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119 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief chi_c1 -> eta pi+pi- and KKpi
class CLEO_2007_I732065 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(CLEO_2007_I732065);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
UnstableParticles ufs = UnstableParticles(Cuts::pid==20443);
declare(ufs, "UFS");
DecayedParticles chi(ufs);
chi.addStable( PID::PI0);
chi.addStable( PID::K0S);
chi.addStable( PID::ETA);
declare(chi, "chi");
for(unsigned int ix=0;ix<3;++ix)
for(unsigned int iy=0;iy<3;++iy)
book(_h[ix][iy],ix+1,1,iy+1);
book(_dalitz[0],"dalitz_1",50,0.,12.,50,0., 9.);
book(_dalitz[1],"dalitz_2",50,0.,10.,50,0.,10.);
book(_dalitz[2],"dalitz_3",50,0.,10.,50,0.,10.);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> & mode1 = { { 221,1}, { 211,1}, {-211,1} };
static const map<PdgId,unsigned int> & mode2 = { { 321,1}, {-321,1}, { 111,1} };
static const map<PdgId,unsigned int> & mode3 = { {-321,1}, { 310,1}, { 211,1} };
static const map<PdgId,unsigned int> & mode4 = { { 321,1}, { 310,1}, {-211,1} };
DecayedParticles chi = apply<DecayedParticles>(event, "chi");
// loop over particles
for(unsigned int ix=0;ix<chi.decaying().size();++ix) {
if(chi.modeMatches(ix,3,mode1)) {
const Particle & eta = chi.decayProducts()[ix].at( 221)[0];
const Particle & pim = chi.decayProducts()[ix].at(-211)[0];
const Particle & pip = chi.decayProducts()[ix].at( 211)[0];
double m1 = (pip.momentum()+pim.momentum()).mass2();
double m2 = (eta.momentum()+pip.momentum()).mass2();
double m3 = (eta.momentum()+pim.momentum()).mass2();
_dalitz[0]->fill(m2,m1);
_h[0][0]->fill(m1);
_h[0][1]->fill(m2);
_h[0][2]->fill(m3);
}
else if(chi.modeMatches(ix,3,mode2)) {
const Particle & pi0 = chi.decayProducts()[ix].at( 111)[0];
const Particle & Km = chi.decayProducts()[ix].at(-321)[0];
const Particle & Kp = chi.decayProducts()[ix].at( 321)[0];
double m1 = (pi0.momentum()+ Km.momentum()).mass2();
double m2 = (pi0.momentum()+ Kp.momentum()).mass2();
double m3 = (Kp .momentum()+ Km.momentum()).mass2();
_dalitz[1]->fill(m2,m1);
_h[1][0]->fill(m1);
_h[1][1]->fill(m2);
_h[1][2]->fill(m3);
}
else {
int sign=1;
if(chi.modeMatches(ix,3,mode3)) {
sign = 1;
}
else if(chi.modeMatches(ix,3,mode4)) {
sign = -1;
}
else continue;
const Particle & KS0 = chi.decayProducts()[ix].at( 310)[0];
const Particle & Km = chi.decayProducts()[ix].at(-sign*321)[0];
const Particle & pip = chi.decayProducts()[ix].at( sign*211)[0];
double m1 = (pip.momentum()+ Km.momentum()).mass2();
double m2 = (pip.momentum()+KS0.momentum()).mass2();
double m3 = (Km .momentum()+KS0.momentum()).mass2();
_dalitz[2]->fill(m2,m1);
_h[2][0]->fill(m1);
_h[2][1]->fill(m2);
_h[2][2]->fill(m3);
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
for(unsigned int ix=0;ix<3;++ix) {
normalize(_dalitz[ix]);
for(unsigned int iy=0;iy<3;++iy)
normalize(_h[ix][iy]);
}
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h[3][3];
Histo2DPtr _dalitz[3];
/// @}
};
RIVET_DECLARE_PLUGIN(CLEO_2007_I732065);
}
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