// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief chi_c -> phi K K pi
class BESIII_2015_I1352828 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BESIII_2015_I1352828);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
UnstableParticles ufs = UnstableParticles(Cuts::pid==10441 or
Cuts::pid==20443 or
Cuts::pid==445);
declare(ufs, "UFS");
DecayedParticles chi(ufs);
chi.addStable( PID::PHI);
chi.addStable( PID::K0S);
chi.addStable( PID::PI0);
declare(chi, "chi");
// histos
for(unsigned int iy=0;iy<2;++iy)
for(unsigned int ix=0;ix<3;++ix)
book(_h[iy][ix],1,1+iy,1+ix);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> & mode1 = { { 333,1}, { 310,1}, { 321,1}, {-211,1} };
static const map<PdgId,unsigned int> & mode1CC = { { 333,1}, { 310,1}, {-321,1}, { 211,1} };
static const map<PdgId,unsigned int> & mode2 = { { 333,1}, { 321,1}, {-321,1}, { 111,1} };
DecayedParticles chi = apply<DecayedParticles>(event, "chi");
for(unsigned int ix=0;ix<chi.decaying().size();++ix) {
int imode = 0;
if(chi.modeMatches(ix,4,mode1) ||
chi.modeMatches(ix,4,mode1CC)) imode=0;
else if(chi.modeMatches(ix,4,mode2)) imode=1;
else continue;
unsigned int ichi = 0;
if (chi.decaying()[ix].pid()==20443) ichi=1;
else if(chi.decaying()[ix].pid()== 445) ichi=2;
const Particle & phi = chi.decayProducts()[ix].at(333)[0];
double mass = (chi.decaying()[ix].momentum()-phi.momentum()).mass();
_h[imode][ichi]->fill(mass);
}
}
/// Normalise histograms etc., after the run
void finalize() {
for(unsigned int iy=0;iy<2;++iy)
for(unsigned int ix=0;ix<3;++ix)
normalize(_h[iy][ix],1.,false);
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h[2][3];
/// @}
};
RIVET_DECLARE_PLUGIN(BESIII_2015_I1352828);
}