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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief Add a short analysis description here
class BELLE_2010_I841618 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2010_I841618);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
declare(UnstableParticles(), "UFS");
book(_h_3pi, 1, 1, 1);
book(_h_Kpipi, 2, 1, 1);
book(_h_KKpi, 3, 1, 1);
book(_h_3K, 4, 1, 1);
}
void findDecayProducts(const Particle & mother, unsigned int & nstable,
unsigned int & npip, unsigned int & npim,
unsigned int & nKp, unsigned int & nKm, FourMomentum & ptot) {
for(const Particle & p : mother.children()) {
int id = p.pid();
if ( id == PID::KPLUS ) {
++nKp;
++nstable;
ptot += p.momentum();
}
else if (id == PID::KMINUS ) {
++nKm;
++nstable;
ptot += p.momentum();
}
else if (id == PID::PIPLUS) {
++npip;
++nstable;
ptot += p.momentum();
}
else if (id == PID::PIMINUS) {
++npim;
++nstable;
ptot += p.momentum();
}
else if (id == PID::PI0 || id == PID::K0S) {
++nstable;
}
else if ( !p.children().empty() ) {
findDecayProducts(p, nstable, npip, npim, nKp, nKm,ptot);
}
else
++nstable;
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// Loop over taus
for(const Particle& tau : apply<UnstableParticles>(event, "UFS").particles(Cuts::abspid==PID::TAU)) {
unsigned int nstable(0),npip(0),npim(0),nKp(0),nKm(0);
FourMomentum p_tot(0,0,0,0);
findDecayProducts(tau, nstable, npip, npim, nKp, nKm, p_tot);
if (tau.pid() < 0) {
swap(npip, npim);
swap(nKp,nKm);
}
if(nstable!=4) continue;
if(npim==2 && npip==1 )
_h_3pi->fill(p_tot.mass());
else if(npim==1 && npip==1 && nKm==1)
_h_Kpipi->fill(p_tot.mass());
else if(nKm==1 && nKp==1 && npim==1)
_h_KKpi->fill(p_tot.mass());
else if(nKm==2 && nKp==1 )
_h_3K->fill(p_tot.mass());
}
}
/// Normalise histograms etc., after the run
void finalize() {
normalize(_h_3pi);
normalize(_h_Kpipi);
normalize(_h_KKpi);
normalize(_h_3K);
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_3pi, _h_Kpipi, _h_KKpi, _h_3K;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(BELLE_2010_I841618);
}
|