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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief Add a short analysis description here
class CLEOII_1994_I356001 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(CLEOII_1994_I356001);
/// @name Analysis methods
///@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(UnstableParticles(),"UFS");
// Histograms
book(_n_2S,"/TMP/n_2S");
book(_n_3S,"/TMP/n_3S");
book(_h_3S_1S_neutral,1,1,1);
book(_h_3S_2S_neutral,1,1,2);
book(_h_3S_1S_ex ,2,1,1);
book(_h_3S_1S_in ,2,1,2);
book(_h_3S_2S_ex ,3,1,1);
book(_h_3S_2S_in ,3,1,2);
book(_h_2S_1S_ex ,4,1,1);
book(_h_2S_1S_in ,4,1,2);
}
void findDecayProducts(const Particle & mother,
unsigned int & nstable,
Particles& pip, Particles& pim,
Particles& pi0, Particles & onium) {
for(const Particle & p : mother.children()) {
int id = p.pid();
if ( id == PID::PIMINUS) {
pim.push_back(p);
++nstable;
}
else if (id == PID::PIPLUS) {
pip.push_back(p);
++nstable;
}
else if (id == PID::PI0) {
pi0.push_back(p);
++nstable;
}
else if (abs(id)%1000==553) {
onium.push_back(p);
++nstable;
}
else if ( !p.children().empty() ) {
findDecayProducts(p,nstable,pip,pim,pi0,onium);
}
else
++nstable;
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// loop over unstable particles
for(const Particle& ups : apply<UnstableParticles>(event, "UFS").particles(Cuts::pid==100553 or
Cuts::pid==200553)) {
if(ups.pid()==200553)
_n_3S->fill();
else
_n_2S->fill();
unsigned int nstable(0);
Particles pip, pim, pi0, onium;
findDecayProducts(ups,nstable,pip,pim,pi0,onium);
// check for onium
if(onium.size() !=1 || nstable !=3) continue;
//pi+pi-
if( pip.size()==1 && pim.size() ==1) {
double q = (pip[0].momentum()+pim[0].momentum()).mass();
if(ups.pid()==200553 && onium[0].pid()==553) {
_h_3S_1S_ex->fill(q);
_h_3S_1S_in->fill(q);
}
else if(ups.pid()==200553 && onium[0].pid()==100553) {
_h_3S_2S_ex->fill(q);
_h_3S_2S_in->fill(q);
}
else if(ups.pid()==100553 && onium[0].pid()==553) {
_h_2S_1S_ex->fill(q);
_h_2S_1S_in->fill(q);
}
}
else if(pi0.size()==2) {
double q = (pi0[0].momentum()+pi0[1].momentum()).mass();
if(ups.pid()==200553 && onium[0].pid()==553) {
_h_3S_1S_neutral->fill(q);
}
else if(ups.pid()==200553 && onium[0].pid()==100553) {
_h_3S_2S_neutral->fill(q);
}
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
// widths of Upsilon 2S and 3S
vector<double> width = {31.98,20.32};
scale(_h_3S_2S_neutral, width[1]/ *_n_3S);
scale(_h_3S_1S_neutral, width[1]/ *_n_3S);
scale(_h_3S_2S_ex , width[1]/ *_n_3S);
scale(_h_3S_2S_in , width[1]/ *_n_3S);
scale(_h_3S_1S_ex , width[1]/ *_n_3S);
scale(_h_3S_1S_in , width[1]/ *_n_3S);
scale(_h_2S_1S_ex , width[0]/ *_n_2S);
scale(_h_2S_1S_in , width[0]/ *_n_2S);
}
///@}
/// @name Histograms
///@{
CounterPtr _n_3S,_n_2S;
Histo1DPtr _h_3S_2S_neutral,_h_3S_1S_neutral;
Histo1DPtr _h_3S_2S_ex,_h_3S_2S_in,_h_3S_1S_ex,_h_3S_1S_in;
Histo1DPtr _h_2S_1S_ex,_h_2S_1S_in;
///@}
};
RIVET_DECLARE_PLUGIN(CLEOII_1994_I356001);
}
|