// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief Xi_c+ -> Sigma+ K- pi+
class CLEOII_1996_I397787 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(CLEOII_1996_I397787);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
UnstableParticles ufs = UnstableParticles(Cuts::abspid==4232);
declare(ufs, "UFS");
DecayedParticles XICP(ufs);
XICP.addStable(PID::PI0);
XICP.addStable(PID::K0S);
XICP.addStable(PID::ETA);
XICP.addStable(3222);
XICP.addStable(-3222);
declare(XICP, "XICP");
// 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,1}, { 3222,1}, { PID::PIPLUS ,1}};
static const map<PdgId,unsigned int> & modeCC = { { PID::KPLUS ,1}, {-3222,1}, { PID::PIMINUS,1}};
DecayedParticles XICP = apply<DecayedParticles>(event, "XICP");
// loop over particles
for(unsigned int ix=0;ix<XICP.decaying().size();++ix) {
int sign = 1;
if (XICP.decaying()[ix].pid()>0 && XICP.modeMatches(ix,3,mode)) {
sign=1;
}
else if (XICP.decaying()[ix].pid()<0 && XICP.modeMatches(ix,3,modeCC)) {
sign=-1;
}
else
continue;
const Particle & pip = XICP.decayProducts()[ix].at( sign*PID::PIPLUS)[0];
const Particle & Km = XICP.decayProducts()[ix].at( sign*PID::KMINUS)[0];
_h->fill((pip.momentum()+Km.momentum()).mass());
}
}
/// Normalise histograms etc., after the run
void finalize() {
normalize(_h);
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h;
/// @}
};
RIVET_DECLARE_PLUGIN(CLEOII_1996_I397787);
}