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103 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief Lambda_c+ -> p 2K0S and p K0S eta
class BELLE_2022_I2160445 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2022_I2160445);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
UnstableParticles ufs = UnstableParticles(Cuts::abspid==4122);
declare(ufs, "UFS");
DecayedParticles LAMBDAC(ufs);
LAMBDAC.addStable(PID::PI0);
LAMBDAC.addStable(PID::K0S);
LAMBDAC.addStable(PID::ETA);
declare(LAMBDAC, "LAMBDAC");
// histograms
for(unsigned int ix=0;ix<2;++ix)
for(unsigned int iy=0;iy<2+ix;++iy)
book(_h[ix][iy],1+ix,1,1+iy);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> & mode1 = { { PID::PROTON,1}, {310,2}};
static const map<PdgId,unsigned int> & mode1CC = { {-PID::PROTON,1}, {310,2}};
static const map<PdgId,unsigned int> & mode2 = { { PID::PROTON,1}, {310,1}, { 221,1}};
static const map<PdgId,unsigned int> & mode2CC = { {-PID::PROTON,1}, {310,1}, { 221,1}};
DecayedParticles LAMBDAC = apply<DecayedParticles>(event, "LAMBDAC");
// loop over particles
for(unsigned int ix=0;ix<LAMBDAC.decaying().size();++ix) {
int sign = 1, mode=-1;
if (LAMBDAC.decaying()[ix].pid()>0 && LAMBDAC.modeMatches(ix,3,mode1)) {
sign=1;
mode=0;
}
else if (LAMBDAC.decaying()[ix].pid()<0 && LAMBDAC.modeMatches(ix,3,mode1CC)) {
sign=-1;
mode=0;
}
else if (LAMBDAC.decaying()[ix].pid()>0 && LAMBDAC.modeMatches(ix,3,mode2)) {
sign=1;
mode=1;
}
else if (LAMBDAC.decaying()[ix].pid()<0 && LAMBDAC.modeMatches(ix,3,mode2CC)) {
sign=-1;
mode=1;
}
else
continue;
const Particle & pp = LAMBDAC.decayProducts()[ix].at( sign*PID::PROTON)[0];
const Particles & K0 = LAMBDAC.decayProducts()[ix].at( 310);
if(mode==0) {
_h[0][0]->fill((pp .momentum()+K0[0].momentum()).mass2());
_h[0][0]->fill((pp .momentum()+K0[1].momentum()).mass2());
_h[0][1]->fill((K0[0].momentum()+K0[1].momentum()).mass2());
}
else {
const Particle & eta = LAMBDAC.decayProducts()[ix].at( 221)[0];
_h[1][0]->fill((K0[0].momentum()+eta.momentum()).mass2());
_h[1][1]->fill((pp.momentum()+ K0[0].momentum()).mass2());
_h[1][2]->fill((pp.momentum()+eta.momentum()).mass2());
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
for(unsigned int ix=0;ix<2;++ix)
for(unsigned int iy=0;iy<2+ix;++iy)
normalize(_h[ix][iy],1.,false);
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h[2][3];
/// @}
};
RIVET_DECLARE_PLUGIN(BELLE_2022_I2160445);
}
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