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BESII_2007_I763880

Cross sections for light hadrons at 3.773 and 3.650 GeV
Experiment: BESII (BEPC)
Inspire ID: 763880
Status: VALIDATED
Authors:
  • Peter Richardson
References:
  • Phys.Lett. B670 (2008) 184-189, 2008
Beams: e+ e-
Beam energies: ANY
Run details:
  • e+e- to hadrons

Cross section for $e^+e^-\to \omega \pi^+\pi^-$, $\omega K^+K^-$, $\omega p\bar{p}$, $K^+K^-\rho^0\pi^0$, $K^+K^-\rho^+\pi^-+\text{c.c.}$, $K^{*0}K^-\pi^+\pi^0+\text{c.c.}$ and $K^{*+}K^-\pi^+\pi^-+\text{c.c.}$ at 3.773 and 3.650 GeV.

Source code: BESII_2007_I763880.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 BESII_2007_I763880 : public Analysis {
  public:

    /// Constructor
    DEFAULT_RIVET_ANALYSIS_CTOR(BESII_2007_I763880);


    /// @name Analysis methods
    //@{

    /// Book histograms and initialise projections before the run
    void init() {

      // Initialise and register projections
      declare(FinalState(), "FS");
      declare(UnstableParticles(), "UFS");

      // Book histograms
      for(unsigned int ix=1;ix<8;++ix) {
	stringstream ss;
	ss << "TMP/n" << ix;
	book(_nMeson[ix], ss.str());
      }
    }

    void findChildren(const Particle & p,map<long,int> & nRes, int &ncount) {
      for (const Particle &child : p.children()) {
	if(child.children().empty()) {
	  nRes[child.pid()]-=1;
	  --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;
	if(p.pid()!=223 && p.pid()!=113&&abs(p.pid())!=313&& abs(p.pid())!=323)
	  continue;
	map<long,int> nRes = nCount;
	int ncount = ntotal;
	findChildren(p,nRes,ncount);
	if(p.pid()==113) {
	  if(ncount!=3) continue;
	  unsigned int npi(0),nK(0);
	  bool matched = true;
	  for(auto const & val : nRes) {
	    if(abs(val.first)==111 && val.second==1) {
	      npi+=1;
	    }
	    else if(abs(val.first)==321 && val.second==1) {
	      nK+=1;
	    }
	    else if(val.second!=0) {
	      matched = false;
	      break;
	    }
	  }
	  if(matched) {
	    if(npi==1&&nK==2)
	      _nMeson[4]->fill();
	  }
	}
	else if(abs(p.pid())==213) {
	  if(ncount!=3) continue;
	  unsigned int npi(0),nK(0);
	  bool matched = true;
	  int ipi = p.pid()==213 ? -211 : 211;
	  for(auto const & val : nRes) {
	    if(abs(val.first)== ipi && val.second==1) {
	      npi+=1;
	    }
	    else if(abs(val.first)==321 && val.second==1) {
	      nK+=1;
	    }
	    else if(val.second!=0) {
	      matched = false;
	      break;
	    }
	  }
	  if(matched) {
	    if(npi==1&&nK==2)
	      _nMeson[5]->fill();
	  }
	}
	else if(abs(p.pid())==313) {
	  if(ncount!=3) continue;
	  unsigned int npi(0),nK(0),npi0(0);
	  bool matched = true;
	  int ipi = p.pid()==313 ?  211 : -211;
	  int iK  = p.pid()==313 ? -321 :  321;
	  for(auto const & val : nRes) {
	    if(abs(val.first)== ipi && val.second==1) {
	      npi+=1;
	    }
	    else if(abs(val.first)==iK && val.second==1) {
	      nK+=1;
	    }
	    if(abs(val.first)== 111 && val.second==1) {
	      npi0+=1;
	    }
	    else if(val.second!=0) {
	      matched = false;
	      break;
	    }
	  }
	  if(matched) {
	    if(npi==1&&nK==1&&npi0==1)
	      _nMeson[6]->fill();
	  }
	}
	else if(abs(p.pid())==323) {
	  if(ncount!=3) continue;
	  unsigned int npi(0),nK(0),npi0(0);
	  bool matched = true;
	  int ipi = p.pid()==323 ?  211 : -211;
	  int iK  = p.pid()==323 ? -321 :  321;
	  for(auto const & val : nRes) {
	    if(abs(val.first)== ipi && val.second==1) {
	      npi+=1;
	    }
	    else if(abs(val.first)==iK && val.second==1) {
	      nK+=1;
	    }
	    if(abs(val.first)== 111 && val.second==1) {
	      npi0+=1;
	    }
	    else if(val.second!=0) {
	      matched = false;
	      break;
	    }
	  }
	  if(matched) {
	    if(npi==1&&nK==1&&npi0==1)
	      _nMeson[7]->fill();
	  }
	}
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      for(unsigned int ix=4;ix<8;++ix) {
	double sigma = _nMeson[ix]->val();
	double error = _nMeson[ix]->err();
    	sigma *= crossSection()/ sumOfWeights() /nanobarn;
    	error *= crossSection()/ sumOfWeights() /nanobarn;
	Scatter2D temphisto(refData(1, 1, ix));
	Scatter2DPtr  mult;
        book(mult, 1, 1, ix);
	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 _nMeson[8];
    //@}


  };


  // The hook for the plugin system
  DECLARE_RIVET_PLUGIN(BESII_2007_I763880);


}