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Rivet analyses reference
BELLE_2010_I871475
Mass distributions in $B^+\to J/\psi, \psi(2S) +K^+\pi^+\pi^-$
Experiment: BELLE (KEKB)
Inspire ID: 871475
Status: VALIDATED NOHEPDATA
Authors:
References:
- Phys.Rev.D 83 (2011) 032005
Beams: * *
Beam energies: ANY
Run details:
- Any process producing B+ mesons, originally Upsilon(4S) decays
Measurement of mass distributions in the decays $B^+\to J/\psi, \psi(2S) +K^+\pi^+\pi^-$. The data were read from the plots in the paper and may not have been corrected for efficiency and resolution, although ther backgrounds given in the paper have been subtracted.
Source code:
BELLE_2010_I871475.cc
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120 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
#include "Rivet/Tools/BinnedHistogram.hh"
namespace Rivet {
/// @brief B+ -> J/psi/psi(2S) K+ pi+ pi-
class BELLE_2010_I871475 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2010_I871475);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
UnstableParticles ufs = UnstableParticles(Cuts::abspid==521);
declare(ufs, "UFS");
DecayedParticles BP(ufs);
BP.addStable(100443);
BP.addStable(443);
declare(BP, "BP");
// histograms
vector<double> bins[2] = {{0.60,1.46,2.32,3.18,4.04,4.90},
{0.60,1.00,1.40,1.80,2.20,2.60}};
for(unsigned int ix=0;ix<2;++ix) {
book(_c[ix],"TMP/c_"+toString(ix+1));
for(unsigned int iy=0;iy<3;++iy) {
book(_h_all[ix][iy],1+ix,1,1+iy);
if(iy>1) continue;
for(unsigned int iz=0;iz<5;++iz) {
Histo1DPtr tmp;
book(tmp,3+ix,1+iy,1+iz);
_h_slice[ix][iy].add(bins[ix][iz],bins[ix][iz+1],tmp);
}
}
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> & mode1 = { { 321,1}, { 211,1}, {-211,1}, { 443,1}};
static const map<PdgId,unsigned int> & mode1CC = { {-321,1}, { 211,1}, {-211,1}, { 443,1}};
static const map<PdgId,unsigned int> & mode2 = { { 321,1}, { 211,1}, {-211,1}, { 100443,1}};
static const map<PdgId,unsigned int> & mode2CC = { {-321,1}, { 211,1}, {-211,1}, { 100443,1}};
DecayedParticles BP = apply<DecayedParticles>(event, "BP");
// loop over particles
for(unsigned int ix=0;ix<BP.decaying().size();++ix) {
int imode=-1, sign = 1;
if (BP.decaying()[ix].pid()>0 && BP.modeMatches(ix,4,mode1)) {
sign=1;
imode=0;
}
else if (BP.decaying()[ix].pid()<0 && BP.modeMatches(ix,4,mode1CC)) {
sign=-1;
imode=0;
}
else if (BP.decaying()[ix].pid()>0 && BP.modeMatches(ix,4,mode2)) {
sign=1;
imode=1;
}
else if (BP.decaying()[ix].pid()<0 && BP.modeMatches(ix,4,mode2CC)) {
sign=-1;
imode=1;
}
else
continue;
const Particle & Kp = BP.decayProducts()[ix].at( 321*sign)[0];
const Particle & pip = BP.decayProducts()[ix].at( 211*sign)[0];
const Particle & pim = BP.decayProducts()[ix].at(-211*sign)[0];
double m2Kpipi = (Kp .momentum()+pip.momentum()+pim.momentum()).mass2();
double m2Kpi = (Kp .momentum()+pim.momentum()).mass2();
double m2pipi = (pip.momentum()+pim.momentum()).mass2();
_h_all[imode][0]->fill(m2Kpipi);
_h_all[imode][1]->fill(m2Kpi );
_h_all[imode][2]->fill(m2pipi );
_h_slice[imode][0].fill(m2Kpipi,m2Kpi );
_h_slice[imode][1].fill(m2Kpipi,m2pipi);
_c[imode]->fill();
}
}
/// Normalise histograms etc., after the run
void finalize() {
for(unsigned int ix=0;ix<2;++ix) {
for(unsigned int iy=0;iy<3;++iy) {
scale(_h_all[ix][iy],1./ *_c[ix]);
if(iy>1) continue;
for (Histo1DPtr histo : _h_slice[ix][iy].histos())
scale(histo, 1./ *_c[ix]);
}
}
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h_all[2][3];
BinnedHistogram _h_slice[2][2];
CounterPtr _c[2];
/// @}
};
RIVET_DECLARE_PLUGIN(BELLE_2010_I871475);
}
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