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BESIII_2021_I1867196

Cross section for $e^+e^-\to D_S^{*+} D_{s0}^*(2317)^-$, $D_S^{*+} D_{s1}^*(2460)^-$, $D_S^{*+} D_{s1}^*(2536)^-$ between 4.6 and 4.7 GeV
Experiment: BESIII (BEPC)
Inspire ID: 1867196
Status: VALIDATED
Authors:
  • Peter Richardson
References:
  • Phys.Rev.D 104 (2021) 032012
Beams: e+ e-
Beam energies: ANY
Run details:
  • e+e- to hadrons

Measurement of the cross section for Cross section for $e^+e^-\to D_S^{*+} D_{s0}^*(2317)^-$, $D_S^{*+} D_{s1}^*(2460)^-$, $D_S^{*+} D_{s1}^*(2536)^-$ between 4.6 and 4.7 GeV by the BESIII collaboration.

Source code: BESIII_2021_I1867196.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 e+e- -> D_s* D_sJ
 10  class BESIII_2021_I1867196 : public Analysis {
 11  public:
 12
 13    /// Constructor
 14    RIVET_DEFAULT_ANALYSIS_CTOR(BESIII_2021_I1867196);
 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      // Histograms
 26      for(unsigned int ix=0;ix<3;++ix) {
 27	book(_numD[ix],"TMP/num_"+to_string(ix));
 28      }
 29    }
 30
 31    void findChildren(const Particle & p,map<long,int> & nRes, int &ncount) {
 32      for (const Particle &child : p.children()) {
 33	if(child.children().empty()) {
 34	  nRes[child.pid()]-=1;
 35	  --ncount;
 36	}
 37	else
 38	  findChildren(child,nRes,ncount);
 39      }
 40    }
 41
 42    /// Perform the per-event analysis
 43    void analyze(const Event& event) {
 44
 45      const FinalState& fs = apply<FinalState>(event, "FS");
 46
 47      map<long,int> nCount;
 48      int ntotal(0);
 49      for (const Particle& p : fs.particles()) {
 50	nCount[p.pid()] += 1;
 51	++ntotal;
 52      }
 53      const FinalState& ufs = apply<FinalState>(event, "UFS");
 54      // loop over D_s*
 55      for(const Particle & Dstar : ufs.particles(Cuts::abspid==433)) {
 56	map<long,int> nRes = nCount;
 57	int ncount = ntotal;
 58	findChildren(Dstar,nRes,ncount);
 59	bool matched=false;
 60	for(const Particle & p : ufs.particles(Cuts::abspid==10431 or
 61					       Cuts::abspid==10433 or
 62					       Cuts::abspid==20433)) {
 63	  // check particle and antiparticle
 64	  if(Dstar.pid()*p.pid()>0) continue;
 65	  map<long,int> nRes2 = nRes;
 66	  int ncount2 = ncount;
 67	  findChildren(p,nRes2,ncount2);
 68	  if(ncount2!=0) continue;
 69	  matched=true;
 70	  for(auto const & val : nRes2) {
 71	    if(val.second!=0) {
 72	      matched = false;
 73	      break;
 74	    }
 75	  }
 76	  if(matched) {
 77	    if(p.abspid()==10431) _numD[0]->fill();
 78	    else if(p.abspid()==20433) _numD[1]->fill();
 79	    else if(p.abspid()==10433) _numD[2]->fill();
 80	    break;
 81	  }
 82	}
 83	if(matched) break;
 84      }
 85    }
 86
 87
 88    /// Normalise histograms etc., after the run
 89    void finalize() {
 90      double fact = crossSection()/picobarn/sumOfWeights();
 91      for(unsigned int ix=0;ix<3;++ix) {
 92	double sigma = _numD[ix]->val()*fact;
 93	double error = _numD[ix]->err()*fact;
 94	Scatter2D temphisto(refData(1+ix, 1, 1));
 95	Scatter2DPtr  mult;
 96	book(mult, 1+ix, 1, 1);
 97	for (size_t b = 0; b < temphisto.numPoints(); b++) {
 98	  const double x  = temphisto.point(b).x();
 99	  pair<double,double> ex = temphisto.point(b).xErrs();
100	  pair<double,double> ex2 = ex;
101	  if(ex2.first ==0.) ex2. first=0.0001;
102	  if(ex2.second==0.) ex2.second=0.0001;
103	  if (inRange(sqrtS()/GeV, x-ex2.first, x+ex2.second)) {
104	    mult->addPoint(x, sigma, ex, make_pair(error,error));
105	  }
106	  else {
107	    mult->addPoint(x, 0., ex, make_pair(0.,.0));
108	  }
109	}
110      }
111    }
112
113    ///@}
114
115
116    /// @name Histograms
117    ///@{
118    CounterPtr _numD[3];
119    ///@}
120
121
122  };
123
124
125  RIVET_DECLARE_PLUGIN(BESIII_2021_I1867196);
126
127}