// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief Xi_c0 -> p K- K- pi+
class CLEOIII_2004_I627327 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(CLEOIII_2004_I627327);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
UnstableParticles ufs = UnstableParticles(Cuts::abspid==4132);
declare(ufs, "UFS");
DecayedParticles XIC0(ufs);
XIC0.addStable(PID::PI0);
XIC0.addStable(PID::K0S);
XIC0.addStable(PID::ETA);
declare(XIC0, "XIC0");
// histograms
book(_h,1,1,1);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> & mode = { { PID::KMINUS,2}, { 2212,1}, { PID::PIPLUS ,1}};
static const map<PdgId,unsigned int> & modeCC = { { PID::KPLUS ,2}, {-2212,1}, { PID::PIMINUS,1}};
DecayedParticles XIC0 = apply<DecayedParticles>(event, "XIC0");
// loop over particles
for(unsigned int ix=0;ix<XIC0.decaying().size();++ix) {
int sign = 1;
if (XIC0.decaying()[ix].pid()>0 && XIC0.modeMatches(ix,4,mode)) {
sign=1;
}
else if (XIC0.decaying()[ix].pid()<0 && XIC0.modeMatches(ix,4,modeCC)) {
sign=-1;
}
else
continue;
const Particle & pip = XIC0.decayProducts()[ix].at( sign*PID::PIPLUS)[0];
const Particles & Km = XIC0.decayProducts()[ix].at( sign*PID::KMINUS);
for(unsigned int ix=0;ix<2;++ix)
_h->fill((pip.momentum()+Km[ix].momentum()).mass());
}
}
/// Normalise histograms etc., after the run
void finalize() {
normalize(_h,1.,false);
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h;
/// @}
};
RIVET_DECLARE_PLUGIN(CLEOIII_2004_I627327);
}