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BABAR_2017_I1591716

Cross section for $e^+e^-\to K_S^0K^\pm\pi^\mp$ with $\pi^0$, $\eta$ between threshold and 4 GeV
Experiment: BABAR (PEP-II)
Inspire ID: 1591716
Status: VALIDATED NOHEPDATA
Authors:
  • Peter Richardson
References:
  • Phys.Rev. D95 (2017) no.9, 092005
Beams: e+ e-
Beam energies: ANY
Run details:
  • e+e- to hadrons

Cross section for $e^+e^-\to K_S^0K^\pm\pi^\mp$ with $\pi^0$, $\eta$ between threshold and 4 GeV using radiative events.

Source code: BABAR_2017_I1591716.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 BABAR_2017_I1591716 : public Analysis {
 11  public:
 12
 13    /// Constructor
 14    RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2017_I1591716);
 15
 16
 17    /// @name Analysis methods
 18    //@{
 19
 20    /// Book histograms and initialise projections before the run
 21    void init() {
 22
 23      // Initialise and register projections
 24      declare(FinalState(), "FS");
 25      declare(UnstableParticles(), "UFS");
 26
 27      book(_nKKpipi, "TMP/KKpipi");
 28      book(_nKKpieta, "TMP/KKpieta");
 29
 30    }
 31
 32    void findChildren(const Particle & p,map<long,int> & nRes, int &ncount) {
 33      for (const Particle &child : p.children()) {
 34	if(child.children().empty()) {
 35	  nRes[child.pid()]-=1;
 36	  --ncount;
 37	}
 38	else
 39	  findChildren(child,nRes,ncount);
 40      }
 41    }
 42
 43
 44    /// Perform the per-event analysis
 45    void analyze(const Event& event) {
 46      const FinalState& fs = apply<FinalState>(event, "FS");
 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      // stable histos
 54      if( ntotal == 4 && nCount[310] == 1 && nCount[111] == 1 &&
 55	  ( (nCount[ 321]==1 && nCount[-211]==1) ||
 56	    (nCount[-321]==1 && nCount[ 211]==1)))
 57	_nKKpipi->fill();
 58
 59      // unstable particles
 60      const FinalState& ufs = apply<FinalState>(event, "UFS");
 61      for (const Particle& p : ufs.particles()) {
 62	if(p.children().empty()) continue;
 63	if(p.pid()!=221) continue;
 64	map<long,int> nRes=nCount;
 65	int ncount = ntotal;
 66	findChildren(p,nRes,ncount);
 67	bool matched  = true;
 68	if(p.pid()==221 && ncount==3) {
 69	  for(auto const & val : nRes) {
 70	    if(val.first==310 || val.first==111) {
 71	      if(val.second!=1) {
 72		matched = false;
 73		break;
 74	      }
 75	    }
 76	    else if(abs(val.first)==321 || abs(val.first)==211)
 77	      continue;
 78	    else if(val.second!=0) {
 79	      matched = false;
 80	      break;
 81	    }
 82	  }
 83	  if(matched) {
 84	    if((nRes[321]==1 && nRes[-211]==1 && nRes[-321]==0 && nRes[211]==0) ||
 85	       (nRes[321]==0 && nRes[-211]==0 && nRes[-321]==1 && nRes[211]==1))
 86	    _nKKpieta->fill();
 87	  }
 88	}
 89      }
 90    }
 91
 92
 93    /// Normalise histograms etc., after the run
 94    void finalize() {
 95      for(unsigned int ix=1;ix<3;++ix) {
 96	double sigma = 0., error = 0.;
 97	if(ix==1) {
 98	  sigma = _nKKpipi->val();
 99	  error = _nKKpipi->err();
100	}
101	else if (ix==2) {
102	  sigma = _nKKpieta->val();
103	  error = _nKKpieta->err();
104	}
105	  
106	sigma *= crossSection()/ sumOfWeights() /nanobarn;
107	error *= crossSection()/ sumOfWeights() /nanobarn;
108	
109	Scatter2D temphisto(refData(ix, 1, 1));
110	Scatter2DPtr  mult;
111        book(mult, ix, 1, 1);
112	for (size_t b = 0; b < temphisto.numPoints(); b++) {
113	  const double x  = temphisto.point(b).x();
114	  pair<double,double> ex = temphisto.point(b).xErrs();
115	  pair<double,double> ex2 = ex;
116	  if(ex2.first ==0.) ex2. first=0.0001;
117	  if(ex2.second==0.) ex2.second=0.0001;
118	  if (inRange(sqrtS()/GeV, x-ex2.first, x+ex2.second)) {
119	    mult->addPoint(x, sigma, ex, make_pair(error,error));
120	  }
121	  else {
122	    mult->addPoint(x, 0., ex, make_pair(0.,.0));
123	  }
124	}
125      }
126    }
127
128    //@}
129
130
131    /// @name Histograms
132    //@{
133    CounterPtr _nKKpipi,_nKKpieta;
134    //@}
135
136
137  };
138
139
140  // The hook for the plugin system
141  RIVET_DECLARE_PLUGIN(BABAR_2017_I1591716);
142
143
144}