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Rivet analyses reference
BESIII_2014_I1280710
$\chi_{c(1,2)}\to \eta^\prime K^+K^-$
Experiment: BESIII ()
Inspire ID: 1280710
Status: VALIDATED NOHEPDATA
Authors:
References:
- Phys.Rev.D 89 (2014) 7, 074030
Beams: * *
Beam energies: ANY
Run details:
- Any process producing chi_c1 or chi_c2
Measurement of the mass distributions in the decays $\chi_{c(1,2)}\to \eta^\prime K^+K^-$. The data were read from the plots in the paper and may not be corrected for efficiency.
Source code:
BESIII_2014_I1280710.cc
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86 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief chi_c -> eta' K+K-
class BESIII_2014_I1280710 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BESIII_2014_I1280710);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
UnstableParticles ufs = UnstableParticles(Cuts::pid==20443 or Cuts::pid==445);
declare(ufs, "UFS");
DecayedParticles chi(ufs);
chi.addStable( PID::PI0);
chi.addStable( PID::K0S);
chi.addStable( PID::ETA);
chi.addStable( PID::ETAPRIME);
declare(chi, "chi");
for(unsigned int ix=0;ix<4;++ix)
for(unsigned int iy=0;iy<2;++iy)
book(_h[ix][iy],1+ix,1,1+iy);
for(unsigned int ix=0;ix<2;++ix)
book(_dalitz[ix],"dalitz_"+toString(ix+1),50,2.,10.,50,2., 10.);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> & mode1 = { { 331,1}, { 321,1}, {-321,1} };
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)) continue;
unsigned int iloc = chi.decaying()[ix].pid()==445 ? 1 : 0;
const Particle & eta = chi.decayProducts()[ix].at( 331)[0];
const Particle & Km = chi.decayProducts()[ix].at(-321)[0];
const Particle & Kp = chi.decayProducts()[ix].at( 321)[0];
double m1 = (Kp .momentum()+Km.momentum()).mass2();
double m2 = (eta.momentum()+Kp.momentum()).mass2();
double m3 = (eta.momentum()+Km.momentum()).mass2();
_dalitz[iloc]->fill(m2,m3);
for(unsigned int ix=0;ix<2;++ix) {
_h[2*iloc+ix][0]->fill(sqrt(m1));
_h[2*iloc+ix][1]->fill(sqrt(m2));
_h[2*iloc+ix][1]->fill(sqrt(m3));
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
for(unsigned int iy=0;iy<2;++iy) {
normalize(_dalitz[iy]);
for(unsigned int ix=0;ix<4;++ix)
normalize(_h[ix][iy]);
}
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h[4][2];
Histo2DPtr _dalitz[2];
/// @}
};
RIVET_DECLARE_PLUGIN(BESIII_2014_I1280710);
}
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