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113 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief eta_c -> K+K-pi0 KS0 K+-pi-+
class BABAR_2015_I1403544 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2015_I1403544);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
UnstableParticles ufs = UnstableParticles(Cuts::pid== 441);
declare(ufs, "UFS");
DecayedParticles ETAC(ufs);
ETAC.addStable(PID::PI0);
ETAC.addStable(PID::K0S);
ETAC.addStable(PID::ETA);
ETAC.addStable(PID::ETAPRIME);
declare(ETAC,"ETAC");
// histograms
book(_h_Kppip,3,1,1);
book(_h_K0pip,3,1,2);
book(_h_K0Kp ,3,1,3);
book(_dalitz[0], "dalitz_1",50,0.,8.,50,0.,8.);
book(_h_Kppi0,4,1,1);
book(_h_Kmpi0,4,1,2);
book(_h_KpKm ,4,1,3);
book(_dalitz[1], "dalitz_2",50,0.,8.,50,0.,8.);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> & mode1 = { { 321,1}, {-321,1}, { 111,1}};
static const map<PdgId,unsigned int> & mode2 = { { 321,1}, {-211,1}, { 310,1}};
static const map<PdgId,unsigned int> & mode2CC = { {-321,1}, { 211,1}, { 310,1}};
DecayedParticles ETAC = apply<DecayedParticles>(event, "ETAC");
// loop over particles
for(unsigned int ix=0;ix<ETAC.decaying().size();++ix) {
// K+ K- pi0
if (ETAC.modeMatches(ix,3,mode1)&&
ETAC.decaying()[ix].mass()>2.922 && ETAC.decaying()[ix].mass()<3.036) {
const Particle & Kp = ETAC.decayProducts()[ix].at( 321)[0];
const Particle & Km = ETAC.decayProducts()[ix].at(-321)[0];
const Particle & pi0 = ETAC.decayProducts()[ix].at( 111)[0];
double mplus = (Kp.momentum()+pi0.momentum()).mass2();
double mminus = (Km.momentum()+pi0.momentum()).mass2();
double mKK = (Kp.momentum()+Km .momentum()).mass2();
_h_KpKm->fill(mKK);
_h_Kppi0->fill(mplus);
_h_Kmpi0->fill(mminus);
_dalitz[1]->fill(mplus,mminus);
continue;
}
else if(ETAC.decaying()[ix].mass()>2.922 && ETAC.decaying()[ix].mass()<3.039) {
int sign=1;
if (ETAC.modeMatches(ix,3,mode2 )) sign= 1;
else if(ETAC.modeMatches(ix,3,mode2CC)) sign=-1;
else continue;
const Particle & KS0 = ETAC.decayProducts()[ix].at( 310)[0];
const Particle & Kp = ETAC.decayProducts()[ix].at( sign*321)[0];
const Particle & pim = ETAC.decayProducts()[ix].at(-sign*211)[0];
double mplus = (Kp.momentum() + pim.momentum()).mass2();
double mminus = (KS0.momentum() + pim.momentum()).mass2();
double mKK = (Kp.momentum() + KS0.momentum()).mass2();
_h_K0Kp ->fill(mKK);
_h_Kppip->fill(mplus);
_h_K0pip->fill(mminus);
_dalitz[0]->fill(mplus,mminus);
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
normalize(_h_Kppip);
normalize(_h_K0pip);
normalize(_h_K0Kp );
normalize(_dalitz[0]);
normalize(_h_Kppi0);
normalize(_h_Kmpi0);
normalize(_h_KpKm );
normalize(_dalitz[1]);
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h_Kppip,_h_K0pip,_h_K0Kp;
Histo1DPtr _h_Kppi0,_h_Kmpi0,_h_KpKm;
Histo2DPtr _dalitz[2];
/// @}
};
RIVET_DECLARE_PLUGIN(BABAR_2015_I1403544);
}
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