// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief D0 -> K+ K- pi+ pi-
class CLEO_2012_I1086166 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(CLEO_2012_I1086166);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
UnstableParticles ufs = UnstableParticles(Cuts::abspid==421);
declare(ufs, "UFS");
DecayedParticles D0(ufs);
D0.addStable(PID::PI0);
D0.addStable(PID::K0S);
D0.addStable(PID::ETA);
D0.addStable(PID::ETAPRIME);
declare(D0, "D0");
// histograms
for(unsigned int ix=0;ix<6;++ix)
book(_h[ix],1,1,1+ix);
for(unsigned int ix=0;ix<4;++ix)
book(_h[ix+6],2,1,1+ix);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// define the decay mode
static const map<PdgId,unsigned int> & mode = { { 321,1},{ -321,1}, { 211,1}, { -211,1}};
DecayedParticles D0 = apply<DecayedParticles>(event, "D0");
// loop over particles
for(unsigned int ix=0;ix<D0.decaying().size();++ix) {
if ( !D0.modeMatches(ix,4,mode)) continue;
int sign = D0.decaying()[ix].pid()/421;
const Particles & Kp = D0.decayProducts()[ix].at( sign*321);
const Particles & Km = D0.decayProducts()[ix].at(-sign*321);
const Particles & pip= D0.decayProducts()[ix].at( sign*211);
const Particles & pim= D0.decayProducts()[ix].at(-sign*211);
_h[0]->fill((Kp [0].momentum()+Km [0].momentum()).mass2());
_h[1]->fill((Kp [0].momentum()+pip[0].momentum()).mass2());
_h[2]->fill((Kp [0].momentum()+pim[0].momentum()).mass2());
_h[3]->fill((Km [0].momentum()+pip[0].momentum()).mass2());
_h[4]->fill((Km [0].momentum()+pim[0].momentum()).mass2());
_h[5]->fill((pip[0].momentum()+pim[0].momentum()).mass2());
_h[6]->fill((Kp [0].momentum()+Km [0].momentum()+pip[0].momentum()).mass2());
_h[7]->fill((Kp [0].momentum()+Km [0].momentum()+pim[0].momentum()).mass2());
_h[8]->fill((Kp [0].momentum()+pip[0].momentum()+pim[0].momentum()).mass2());
_h[9]->fill((Km [0].momentum()+pip[0].momentum()+pim[0].momentum()).mass2());
}
}
/// Normalise histograms etc., after the run
void finalize() {
for(unsigned int ix=0;ix<10;++ix)
normalize(_h[ix],1.,false);
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h[10];
/// @}
};
RIVET_DECLARE_PLUGIN(CLEO_2012_I1086166);
}