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BELLE_2015_I1324785

Cross section for $e^+e^-\to \psi(2S)\pi^+\pi^-$ at energies between 4.0 and 5.5 GeV
Experiment: BELLE (KEKB)
Inspire ID: 1324785
Status: VALIDATED
Authors:
  • Peter Richardson
References:
  • Phys.Rev. D91 (2015) 112007, 2015
Beams: e+ e-
Beam energies: ANY
Run details:
  • e+e- to hadrons

Measurement of the cross section for $e^+e^-\to \psi(2S)\pi^+\pi^-$ at energies between 4.0 and 5.5 GeV using radiative return by BELLE.

Source code: BELLE_2015_I1324785.cc
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// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {


  /// @brief Add a short analysis description here
  class BELLE_2015_I1324785 : public Analysis {
  public:

    /// Constructor
    DEFAULT_RIVET_ANALYSIS_CTOR(BELLE_2015_I1324785);


    /// @name Analysis methods
    //@{

    /// Book histograms and initialise projections before the run
    void init() {
      declare(FinalState(), "FS");
      declare(UnstableParticles(), "UFS");
      book(_nPsi2s, "TMP/psi2s");
    }

    void findChildren(const Particle & p,map<long,int> & nRes, int &ncount) {
      for (const Particle &child : p.children()) {
	if(child.children().empty()) {
	  --nRes[child.pid()];
	  --ncount;
	}
	else
	  findChildren(child,nRes,ncount);
      }
    }

    /// Perform the per-event analysis
    void analyze(const Event& event) {
      const FinalState& fs = apply<FinalState>(event, "FS");
      map<long,int> nCount;
      int ntotal(0);
      for (const Particle& p : fs.particles()) {
	nCount[p.pid()] += 1;
	++ntotal;
      }
      const FinalState& ufs = apply<FinalState>(event, "UFS");
      for (const Particle& p : ufs.particles()) {
	if(p.children().empty()) continue;
	// find the psi(2S)
	if(p.pid()==100443) {
	  map<long,int> nRes = nCount;
	  int ncount = ntotal;
	  findChildren(p,nRes,ncount);
	  // omega pi+pi-
	  if(ncount!=2) continue;
	  bool matched = true;
	  for(auto const & val : nRes) {
	    if(abs(val.first)==211) {
	      if(val.second !=1) {
		matched = false;
		break;
	      }
	    }
	    else if(val.second!=0) {
	      matched = false;
	      break;
	    }
	  }
	  if(matched) {
	    _nPsi2s->fill();
	    break;
	  }
	}
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      double sigma =  _nPsi2s->val();
      double error = _nPsi2s->err();
      sigma *= crossSection()/ sumOfWeights() /picobarn;
      error *= crossSection()/ sumOfWeights() /picobarn; 
      Scatter2D temphisto(refData(1, 1, 1));
      Scatter2DPtr  mult;
      book(mult, 1, 1, 1);
      for (size_t b = 0; b < temphisto.numPoints(); b++) {
	const double x  = temphisto.point(b).x();
	pair<double,double> ex = temphisto.point(b).xErrs();
	pair<double,double> ex2 = ex;
	if(ex2.first ==0.) ex2. first=0.0001;
	if(ex2.second==0.) ex2.second=0.0001;
	if (inRange(sqrtS()/GeV, x-ex2.first, x+ex2.second)) {
	  mult->addPoint(x, sigma, ex, make_pair(error,error));
	}
	else {
	  mult->addPoint(x, 0., ex, make_pair(0.,.0));
	}
      }
    }

    //@}


    /// @name Histograms
    //@{
    CounterPtr _nPsi2s;
    //@}


  };


  // The hook for the plugin system
  DECLARE_RIVET_PLUGIN(BELLE_2015_I1324785);


}