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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief p, Lambda, Lambda_c and Xi spectra at Upsilon(4s)
class CLEO_1992_I315181 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(CLEO_1992_I315181);
/// @name Analysis methods
///@{
/// Book histograms and initialise projections before the run
void init() {
declare(UnstableParticles(), "UFS");
book(_c_ups,"/TMP/c_ups");
book(_h_p ,1,1,1);
book(_h_Lambda_c,2,1,1);
book(_h_Lambda ,3,1,1);
book(_h_Xi ,4,1,1);
}
void findDecayProducts(Particle parent, Particles & protons, Particles & lambda_c, Particles & lambda, Particles & xi) {
for(const Particle & p : parent.children()) {
if (p.abspid() == PID::PROTON) {
protons.push_back(p);
continue;
}
else if(p.abspid()== PID::LAMBDA) {
lambda.push_back(p);
continue;
}
else if(p.abspid()== PID::XIMINUS) {
xi.push_back(p);
}
else if(p.abspid()== 4122) {
lambda_c.push_back(p);
}
if (!p.children().empty())
findDecayProducts(p,protons,lambda_c,lambda,xi);
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// Find the upsilons
for (const Particle& ups : apply<UnstableParticles>(event, "UFS").particles(Cuts::pid==300553)) {
_c_ups->fill();
Particles protons,lambda_c,lambda,xi;
findDecayProducts(ups,protons,lambda_c,lambda,xi);
LorentzTransform boost;
if (ups.p3().mod() > 1*MeV)
boost = LorentzTransform::mkFrameTransformFromBeta(ups.momentum().betaVec());
for(const Particle & p : protons) {
double pcm = boost.transform(p.momentum()).p3().mod();
_h_p->fill(pcm);
}
for(const Particle & p : lambda_c) {
double pcm = boost.transform(p.momentum()).p3().mod();
_h_Lambda_c->fill(pcm);
}
for(const Particle & p : lambda) {
double pcm = boost.transform(p.momentum()).p3().mod();
_h_Lambda->fill(pcm);
}
for(const Particle & p : xi) {
double pcm = boost.transform(p.momentum()).p3().mod();
_h_Xi->fill(pcm);
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
// br for lambda_c mode used (p K- pi+)
double br=0.0623;
scale(_h_p ,0.5 / *_c_ups);
scale(_h_Lambda_c,0.5*br/ *_c_ups);
scale(_h_Lambda ,0.5 / *_c_ups);
scale(_h_Xi ,0.5 / *_c_ups);
}
///@}
/// @name Histograms
///@{
CounterPtr _c_ups;
Histo1DPtr _h_p,_h_Lambda_c,_h_Lambda,_h_Xi;
///@}
};
RIVET_DECLARE_PLUGIN(CLEO_1992_I315181);
}
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