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 BABAR_2010_I864027 : public Analysis {
 11  public:
 12
 13    /// Constructor
 14    RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2010_I864027);
 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    }
 32
 33    void findChildren(const Particle & p,map<long,int> & nRes, int &ncount) {
 34      for(const Particle &child : p.children()) {
 35	if(child.children().empty()) {
 36	  nRes[child.pid()]-=1;
 37	  --ncount;
 38	}
 39	else
 40	  findChildren(child,nRes,ncount);
 41      }
 42    }
 43
 44    /// Perform the per-event analysis
 45    void analyze(const Event& event) {
 46      const FinalState& fs = apply<FinalState>(event, "FS");
 47      // total hadronic and muonic cross sections
 48      map<long,int> nCount;
 49      int ntotal(0);
 50      for (const Particle& p : fs.particles()) {
 51      	nCount[p.pid()] += 1;
 52      	++ntotal;
 53      }
 54      // unstable charm analysis
 55      Particles ds = apply<UnstableParticles>(event, "UFS").particles(Cuts::abspid==431 or Cuts::abspid==433);
 56      for(unsigned int ix=0;ix<ds.size();++ix) {
 57       	const Particle& p1 = ds[ix];
 58	int id1 = abs(p1.pid());
 59      	// check fs
 60      	bool fs = true;
 61      	for (const Particle & child : p1.children()) {
 62      	  if(child.pid()==p1.pid()) {
 63      	    fs = false;
 64      	    break;
 65      	  }
 66      	}
 67      	if(!fs) continue;
 68      	// find the children
 69      	map<long,int> nRes = nCount;
 70      	int ncount = ntotal;
 71      	findChildren(p1,nRes,ncount);
 72      	bool matched=false;
 73       	int sign = p1.pid()/id1;
 74	// loop over the other fs particles
 75	for(unsigned int iy=ix+1;iy<ds.size();++iy) {
 76	  const Particle& p2 = ds[iy];
 77	  fs = true;
 78	  for (const Particle & child : p2.children()) {
 79	    if(child.pid()==p2.pid()) {
 80	      fs = false;
 81	      break;
 82	    }
 83	  }
 84	  if(!fs) continue;
 85	  if(p2.pid()/abs(p2.pid())==sign) continue;
 86	  int id2 = abs(p2.pid());
 87	  if(!p2.parents().empty() && p2.parents()[0].pid()==p1.pid())
 88	    continue;
 89	  map<long,int> nRes2 = nRes;
 90	  int ncount2 = ncount;
 91	  findChildren(p2,nRes2,ncount2);
 92	  if(ncount2!=0) continue;
 93	  matched=true;
 94	  for(auto const & val : nRes2) {
 95	    if(val.second!=0) {
 96	      matched = false;
 97	      break;
 98	    }
 99	  }
100	  if(matched) {
101	    if(id1==431 && id2==431) {
102	      _c_DpDm->fill();
103	    }
104	    else if(id1==433 && id2==433) {
105	      _c_DpSDmS->fill();
106	    }
107	    else if((id1==431 && id2==433) ||
108		    (id1==433 && id2==431)) {
109	      _c_DpDmS->fill();
110	    }
111	    break;
112	  }
113	}
114	if(matched) break;
115      }
116    }
117
118
119    /// Normalise histograms etc., after the run
120    void finalize() {
121      double fact = crossSection()/ sumOfWeights()/nanobarn;
122      for(unsigned int iy=1;iy<4;++iy) {
123	double sigma = 0.0, error = 0.0;
124	if(iy==1) {
125	  sigma = _c_DpDm->val()*fact;
126	  error = _c_DpDm->err()*fact;
127	}
128	else if(iy==2) {
129	  sigma = _c_DpDmS->val()*fact;
130	  error = _c_DpDmS->err()*fact;
131	}
132	else if(iy==3) {
133	  sigma = _c_DpSDmS->val()*fact;
134	  error = _c_DpSDmS->err()*fact;
135	}
136        Estimate1DPtr     mult;
137        book(mult, 1, 1, iy);
138        for (auto& b : mult->bins()) {
139          if (inRange(sqrtS()/GeV, b.xMin(), b.xMax())) {
140            b.set(sigma, error);
141          }
142        }
143      }
144    }
145
146    /// @}
147
148
149    /// @name Histograms
150    /// @{
151    CounterPtr _c_DpDm,_c_DpDmS,_c_DpSDmS;
152    /// @}
153
154
155  };
156
157
158  RIVET_DECLARE_PLUGIN(BABAR_2010_I864027);
159
160}