Rivet analyses referenceBESII_2008_I801210Cross-sections for light hadrons at 3.773, 3.650 and 3.6648 GeVExperiment: BESII (BEPC II) Inspire ID: 801210 Status: VALIDATED Authors:
Beam energies: ANY Run details:
Cross section for $e^+e^-\to \pi^+\pi^-$, $K^+K^-$, $2\pi^+2\pi^-$, $K^+K^-\pi^+\pi^-$ and $3\pi^+3\pi^-$ together with a $\pi^0\pi^0$ pair at 3.773, 3.650 and 3.6648 GeV. Source code: BESII_2008_I801210.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/FinalState.hh"
4
5namespace Rivet {
6
7
8 /// @brief Cross-sections for light hadrons at 3.773, 3.650 and 3.6648 GeV
9 class BESII_2008_I801210 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(BESII_2008_I801210);
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
25 // Book histograms
26 for(unsigned int ix=1;ix<6;++ix) {
27 stringstream ss;
28 ss << "TMP/n" << ix;
29 book(_nMeson[ix], ss.str());
30 }
31 }
32
33
34 /// Perform the per-event analysis
35 void analyze(const Event& event) {
36 const FinalState& fs = apply<FinalState>(event, "FS");
37
38 map<long,int> nCount;
39 int ntotal(0);
40 for (const Particle& p : fs.particles()) {
41 nCount[p.pid()] += 1;
42 ++ntotal;
43 }
44 if(nCount[111]!=2) vetoEvent;
45
46 if(ntotal==4) {
47 if(nCount[211]==1 && nCount[-211]==1)
48 _nMeson[1]->fill();
49 else if(nCount[321]==1 && nCount[-321]==1)
50 _nMeson[2]->fill();
51 }
52 else if(ntotal==6) {
53 if(nCount[211]==2 && nCount[-211]==2)
54 _nMeson[3]->fill();
55 else if(nCount[321]==1 && nCount[-321]==1 &&
56 nCount[211]==1 && nCount[-211]==1)
57 _nMeson[4]->fill();
58 }
59 else if(ntotal==8) {
60 if(nCount[211]==3 && nCount[-211]==3)
61 _nMeson[5]->fill();
62 }
63
64 }
65
66
67 /// Normalise histograms etc., after the run
68 void finalize() {
69 for(unsigned int ix=1;ix<6;++ix) {
70 double sigma = _nMeson[ix]->val();
71 double error = _nMeson[ix]->err();
72 sigma *= crossSection()/ sumOfWeights() /picobarn;
73 error *= crossSection()/ sumOfWeights() /picobarn;
74 Estimate1DPtr mult;
75 book(mult, 1, 1, ix);
76 for (auto& b : mult->bins()) {
77 if (inRange(sqrtS()/GeV, b.xMin(), b.xMax())) {
78 b.set(sigma, error);
79 }
80 }
81 }
82 }
83
84 /// @}
85
86
87 /// @name Histograms
88 /// @{
89 CounterPtr _nMeson[6];
90 /// @}
91
92
93 };
94
95
96
97 RIVET_DECLARE_PLUGIN(BESII_2008_I801210);
98
99}
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