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- > Ds(*)+ Ds*()-
 10  class BELLE_2011_I878228 : public Analysis {
 11  public:
 12
 13    /// Constructor
 14    RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2011_I878228);
 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 histograms
 28      book(  _c_DpDm, "/TMP/sigma_DpDm"  );
 29      book( _c_DpDmS, "/TMP/sigma_DpDmS" );
 30      book(_c_DpSDmS, "/TMP/sigma_DpSDmS");
 31      book(   _c_All, "/TMP/sigma_All"   );
 32      book(    _c_mu, "/TMP/sigma_mu"    );
 33    }
 34
 35    void findChildren(const Particle & p,map<long,int> & nRes, int &ncount) {
 36      for(const Particle &child : p.children()) {
 37	if(child.children().empty()) {
 38	  nRes[child.pid()]-=1;
 39	  --ncount;
 40	}
 41	else
 42	  findChildren(child,nRes,ncount);
 43      }
 44    }
 45
 46    /// Perform the per-event analysis
 47    void analyze(const Event& event) {
 48      const FinalState& fs = apply<FinalState>(event, "FS");
 49      // total hadronic and muonic cross sections
 50      map<long,int> nCount;
 51      int ntotal(0);
 52      for (const Particle& p : fs.particles()) {
 53      	nCount[p.pid()] += 1;
 54      	++ntotal;
 55      }
 56      // mu+mu- + photons
 57      if(nCount[-13]==1 and nCount[13]==1 &&
 58      	 ntotal==2+nCount[22]) {
 59	_c_mu->fill();
 60	return;
 61      }
 62      // unstable charm analysis
 63
 64      Particles ds = apply<UnstableParticles>(event, "UFS").particles(Cuts::abspid==431 or Cuts::abspid==433);
 65      for(unsigned int ix=0;ix<ds.size();++ix) {
 66       	const Particle& p1 = ds[ix];
 67	int id1 = abs(p1.pid());
 68      	// check fs
 69      	bool fs = true;
 70      	for (const Particle & child : p1.children()) {
 71      	  if(child.pid()==p1.pid()) {
 72      	    fs = false;
 73      	    break;
 74      	  }
 75      	}
 76      	if(!fs) continue;
 77      	// find the children
 78      	map<long,int> nRes = nCount;
 79      	int ncount = ntotal;
 80      	findChildren(p1,nRes,ncount);
 81      	bool matched=false;
 82       	int sign = p1.pid()/id1;
 83	// loop over the other fs particles
 84	for(unsigned int iy=ix+1;iy<ds.size();++iy) {
 85	  const Particle& p2 = ds[iy];
 86	  fs = true;
 87	  for (const Particle & child : p2.children()) {
 88	    if(child.pid()==p2.pid()) {
 89	      fs = false;
 90	      break;
 91	    }
 92	  }
 93	  if(!fs) continue;
 94	  if(p2.pid()/abs(p2.pid())==sign) continue;
 95	  int id2 = abs(p2.pid());
 96	  if(!p2.parents().empty() && p2.parents()[0].pid()==p1.pid())
 97	    continue;
 98	  map<long,int> nRes2 = nRes;
 99	  int ncount2 = ncount;
100	  findChildren(p2,nRes2,ncount2);
101	  if(ncount2!=0) continue;
102	  matched=true;
103	  for(auto const & val : nRes2) {
104	    if(val.second!=0) {
105	      matched = false;
106	      break;
107	    }
108	  }
109	  if(matched) {
110	    if(id1==431 && id2==431) {
111	      _c_DpDm->fill();
112	    }
113	    else if(id1==433 && id2==433) {
114	      _c_DpSDmS->fill();
115	    }
116	    else if((id1==431 && id2==433) ||
117		    (id1==433 && id2==431)) {
118	      _c_DpDmS->fill();
119	    }
120	    _c_All->fill();
121	    break;
122	  }
123	}
124	if(matched) break;
125      }
126    }
127
128
129    /// Normalise histograms etc., after the run
130    void finalize() {
131      double fact = crossSection()/ sumOfWeights()/nanobarn;
132      for(unsigned int iy=1;iy<4;++iy) {
133        double sigma = 0.0, error = 0.0;
134        if(iy==1) {
135          sigma = _c_DpDm->val()*fact;
136          error = _c_DpDm->err()*fact;
137        }
138        else if(iy==2) {
139          sigma = _c_DpDmS->val()*fact;
140          error = _c_DpDmS->err()*fact;
141        }
142        else if(iy==3) {
143          sigma = _c_DpSDmS->val()*fact;
144          error = _c_DpSDmS->err()*fact;
145        }
146        Estimate1DPtr     mult;
147        book(mult, 1, 1, iy);
148        for (auto& b : mult->bins()) {
149          if (inRange(sqrtS()/GeV, b.xMin(), b.xMax())) {
150            b.set(sigma, error);
151          }
152        }
153      }
154      // R
155      if(_c_mu->val()==0. || _c_All->val()==0.) return;
156      Estimate0D R = *_c_All/ *_c_mu;
157      Estimate1DPtr mult;
158      book(mult, 2,1,1);
159      for (auto& b : mult->bins()) {
160        if (inRange(sqrtS()/GeV, b.xMin(), b.xMax())) {
161          b.set(R.val(), R.err());
162        }
163      }
164    }
165
166    /// @}
167
168
169    /// @name Histograms
170    /// @{
171    CounterPtr _c_DpDm,_c_DpDmS,_c_DpSDmS,_c_All,_c_mu;
172    /// @}
173
174
175  };
176
177
178  RIVET_DECLARE_PLUGIN(BELLE_2011_I878228);
179
180}