Rivet analyses referenceTASSO_1984_I199468Measurement of $R$ for energies between 39.8 and 45.2 GeVExperiment: TASSO (PETRA) Inspire ID: 199468 Status: VALIDATED Authors:
Beam energies: ANY Run details:
Measurement of $R$ in $e^+e^-$ collisions for energies between 39.8 and 45.2 GeV. The individual hadronic and muonic cross sections are also outputted to the yoda file so that ratio $R$ can be recalculated if runs are combined. Source code: TASSO_1984_I199468.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 TASSO_1984_I199468 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(TASSO_1984_I199468);
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 book(_c_muons, "/TMP/sigma_muons");
27 }
28
29
30 /// Perform the per-event analysis
31 void analyze(const Event& event) {
32
33 const FinalState& fs = apply<FinalState>(event, "FS");
34
35 map<long,int> nCount;
36 int ntotal(0);
37 for (const Particle& p : fs.particles()) {
38 nCount[p.pid()] += 1;
39 ++ntotal;
40 }
41 // mu+mu- + photons
42 if(nCount[-13]==1 and nCount[13]==1 &&
43 ntotal==2+nCount[22])
44 _c_muons->fill();
45 // everything else
46 else
47 _c_hadrons->fill();
48
49 }
50
51 /// Normalise histograms etc., after the run
52 void finalize() {
53 Scatter1D R = *_c_hadrons/ *_c_muons;
54 double rval = R.point(0).x();
55 pair<double,double> rerr = R.point(0).xErrs();
56 double fact = crossSection()/ sumOfWeights() /picobarn;
57 double sig_h = _c_hadrons->val()*fact;
58 double err_h = _c_hadrons->err()*fact;
59 double sig_m = _c_muons ->val()*fact;
60 double err_m = _c_muons ->err()*fact;
61 for(unsigned int ix=1;ix<3;++ix) {
62 Scatter2D temphisto(refData(ix, 1, 1));
63 std::ostringstream title;
64 title << "d0" << ix;
65 Scatter2DPtr hadrons;
66 book(hadrons, title.str()+"_sigma_hadrons");
67 Scatter2DPtr muons;
68 book(muons, title.str()+"_sigma_muons" );
69 Scatter2DPtr mult;
70 book(mult, ix, 1, 1);
71 for (size_t b = 0; b < temphisto.numPoints(); b++) {
72 const double x = temphisto.point(b).x();
73 pair<double,double> ex = temphisto.point(b).xErrs();
74 pair<double,double> ex2 = ex;
75 if(ex2.first ==0.) ex2. first=0.0001;
76 if(ex2.second==0.) ex2.second=0.0001;
77 if (inRange(sqrtS()/GeV, x-ex2.first, x+ex2.second)) {
78 mult ->addPoint(x, rval, ex, rerr);
79 hadrons->addPoint(x, sig_h, ex, make_pair(err_h,err_h));
80 muons ->addPoint(x, sig_m, ex, make_pair(err_m,err_m));
81 }
82 else {
83 mult ->addPoint(x, 0., ex, make_pair(0.,.0));
84 hadrons->addPoint(x, 0., ex, make_pair(0.,.0));
85 muons ->addPoint(x, 0., ex, make_pair(0.,.0));
86 }
87 }
88 }
89 }
90 //@}
91
92 /// @name Histograms
93 //@{
94 CounterPtr _c_hadrons, _c_muons;
95 //@}
96
97 };
98
99
100 // The hook for the plugin system
101 RIVET_DECLARE_PLUGIN(TASSO_1984_I199468);
102
103
104}
|