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Rivet analyses reference
BELLE_2013_I1247463
Dalitz plot analysis of $\Upsilon(5S)\to\Upsilon(1,2,3S)\pi^0\pi^0$
Experiment: BELLE (KEKB)
Inspire ID: 1247463
Status: VALIDATED NOHEPDATA
Authors:
References:
- Phys.Rev.D 88 (2013) 5, 052016
Beams: * *
Beam energies: ANY
Run details:
- Any process producing Upsilon(5S), originally e+e-
Measurement of the mass distributions in the decays $\Upsilon(5S)\to\Upsilon(1,2,3S)\pi^0\pi^0$ by BELLE.
Source code:
BELLE_2013_I1247463.cc
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85 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief Upsilon(5S) -> Upsilon(nS) pi0 pi0
class BELLE_2013_I1247463 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2013_I1247463);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
UnstableParticles ufs = UnstableParticles(Cuts::abspid==9000553);
declare(ufs, "UFS");
DecayedParticles UPS(ufs);
UPS.addStable(PID::PI0);
UPS.addStable( 553);
UPS.addStable(100553);
UPS.addStable(200553);
declare(UPS, "UPS");
// histograms
for(unsigned int ix=0;ix<3;++ix)
for(unsigned int iy=0;iy<3;++iy)
book(_h[ix][iy],1+ix,1,1+iy);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// find the Upsilon(5S) decays
static const map<PdgId,unsigned int> mode[3] = {{ { 553,1}, { 111,2}},
{ { 100553,1}, { 111,2}},
{ { 200553,1}, { 111,2}}};
DecayedParticles UPS = apply<DecayedParticles>(event, "UPS");
for(unsigned int ix=0;ix<UPS.decaying().size();++ix) {
unsigned int imode;
for(imode=0;imode<3;++imode) {
if(UPS.modeMatches(ix,3,mode[imode])) break;
}
if(imode>2) continue;
const Particles & pi0 = UPS.decayProducts()[ix].at( 111);
const Particle & ups = UPS.decayProducts()[ix].at(553+imode*100000)[0];
double mUpsPi[2];
for(unsigned int iy=0;iy<2;++iy)
mUpsPi[iy] = (ups.momentum()+pi0[iy].momentum()).mass();
if(mUpsPi[0]<mUpsPi[1]) swap(mUpsPi[0],mUpsPi[1]);
_h[imode][0]->fill(mUpsPi[0]);
_h[imode][1]->fill((pi0[0].momentum()+pi0[1].momentum()).mass());
_h[imode][2]->fill(mUpsPi[1]);
}
}
/// Normalise histograms etc., after the run
void finalize() {
for(unsigned int ix=0;ix<3;++ix)
for(unsigned int iy=0;iy<3;++iy)
normalize(_h[ix][iy]);
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h[3][3];
/// @}
};
RIVET_DECLARE_PLUGIN(BELLE_2013_I1247463);
}
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