Rivet analyses referenceBESIII_2023_I2645388Cross section for $e^+e^-\to D^{*0}D^{*-}\pi^+$+c.c. for $\sqrt{s}=4.189\to4.951$ GeVExperiment: BESIII (BEPC) Inspire ID: 2645388 Status: VALIDATED NOHEPDATA Authors:
Beam energies: (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.3, 2.3); (2.3, 2.3); (2.3, 2.3); (2.3, 2.3); (2.3, 2.3); (2.3, 2.3); (2.3, 2.3); (2.3, 2.3); (2.3, 2.3); (2.3, 2.3); (2.3, 2.3); (2.3, 2.3); (2.3, 2.3); (2.3, 2.3); (2.3, 2.3); (2.3, 2.3); (2.4, 2.4); (2.4, 2.4); (2.4, 2.4); (2.4, 2.4); (2.5, 2.5); (2.5, 2.5) GeV Run details:
Cross section for $e^+e^-\to D^{*0}D^{*-}\pi^+$+c.c. for $\sqrt{s}=4.189\to4.951$ GeV. Beam energy must be specified as analysis option "ENERGY" when rivet-merging samples. Source code: BESIII_2023_I2645388.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 Cross section for D*0 D*- pi+ + c.c.
10 class BESIII_2023_I2645388 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(BESIII_2023_I2645388);
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 for(unsigned int ix=0;ix<2;++ix) {
26 book(_sigma[ix], 1+ix, 1, 1);
27 for (const string& en : _sigma[ix].binning().edges<0>()) {
28 const double end = std::stod(en)*GeV;
29 if (isCompatibleWithSqrtS(end)) {
30 _ecms[ix] = en;
31 break;
32 }
33 }
34 }
35 if (_ecms[0].empty() && _ecms[1].empty()) {
36 MSG_ERROR("Beam energy incompatible with analysis.");
37 }
38 }
39
40 void findChildren(const Particle & p,map<long,int> & nRes, int &ncount) {
41 for (const Particle &child : p.children()) {
42 if(child.children().empty()) {
43 nRes[child.pid()]-=1;
44 --ncount;
45 }
46 else {
47 findChildren(child,nRes,ncount);
48 }
49 }
50 }
51
52 /// Perform the per-event analysis
53 void analyze(const Event& event) {
54 const FinalState& fs = apply<FinalState>(event, "FS");
55
56 map<long,int> nCount;
57 int ntotal(0);
58 for (const Particle& p : fs.particles()) {
59 nCount[p.pid()] += 1;
60 ++ntotal;
61 }
62 const FinalState& ufs = apply<FinalState>(event, "UFS");
63 for (const Particle & p1 : ufs.particles(Cuts::abspid==423)) {
64 map<long,int> nRes = nCount;
65 int ncount = ntotal;
66 findChildren(p1,nRes,ncount);
67 bool matched=false;
68 int id2 = p1.pid()>0 ? -413 : 413;
69 int ipi = p1.pid()>0 ? 211 : -211;
70 for (const Particle & p2 : ufs.particles(Cuts::pid==id2)) {
71 map<long,int> nRes2 = nRes;
72 int ncount2 = ncount;
73 findChildren(p2,nRes2,ncount2);
74 if (ncount2!=1) continue;
75 matched=true;
76 for (const auto& val : nRes2) {
77 if (val.first==ipi) {
78 if (val.second!=1) {
79 matched = false;
80 break;
81 }
82 }
83 else if (val.second!=0) {
84 matched = false;
85 break;
86 }
87 }
88 if (matched) break;
89 }
90 if (matched) {
91 for (unsigned int ix=0; ix<2; ++ix) {
92 if (!_ecms[ix].empty()) _sigma[ix]->fill(_ecms[ix]);
93 }
94 }
95 }
96 }
97
98
99 /// Normalise histograms etc., after the run
100 void finalize() {
101 scale(_sigma,crossSection()/ sumOfWeights() /picobarn);
102 }
103
104 /// @}
105
106
107 /// @name Histograms
108 /// @{
109 BinnedHistoPtr<string> _sigma[2];
110 string _ecms[2];
111 /// @}
112
113
114 };
115
116
117 RIVET_DECLARE_PLUGIN(BESIII_2023_I2645388);
118
119}
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