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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief Electron spectrum in D decays
class CLEOC_2006_I715096 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(CLEOC_2006_I715096);
/// @name Analysis methods
///@{
/// Book histograms and initialise projections before the run
void init() {
// projections
declare(UnstableParticles(),"UFS");
// Book histograms
// specify custom binning
book(_h_Dp, 1,1,1);
book(_h_D0, 1,1,2);
}
void findDecayProducts(Particle parent, Particles & em, Particles & ep,
Particles & nue, Particles & nueBar) {
for(const Particle & p : parent.children()) {
if(p.pid() == PID::EMINUS) {
em.push_back(p);
}
else if(p.pid() == PID::EPLUS) {
ep.push_back(p);
}
else if(p.pid() == PID::NU_E) {
nue.push_back(p);
}
else if(p.pid() == PID::NU_EBAR) {
nueBar.push_back(p);
}
else if(PID::isCharmHadron(p.pid())) {
findDecayProducts(p,em,ep,nue,nueBar);
}
else if(!PID::isHadron(p.pid())) {
findDecayProducts(p,em,ep,nue,nueBar);
}
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// find and loop over psi(3770)
const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
for (const Particle& p : ufs.particles(Cuts::pid==30443)) {
// boost to rest frame
LorentzTransform boost;
if (p.p3().mod() > 1*MeV)
boost = LorentzTransform::mkFrameTransformFromBeta(p.momentum().betaVec());
// loop over decay products
for(const Particle & p2 : p.children()) {
if(p2.abspid()==411 || p2.abspid()==421) {
Particles em,ep,nue,nueBar;
findDecayProducts(p2,em,ep,nue,nueBar);
if(em.size()==1 && nueBar.size()==1) {
double pmod = boost.transform(em[0].momentum()).p3().mod();
if(p2.abspid()==411) _h_Dp->fill(pmod);
else _h_D0->fill(pmod);
}
else if(ep.size()==1 && nue.size()==1) {
double pmod = boost.transform(ep[0].momentum()).p3().mod();
if(p2.abspid()==411) _h_Dp->fill(pmod);
else _h_D0->fill(pmod);
}
}
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
normalize(_h_D0);
normalize(_h_Dp);
}
///@}
/// @name Histograms
///@{
Histo1DPtr _h_Dp,_h_D0;
///@}
};
RIVET_DECLARE_PLUGIN(CLEOC_2006_I715096);
}
|