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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief Charged particle multplicity in Upsilon 4s decays
class CLEOII_1999_I504672 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(CLEOII_1999_I504672);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(UnstableParticles(), "UFS");
// Book histograms
book(_n_tot , 1, 1, 1);
book(_n_lep , 1, 1, 2);
book(_n_nolep, 1, 1, 3);
book(_h_n , 2, 1, 1);
book(_n_Ups_All ,"/TMP/n_Ups_All");
book(_n_Ups_Lep ,"/TMP/n_Ups_Lep");
book(_n_Ups_NoLep,"/TMP/n_Ups_NoLep");
}
void findChildren(const Particle & p,int & nCharged, int & nLep) {
bool isBottom = PID::isBottomHadron(p.pid());
for( const Particle &child : p.children()) {
if(child.children().empty()) {
if(PID::isCharged(child.pid()) ) ++nCharged;
if(isBottom && (child.abspid()==11||child.abspid()==13)) ++nLep;
}
else
findChildren(child,nCharged,nLep);
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
for (const Particle& p : apply<FinalState>(event, "UFS").particles(Cuts::pid==300553)) {
_n_Ups_All->fill();
int nCharged(0),nLep(0);
findChildren(p,nCharged,nLep);
_h_n->fill(nCharged);
_n_tot->fill(10.1,nCharged);
if(nLep==2) {
_n_lep ->fill(10.1,nCharged);
_n_Ups_Lep->fill();
}
else {
_n_nolep->fill(10.1,nCharged);
_n_Ups_NoLep->fill();
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_h_n , 1./ *_n_Ups_All );
scale(_n_tot , 1./ *_n_Ups_All );
scale(_n_lep , 1./ *_n_Ups_Lep );
scale(_n_nolep, 1./ *_n_Ups_NoLep);
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_n;
Histo1DPtr _n_tot,_n_lep,_n_nolep;
CounterPtr _n_Ups_All,_n_Ups_Lep,_n_Ups_NoLep;
//@}
};
RIVET_DECLARE_PLUGIN(CLEOII_1999_I504672);
}
|