 unsigned int nCharged(0);
35 for (const Particle& p : fs.particles()) {
36 nCount[p.pid()] += 1;
37 ++ntotal;
38 if(PID::isCharged(p.pid())) ++nCharged;
39 }
40 // mu+mu- + photons
41 if(nCount[-13]==1 and nCount[13]==1 &&
42 ntotal==2+nCount[22])
43 vetoEvent;
44 // everything else
45 else {
46 _c_hadrons->fill();
47 }
48
49 }
50
51
52 /// Normalise histograms etc., after the run
53 void finalize() {
54 double fact = crossSection()/ sumOfWeights() /nanobarn;
55 double sig_h = _c_hadrons->val()*fact;
56 double err_h = _c_hadrons->err()*fact;
57 Scatter2D temphisto(refData(2, 1, 1));
58 Scatter2DPtr hadrons;
59 book(hadrons, 2, 1, 1);
60 for (size_t b = 0; b < temphisto.numPoints(); b++) {
61 const double x = temphisto.point(b).x();
62 pair<double,double> ex = temphisto.point(b).xErrs();
63 pair<double,double> ex2 = ex;
64 if(ex2.first ==0.) ex2. first=0.0001;
65 if(ex2.second==0.) ex2.second=0.0001;
66 if (inRange(sqrtS()/GeV, x-ex2.first, x+ex2.second)) {
67 hadrons->addPoint(x, sig_h, ex, make_pair(err_h,err_h));
68 }
69 else {
70 hadrons->addPoint(x, 0., ex, make_pair(0.,.0));
71 }
72 }
73 }
74
75 //@}
76
77
78 /// @name Histograms
79 //@{
80 CounterPtr _c_hadrons;
81 //@}
82
83
84 };
85
86
87 // The hook for the plugin system
88 RIVET_DECLARE_PLUGIN(PLUTO_1979_I140818);
89
90
91}
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