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Rivet analyses reference
BESIII_2020_I1763897
$\chi_{c(0,1,2)}\to \phi\phi\eta$
Experiment: BESIII (BEPC)
Inspire ID: 1763897
Status: VALIDATED NOHEPDATA
Authors:
References:
- Phys.Rev.D 101 (2020) 1, 012012
Beams: * *
Beam energies: ANY
Run details:
- Any process producing chi_c originally e+e-
Measurement of the mass distributions in the decays $\chi_{c(0,1,2)}\to \phi\phi\eta$. The data were read from the plots in the paper and may not be corrected for efficiency or background.
Source code:
BESIII_2020_I1763897.cc
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88 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief chi_c -> phi phi eta
class BESIII_2020_I1763897 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BESIII_2020_I1763897);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
UnstableParticles ufs = UnstableParticles(Cuts::pid==20443 or
Cuts::pid==445 or
Cuts::pid==10441);
declare(ufs, "UFS");
DecayedParticles chi(ufs);
chi.addStable( PID::PI0);
chi.addStable( PID::K0S);
chi.addStable( PID::ETA);
chi.addStable( PID::ETAPRIME);
chi.addStable( PID::PHI);
declare(chi, "chi");
for(unsigned int ix=0;ix<3;++ix) {
book(_dalitz[ix], "dalitz_"+toString(ix+1),50,2.,7.,50,2.,7.);
for(unsigned int iy=0;iy<2;++iy) {
book(_h[ix][iy],1+ix,1,1+iy);
}
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> & mode = { {333,2}, {221,1}};
DecayedParticles chi = apply<DecayedParticles>(event, "chi");
// loop over particles
for(unsigned int ix=0;ix<chi.decaying().size();++ix) {
if(!chi.modeMatches(ix,3,mode)) continue;
unsigned int iloc = chi.decaying()[ix].pid()==10441 ? 0 : chi.decaying()[ix].pid()==445 ? 2 : 1;
const Particle & eta = chi.decayProducts()[ix].at(221)[0];
const Particles & phi = chi.decayProducts()[ix].at(333);
_h[iloc][0]->fill((phi[0].momentum()+phi[1].momentum()).mass());
double mPhiEta[2]={(phi[0].momentum()+eta.momentum()).mass2(),
(phi[1].momentum()+eta.momentum()).mass2()};
_h[iloc][1]->fill(sqrt(mPhiEta[0]));
_h[iloc][1]->fill(sqrt(mPhiEta[1]));
_dalitz[iloc]->fill(mPhiEta[0],mPhiEta[1]);
_dalitz[iloc]->fill(mPhiEta[1],mPhiEta[0]);
}
}
/// 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<2;++iy) {
normalize(_h[ix][iy]);
}
}
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h[3][2];
Histo2DPtr _dalitz[3];
/// @}
};
RIVET_DECLARE_PLUGIN(BESIII_2020_I1763897);
}
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