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BABAR_2014_I1287920

Cross section for $e^+e^-\to$ $K_S^0K_L^0$, $K_S^0K_L^0\pi^+\pi^-$, $K_S^0K_S^0\pi^+\pi^-$, $K_S^0K_S^0K^+K^-$ between 1.06 and 2.2 GeV
Experiment: BABAR (PEP-II)
Inspire ID: 1287920
Status: VALIDATED
Authors:
  • Peter Richardson
References:
  • Phys.Rev. D89 (2014) 092002, 2014
Beams: e+ e-
Beam energies: ANY
Run details:
  • e+e- to hadrons

Measurement of the cross section for $e^+e^-\to$ $K_S^0K_L^0$, $K_S^0K_L^0\pi^+\pi^-$, $K_S^0K_S^0\pi^+\pi^-$, $K_S^0K_S^0K^+K^-$ via radiative return, including for energies between 1.06 and 2.2 GeV

Source code: BABAR_2014_I1287920.cc
  1// -*- C++ -*-
  2#include "Rivet/Analysis.hh"
  3#include "Rivet/Projections/FinalState.hh"
  4
  5
  6namespace Rivet {
  7
  8
  9  /// @brief e+e- > K0K0 (+pions)
 10  class BABAR_2014_I1287920 : public Analysis {
 11  public:
 12
 13    /// Constructor
 14    RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2014_I1287920);
 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
 26      // Book histograms
 27      book(_nKSKL    , "TMP/nKSKL");
 28      book(_nKSKLpipi, "TMP/nKSKLpipi");
 29      book(_nKSKSpipi, "TMP/nKSKSpipi");
 30      book(_nKSKSKpKm, "TMP/nKSKSKpKm");
 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      
 45      if(ntotal==2 && nCount[130]==1 && nCount[310]==1)
 46	_nKSKL->fill();
 47      else if( ntotal==4 &&  nCount[130]==1 && nCount[310]==1 && nCount[211]==1 && nCount[-211]==1)
 48	_nKSKLpipi->fill();
 49      else if( ntotal==4 && nCount[310]==2 && nCount[211]==1 && nCount[-211]==1 )
 50	_nKSKSpipi->fill();
 51      else if( ntotal==4 && nCount[310]==2 && nCount[321]==1 && nCount[-321]==1)
 52	_nKSKSKpKm->fill();
 53
 54    }
 55
 56
 57    /// Normalise histograms etc., after the run
 58    void finalize() {
 59
 60      for(unsigned int ix=9;ix<13;++ix) {
 61	double sigma = 0., error = 0.;
 62	if(ix==9) {
 63	  sigma =  _nKSKL->val();
 64	  error =  _nKSKL->err();
 65	}
 66	else if(ix==10) {
 67	  sigma = _nKSKLpipi->val();
 68	  error = _nKSKLpipi->err();
 69	}
 70     	else if(ix==11) {
 71	  sigma = _nKSKSpipi->val();
 72	  error = _nKSKSpipi->err();
 73	}
 74     	else if(ix==12) {
 75	  sigma = _nKSKSKpKm->val();
 76	  error = _nKSKSKpKm->err();
 77	}
 78    	sigma *= crossSection()/ sumOfWeights() /nanobarn;
 79    	error *= crossSection()/ sumOfWeights() /nanobarn;
 80	Scatter2D temphisto(refData(ix, 1, 1));
 81	Scatter2DPtr  mult;
 82        book(mult, ix, 1, 1);
 83	for (size_t b = 0; b < temphisto.numPoints(); b++) {
 84	  const double x  = temphisto.point(b).x();
 85	  pair<double,double> ex = temphisto.point(b).xErrs();
 86	  pair<double,double> ex2 = ex;
 87	  if(ex2.first ==0.) ex2. first=0.0001;
 88	  if(ex2.second==0.) ex2.second=0.0001;
 89	  if (inRange(sqrtS()/GeV, x-ex2.first, x+ex2.second)) {
 90	    mult->addPoint(x, sigma, ex, make_pair(error,error));
 91	  }
 92	  else {
 93	    mult->addPoint(x, 0., ex, make_pair(0.,.0));
 94	  }
 95	}
 96      }
 97    }
 98
 99    //@}
100
101
102    /// @name Histograms
103    //@{
104    CounterPtr _nKSKL,_nKSKLpipi,_nKSKSpipi,_nKSKSKpKm;
105    //@}
106
107
108  };
109
110
111  // The hook for the plugin system
112  RIVET_DECLARE_PLUGIN(BABAR_2014_I1287920);
113
114
115}