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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief phi spectrum at Upsilon 4 and 5s
class CLEO_2007_I728872 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(CLEO_2007_I728872);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(UnstableParticles(), "UFS");
// Book histograms
book(_h_4S, 1, 1, 5);
book(_h_5S, 2, 1, 5);
book(_c_4S, "/TMP/N4S");
book(_c_5S, "/TMP/N5S");
}
void findDecayProducts(const Particle & p, Particles & phi) {
for(const Particle & child : p.children()) {
if(child.pid()==333)
phi.push_back(child);
else if(!child.children().empty())
findDecayProducts(child,phi);
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// Find the Upsilons among the unstables
const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
Particles upsilons = ufs.particles(Cuts::pid==300553 || Cuts::pid==400553|| Cuts::pid==9000553);
for (const Particle& ups : upsilons) {
LorentzTransform cms_boost;
if (ups.p3().mod() > 1*MeV)
cms_boost = LorentzTransform::mkFrameTransformFromBeta(ups.momentum().betaVec());
Particles phis;
findDecayProducts(ups, phis);
if(ups.pid()==300553)
_c_4S->fill();
else
_c_5S->fill();
for(const Particle & phi : phis) {
FourMomentum p2 = cms_boost.transform(phi.momentum());
double x = 2.*p2.p3().mod()/ups.mass();
if(ups.pid()==300553)
_h_4S->fill(x);
else
_h_5S->fill(x);
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
if(_h_4S->effNumEntries()!=0)
scale(_h_4S ,100./ *_c_4S);
if(_h_5S->effNumEntries()!=0)
scale(_h_5S ,100./ *_c_5S);
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_4S,_h_5S;
CounterPtr _c_4S,_c_5S;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(CLEO_2007_I728872);
}
|