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Rivet analyses reference
BELLE_2009_I820737
Mass distributions in $\bar{B}^0\to K^-\pi^+\psi(2S)$ and $B^+\to K^0_S\pi^+\psi(2S)$
Experiment: BELLE (KEKB)
Inspire ID: 820737
Status: VALIDATED NOHEPDATA
Authors:
References:
- Phys.Rev.D 80 (2009) 031104
Beams: * *
Beam energies: ANY
Run details:
- Any process producing B+ and B0 mesons, originally Upsilon(4S) decays
Measurement of mass distributions in $\bar{B}^0\to K^-\pi^+\psi(2S)$ and $B^+\to K^0_S\pi^+\psi(2S)$ decays, only the average of the two modes is measured. The data were read from the plots in the paper and may not be corrected for efficiency/acceptance, however the backgrounds given in the paper have been subtracted.
Source code:
BELLE_2009_I820737.cc
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112 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
#include "Rivet/Tools/BinnedHistogram.hh"
namespace Rivet {
/// @brief B-> K pi psi(2S)
class BELLE_2009_I820737 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2009_I820737);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
UnstableParticles ufs = UnstableParticles(Cuts::abspid==511 ||
Cuts::abspid==521);
declare(ufs, "UFS");
DecayedParticles BB(ufs);
BB.addStable(310);
BB.addStable(100443);
declare(BB, "BB");
// histograms
vector<double> bins1 = {0,sqr(0.796),sqr(0.996),sqr(1.332),sqr(1.532),3};
vector<double> bins2 = {0,19.0,20.5,23};
for(unsigned int ix=0;ix<5;++ix) {
Histo1DPtr tmp;
book(tmp,1,1,1+ix);
_h_piPsi.add(bins1[ix],bins1[ix+1],tmp);
if(ix>2) continue;
book(tmp,2,1,1+ix);
_h_Kpi.add(bins2[ix],bins2[ix+1],tmp);
}
book(_h_veto,3,1,1);
book(_c,"TMP/nB");
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> & mode1 = { { 321,1},{-211,1}, { 100443,1}};
static const map<PdgId,unsigned int> & mode1CC = { {-321,1},{ 211,1}, { 100443,1}};
static const map<PdgId,unsigned int> & mode2 = { { 310,1},{-211,1}, { 100443,1}};
static const map<PdgId,unsigned int> & mode2CC = { { 310,1},{ 211,1}, { 100443,1}};
DecayedParticles BB = apply<DecayedParticles>(event, "BB");
// loop over particles
for(unsigned int ix=0;ix<BB.decaying().size();++ix) {
int sign = 1,iK(0);
if (BB.decaying()[ix].pid()>0 && BB.modeMatches(ix,3,mode1)) {
sign=1; iK = 321;
}
else if (BB.decaying()[ix].pid()<0 && BB.modeMatches(ix,3,mode1CC)) {
sign=-1; iK=-321;
}
else if (BB.decaying()[ix].pid()>0 && BB.modeMatches(ix,3,mode2)) {
sign=1; iK = 310;
}
else if (BB.decaying()[ix].pid()<0 && BB.modeMatches(ix,3,mode2CC)) {
sign=-1; iK= 310;
}
else
continue;
_c->fill();
const Particle & Kp = BB.decayProducts()[ix].at( iK)[0];
const Particle & pim = BB.decayProducts()[ix].at(-211*sign)[0];
const Particle & psi = BB.decayProducts()[ix].at( 100443 )[0];
double m2Kpi = (Kp .momentum()+pim.momentum()).mass2();
double m2Psipi= (psi.momentum()+pim.momentum()).mass2();
_h_piPsi.fill(m2Kpi ,m2Psipi);
_h_Kpi .fill(m2Psipi,m2Kpi );
if(m2Kpi<sqr(0.796) || (m2Kpi>sqr(0.996)&&m2Kpi<sqr(1.332)) ||
m2Kpi>sqr(1.532)) _h_veto->fill(m2Psipi);
}
}
/// Normalise histograms etc., after the run
void finalize() {
for(Histo1DPtr h : _h_piPsi.histos()) {
scale(h, 1./ *_c);
}
for(Histo1DPtr h : _h_Kpi.histos()) {
scale(h, 1./ *_c);
}
normalize(_h_veto,1.,false);
}
/// @}
/// @name Histograms
/// @{
BinnedHistogram _h_piPsi,_h_Kpi;
CounterPtr _c;
Histo1DPtr _h_veto;
/// @}
};
RIVET_DECLARE_PLUGIN(BELLE_2009_I820737);
}
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