// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief Omega_c decays
class BELLE_2018_I1641071 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2018_I1641071);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
UnstableParticles ufs = UnstableParticles(Cuts::abspid==4332);
declare(ufs, "UFS");
DecayedParticles OMEGAC(ufs);
OMEGAC.addStable( PID::PI0);
OMEGAC.addStable( PID::K0S);
OMEGAC.addStable( PID::XIMINUS);
OMEGAC.addStable(-PID::XIMINUS);
OMEGAC.addStable( PID::XI0);
OMEGAC.addStable(-PID::XI0);
OMEGAC.addStable( PID::OMEGAMINUS);
OMEGAC.addStable(-PID::OMEGAMINUS);
declare(OMEGAC, "OMEGAC");
for(unsigned int ix=0;ix<4;++ix)
book(_h[ix],1,1,1+ix);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> & mode1 = { { 3334,1}, { 211,1}, { 111,1} };
static const map<PdgId,unsigned int> & mode1CC = { {-3334,1}, {-211,1}, { 111,1} };
static const map<PdgId,unsigned int> & mode2 = { { 3312,1}, {-321,1}, { 211,2} };
static const map<PdgId,unsigned int> & mode2CC = { {-3312,1}, { 321,1}, {-211,2} };
static const map<PdgId,unsigned int> & mode3 = { { 3322,1}, {-321,1}, { 211,1} };
static const map<PdgId,unsigned int> & mode3CC = { {-3322,1}, { 321,1}, {-211,1} };
DecayedParticles OMEGAC = apply<DecayedParticles>(event, "OMEGAC");
// loop over particles
for(unsigned int ix=0;ix<OMEGAC.decaying().size();++ix) {
int sign = OMEGAC.decaying()[ix].pid()/OMEGAC.decaying()[ix].abspid();
// omega pi+ pi0
if (( sign==1 && OMEGAC.modeMatches(ix,3,mode1 )) ||
( sign==-1 && OMEGAC.modeMatches(ix,3,mode1CC))) {
const Particle & pi0 = OMEGAC.decayProducts()[ix].at( 111)[0];
const Particle & pip = OMEGAC.decayProducts()[ix].at( sign*211 )[0];
_h[0]->fill((pi0.momentum()+pip.momentum()).mass());
}
// Xi- K- pi+pi+
else if (( sign==1 && OMEGAC.modeMatches(ix,4,mode2 )) ||
( sign==-1 && OMEGAC.modeMatches(ix,4,mode2CC))) {
const Particles & pip = OMEGAC.decayProducts()[ix].at( sign*211);
const Particle & Km = OMEGAC.decayProducts()[ix].at(-sign*321)[0];
const Particle & xim = OMEGAC.decayProducts()[ix].at(sign*3312)[0];
_h[1]->fill((xim.momentum()+pip[0].momentum()).mass());
_h[1]->fill((xim.momentum()+pip[1].momentum()).mass());
_h[2]->fill(( Km.momentum()+pip[0].momentum()).mass());
_h[2]->fill(( Km.momentum()+pip[1].momentum()).mass());
}
// Xi0 K- pi+
else if (( sign==1 && OMEGAC.modeMatches(ix,3,mode3 )) ||
( sign==-1 && OMEGAC.modeMatches(ix,3,mode3CC))) {
const Particle & pip = OMEGAC.decayProducts()[ix].at( sign*211)[0];
const Particle & Km = OMEGAC.decayProducts()[ix].at(-sign*321)[0];
_h[3]->fill(( Km.momentum()+pip.momentum()).mass());
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
for(unsigned int ix=0;ix<4;++ix)
normalize(_h[ix]);
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h[4];
/// @}
};
RIVET_DECLARE_PLUGIN(BELLE_2018_I1641071);
}