// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief B+ -> K+ K- pi+
class BELLE_2017_I1598461 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2017_I1598461);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
UnstableParticles ufs = UnstableParticles(Cuts::abspid==521);
declare(ufs, "UFS");
DecayedParticles BP(ufs);
declare(BP, "BP");
// book histograms
for(unsigned int ix=0;ix<3;++ix) {
if(ix==0) book(_h[ix],1,1,1);
else book(_h[ix],"TMP/h_"+toString(ix+1),refData(1,1,1));
book(_c[ix],"TMP/c_"+toString(ix+1));
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> & mode = { { 321,1},{-321,1}, { 211,1}};
static const map<PdgId,unsigned int> & modeCC = { { 321,1},{ 321,1}, {-211,1}};
DecayedParticles BP = apply<DecayedParticles>(event, "BP");
// loop over particles
for(unsigned int ix=0;ix<BP.decaying().size();++ix) {
_c[0]->fill();
if(BP.decaying()[ix].pid()>0) _c[1]->fill();
else _c[2]->fill();
int sign = 1;
if (BP.decaying()[ix].pid()>0 && BP.modeMatches(ix,3,mode)) {
sign=1;
}
else if (BP.decaying()[ix].pid()<0 && BP.modeMatches(ix,3,modeCC)) {
sign=-1;
}
else
continue;
const Particle & Kp = BP.decayProducts()[ix].at( 321)[0];
const Particle & Km = BP.decayProducts()[ix].at(-321)[0];
double mKK = (Kp.momentum()+Km.momentum()).mass();
_h[0]->fill(mKK);
if(sign==1) _h[1]->fill(mKK);
else _h[2]->fill(mKK);
}
}
/// Normalise histograms etc., after the run
void finalize() {
for(unsigned int ix=0;ix<3;++ix)
scale(_h[ix],1e7/ *_c[ix]);
Scatter2DPtr as;
book(as,1,1,2);
asymm(_h[2],_h[1],as);
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h[3];
CounterPtr _c[3];
/// @}
};
RIVET_DECLARE_PLUGIN(BELLE_2017_I1598461);
}