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Rivet analyses reference
BESIII_2018_I1693610
Mass distributions in the decays $D^0\to K^-\pi^+\eta^\prime$, $D^0\to K^0_S\pi^0\eta^\prime$, $D^+\to K^0_S\pi^+\eta^\prime$
Experiment: BESIII (BEPC)
Inspire ID: 1693610
Status: VALIDATED NOHEPDATA
Authors:
References:
- Phys.Rev.D 98 (2018) 9, 092009
Beams: * *
Beam energies: ANY
Run details:
- Any process producing D0 or D+ mesons
Measurement of the mass distributions in the decays $D^0\to K^-\pi^+\eta^\prime$, $D^0\to K^0_S\pi^0\eta^\prime$, $D^+\to K^0_S\pi^+\eta^\prime$ by BES. The data were read from the plots in the paper and therefore for some points the error bars are the size of the point. It is also not clear that any resolution effects have been unfolded.
Source code:
BESIII_2018_I1693610.cc
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118 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief D -> eta' decays
class BESIII_2018_I1693610 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BESIII_2018_I1693610);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
UnstableParticles ufs = UnstableParticles(Cuts::abspid==411||
Cuts::abspid==421);
declare(ufs, "UFS");
DecayedParticles DD(ufs);
DD.addStable(PID::PI0);
DD.addStable(PID::K0S);
DD.addStable(PID::ETA);
DD.addStable(PID::ETAPRIME);
declare(DD, "DD");
// histograms
for(unsigned int ix=0;ix<9;++ix)
book(_h[ix],1,1,1+ix);
for(unsigned int ix=0;ix<3;++ix)
book(_dalitz[ix],"dalitz_"+toString(ix+1),50,0.4,0.9,50,1.1,1.9);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// define the decay modes
static const map<PdgId,unsigned int> & mode1 = { {-321,1},{ 211,1}, { 331,1}};
static const map<PdgId,unsigned int> & mode1CC = { { 321,1},{-211,1}, { 331,1}};
static const map<PdgId,unsigned int> & mode2 = { { 310,1},{ 111,1}, { 331,1}};
static const map<PdgId,unsigned int> & mode3 = { { 310,1},{ 211,1}, { 331,1}};
static const map<PdgId,unsigned int> & mode3CC = { { 310,1},{-211,1}, { 331,1}};
DecayedParticles DD = apply<DecayedParticles>(event, "DD");
// loop over particles
for(unsigned int ix=0;ix<DD.decaying().size();++ix) {
// D0 -> K- pi+ omega
if( (DD.decaying()[ix].pid()== 421 && DD.modeMatches(ix,3,mode1)) ||
(DD.decaying()[ix].pid()==-421 && DD.modeMatches(ix,3,mode1CC))) {
int sign = DD.decaying()[ix].pid()/421;
const Particles & pip = DD.decayProducts()[ix].at( sign*211);
const Particles & Km = DD.decayProducts()[ix].at(-sign*321);
const Particles & etaP = DD.decayProducts()[ix].at(331);
double mKpi = (pip[0].momentum()+Km[0].momentum()).mass2();
double mpietaP = (pip[0].momentum()+etaP[0].momentum()).mass2();
_dalitz[0]->fill(mKpi,mpietaP);
_h[0]->fill(sqrt(mKpi));
_h[1]->fill((Km[0].momentum()+etaP[0].momentum()).mass());
_h[2]->fill(sqrt(mpietaP));
}
// D0 -> KS0 pi0 etaP
else if (DD.decaying()[ix].abspid()==421 && DD.modeMatches(ix,3,mode2)) {
const Particles & pi0 = DD.decayProducts()[ix].at(111);
const Particles & KS0 = DD.decayProducts()[ix].at(310);
const Particles & etaP = DD.decayProducts()[ix].at(331);
double mKpi = (pi0[0].momentum()+KS0[0].momentum()).mass2();
double mpietaP = (pi0[0].momentum()+etaP[0].momentum()).mass2();
_dalitz[1]->fill(mKpi,mpietaP);
_h[3]->fill(sqrt(mKpi));
_h[4]->fill((KS0[0].momentum()+etaP[0].momentum()).mass());
_h[5]->fill(sqrt(mpietaP));
}
// D0 -> K- pi+ etaP
else if( (DD.decaying()[ix].pid()== 411 && DD.modeMatches(ix,3,mode3)) ||
(DD.decaying()[ix].pid()==-411 && DD.modeMatches(ix,3,mode3CC))) {
int sign = DD.decaying()[ix].pid()/411;
const Particles & pip = DD.decayProducts()[ix].at( sign*211);
const Particles & KS0 = DD.decayProducts()[ix].at(310);
const Particles & etaP = DD.decayProducts()[ix].at(331);
double mKpi = (pip[0].momentum()+KS0[0].momentum()).mass2();
double mpietaP = (pip[0].momentum()+etaP[0].momentum()).mass2();
_dalitz[2]->fill(mKpi,mpietaP);
_h[6]->fill(sqrt(mKpi));
_h[7]->fill((KS0[0].momentum()+etaP[0].momentum()).mass());
_h[8]->fill(sqrt(mpietaP));
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
for(unsigned int ix=0;ix<9;++ix)
normalize(_h[ix],1.,false);
for(unsigned int ix=0;ix<3;++ix)
normalize(_dalitz[ix]);
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h[9];
Histo2DPtr _dalitz[3];
/// @}
};
RIVET_DECLARE_PLUGIN(BESIII_2018_I1693610);
}
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