Rivet analyses referenceFENICE_1994_I377833Cross section for $e^+e^-\to p\bar{p}$ between 1.9 and 2.44 GeVExperiment: FENICE (ADONE) Inspire ID: 377833 Status: VALIDATED Authors:
Beam energies: ANY Run details:
Measurement of the cross section for $e^+e^-\to p\bar{p}$ between 1.9 and 2.44 GeV. Source code: FENICE_1994_I377833.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/FinalState.hh"
4#include "Rivet/Projections/UnstableParticles.hh"
5
6namespace Rivet {
7
8
9 /// @brief Add a short analysis description here
10 class FENICE_1994_I377833 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(FENICE_1994_I377833);
15
16
17 /// @name Analysis methods
18 /// @{
19
20 /// Book histograms and initialise projections before the run
21 void init() {
22 // Initialise and register projections
23 declare(FinalState(), "FS");
24 declare(UnstableParticles(), "UFS");
25 book(_nProton, "/TMP/nProton" );
26 }
27
28
29 /// Perform the per-event analysis
30 void analyze(const Event& event) {
31 const FinalState& fs = apply<FinalState>(event, "FS");
32 // total hadronic and muonic cross sections
33 map<long,int> nCount;
34 int ntotal(0);
35 for (const Particle& p : fs.particles()) {
36 nCount[p.pid()] += 1;
37 ++ntotal;
38 }
39 if(ntotal==2 && nCount[2212]==1 && nCount[-2212]==1)
40 _nProton->fill();
41 }
42
43
44 /// Normalise histograms etc., after the run
45 void finalize() {
46 double fact = crossSection()/ sumOfWeights() /nanobarn;
47 double sigma = _nProton->val()*fact;
48 double error = _nProton->err()*fact;
49 Estimate1DPtr mult;
50 book(mult, 1, 1, 1);
51 for (auto& b : mult->bins()) {
52 if (inRange(sqr(sqrtS()/GeV), b.xMin(), b.xMax())) {
53 b.set(sigma, error);
54 }
55 }
56 }
57
58 /// @}
59
60
61 /// @name Histograms
62 /// @{
63 CounterPtr _nProton;
64 /// @}
65
66
67 };
68
69
70 RIVET_DECLARE_PLUGIN(FENICE_1994_I377833);
71
72
73}
|