1// -*- C++ -*-
  2#include "Rivet/Analysis.hh"
  3#include "Rivet/Projections/UnstableParticles.hh"
  4#include "Rivet/Projections/DecayedParticles.hh"
  5
  6namespace Rivet {
  7
  8
  9  /// @brief B_c to ccbar + hadrons
 10  class LHCB_2022_I2138845 : public Analysis {
 11  public:
 12
 13    /// Constructor
 14    RIVET_DEFAULT_ANALYSIS_CTOR(LHCB_2022_I2138845);
 15
 16
 17    /// @name Analysis methods
 18    /// @{
 19
 20    /// Book histograms and initialise projections before the run
 21    void init() {
 22      UnstableParticles ufs = UnstableParticles(Cuts::abspid==541);
 23      declare(ufs, "UFS");
 24      DecayedParticles BC(ufs);
 25      BC.addStable( PID::PI0);
 26      BC.addStable( PID::K0S);
 27      BC.addStable( PID::JPSI);
 28      BC.addStable( PID::PSI2S);
 29      declare(BC, "BC");
 30      for(unsigned int ix=0;ix<3;++ix)
 31	book(_h[ix],1,1,1+ix);
 32      for(unsigned int ix=0;ix<2;++ix) {
 33	book(_h[ix+3],2,1,1+ix);
 34	book(_h[ix+5],3,1,1+ix);
 35	book(_h[ix+7],4,1,1+ix);
 36      }
 37    }
 38
 39
 40    /// Perform the per-event analysis
 41    void analyze(const Event& event) {
 42      static const map<PdgId,unsigned int> & mode1   = { { 443,1}, { 211,3}, {-211,2} };
 43      static const map<PdgId,unsigned int> & mode1CC = { { 443,1}, {-211,3}, { 211,2} };
 44      static const map<PdgId,unsigned int> & mode2   = { { 443,1}, { 321,1}, {-321,1}, { 211,2}, {-211,1} };
 45      static const map<PdgId,unsigned int> & mode2CC = { { 443,1}, { 321,1}, {-321,1}, {-211,2}, { 211,1} };
 46      static const map<PdgId,unsigned int> & mode3   = { { 443,1}, { 211,4}, {-211,3} };
 47      static const map<PdgId,unsigned int> & mode3CC = { { 443,1}, {-211,4}, { 211,3} };
 48      static const map<PdgId,unsigned int> & mode4   = { { 100443,1}, { 211,2}, {-211,1} };
 49      static const map<PdgId,unsigned int> & mode4CC = { { 100443,1}, {-211,2}, { 211,1} };
 50      DecayedParticles BC = apply<DecayedParticles>(event, "BC");
 51      // loop over particles
 52      for(unsigned int ix=0;ix<BC.decaying().size();++ix) {
 53	int sign = BC.decaying()[ix].pid()/BC.decaying()[ix].abspid();
 54	if ((sign== 1 && BC.modeMatches(ix,6,mode1  )) ||
 55	    (sign==-1 && BC.modeMatches(ix,6,mode1CC))) {
 56	  const Particles & pim = BC.decayProducts()[ix].at(-sign*211);
 57	  const Particles & pip = BC.decayProducts()[ix].at( sign*211);
 58	  FourMomentum ptotal=pim[0].momentum()+pim[1].momentum()+
 59	    pip[0].momentum()+pip[1].momentum()+pip[2].momentum();
 60	  _h[0]->fill(ptotal.mass());
 61	  for(unsigned int ix=0;ix<3;++ix)
 62	    for(unsigned int iy=0;iy<2;++iy) {
 63	      FourMomentum prho=pip[ix].momentum()+pim[iy].momentum();
 64	      _h[3]->fill((ptotal-prho).mass());
 65	      _h[5]->fill(prho.mass());
 66	    }
 67	}
 68	else if ((sign== 1 && BC.modeMatches(ix,6,mode2  )) ||
 69		 (sign==-1 && BC.modeMatches(ix,6,mode2CC))) {
 70	  const Particles & pim = BC.decayProducts()[ix].at(-sign*211);
 71	  const Particles & pip = BC.decayProducts()[ix].at( sign*211);
 72	  const Particle  & Kp  = BC.decayProducts()[ix].at( sign*321)[0];
 73	  const Particle  & Km  = BC.decayProducts()[ix].at(-sign*321)[0];
 74	  _h[1]->fill((Kp.momentum()+Km.momentum()+pim[0].momentum()+
 75		       pip[0].momentum()+pip[1].momentum()).mass());
 76	  _h[7]->fill((Kp.momentum()+pim[0].momentum()).mass());
 77	  _h[7]->fill((Km.momentum()+pip[0].momentum()).mass());
 78	  _h[7]->fill((Km.momentum()+pip[1].momentum()).mass());
 79	  _h[8]->fill((Kp.momentum()+Km.momentum()).mass());
 80	}
 81	else if ((sign== 1 && BC.modeMatches(ix,8,mode3  )) ||
 82		 (sign==-1 && BC.modeMatches(ix,8,mode3CC))) {
 83	  const Particles & pim = BC.decayProducts()[ix].at(-sign*211);
 84	  const Particles & pip = BC.decayProducts()[ix].at( sign*211);
 85	  _h[2]->fill((pim[0].momentum()+pim[1].momentum()+pim[2].momentum()+
 86		       pip[0].momentum()+pip[1].momentum()+pip[2].momentum()+pip[3].momentum()).mass());
 87	}
 88	else if ((sign== 1 && BC.modeMatches(ix,4,mode4  )) ||
 89		 (sign==-1 && BC.modeMatches(ix,4,mode4CC))) {
 90	  const Particles & pim = BC.decayProducts()[ix].at(-sign*211);
 91	  const Particles & pip = BC.decayProducts()[ix].at( sign*211);
 92	  _h[4]->fill((pim[0].momentum()+
 93		       pip[0].momentum()+pip[1].momentum()).mass());
 94	  for(unsigned int iy=0;iy<2;++iy)
 95	    _h[6]->fill((pim[0].momentum()+pip[ix].momentum()).mass());
 96	}
 97      }
 98    }
 99
100
101    /// Normalise histograms etc., after the run
102    void finalize() {
103      for(unsigned int ix=0;ix<9;++ix)
104	normalize(_h[ix],1.,false);
105    }
106
107    /// @}
108
109
110    /// @name Histograms
111    /// @{
112    Histo1DPtr _h[9];
113    /// @}
114
115
116  };
117
118
119  RIVET_DECLARE_PLUGIN(LHCB_2022_I2138845);
120
121}