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Rivet analyses reference
BABAR_2012_I1086537
Mass distributions in $B^0\to K^+K^-K^0_S$, $B^+\to K^+K^-K^+$ and $B^+\to K^0_SK^0_SK^+$
Experiment: BABAR (PEP-II)
Inspire ID: 1086537
Status: VALIDATED NOHEPDATA
Authors:
References:
- Phys.Rev.D 85 (2012) 112010
Beams: * *
Beam energies: ANY
Run details:
- Any process producing B0 and B+, originally Upsilon(4S) decays
Mass distributions in $B^0\to K^+K^-K^0_S$, $B^+\to K^+K^-K^+$ and $B^+\to K^0_SK^0_SK^+$. The data were read from the plots in the paper.
Source code:
BABAR_2012_I1086537.cc
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150 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief B -> K K K decays
class BABAR_2012_I1086537 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2012_I1086537);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// projections
UnstableParticles ufs = UnstableParticles(Cuts::abspid==511 or Cuts::abspid==521);
declare(ufs, "UFS");
DecayedParticles BB(ufs);
BB.addStable(310);
declare(BB, "BB");
// histograms
for(unsigned int ix=0;ix<3;++ix)
for(unsigned int iy=0;iy<3;++iy)
book(_h_aver[ix][iy],1+2*ix,1,1+iy);
for(unsigned int ix=0;ix<2;++ix) {
book(_h_charge2[ix],4,1,1+ix);
for(unsigned int iy=0;iy<2;++iy)
book(_h_charge1[ix][iy],2,1+iy,1+ix);
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> & mode1 = { { 321,2},{-321,1}};
static const map<PdgId,unsigned int> & mode1CC = { { 321,1},{-321,2}};
static const map<PdgId,unsigned int> & mode2 = { { 310,2},{ 321,1}};
static const map<PdgId,unsigned int> & mode2CC = { { 310,2},{-321,1}};
static const map<PdgId,unsigned int> & mode3 = { { 310,1},{ 321,1} ,{-321,1}};
DecayedParticles BB = apply<DecayedParticles>(event, "BB");
for(unsigned int ix=0;ix<BB.decaying().size();++ix) {
int sign = 1, imode = 0;
if (BB.decaying()[ix].pid()>0 && BB.modeMatches(ix,3,mode1)) {
imode=0;
sign=1;
}
else if (BB.decaying()[ix].pid()<0 && BB.modeMatches(ix,3,mode1CC)) {
imode=0;
sign=-1;
}
else if (BB.decaying()[ix].pid()>0 && BB.modeMatches(ix,3,mode2)) {
imode=1;
sign=1;
}
else if (BB.decaying()[ix].pid()<0 && BB.modeMatches(ix,3,mode2CC)) {
imode=1;
sign=-1;
}
else if (BB.modeMatches(ix,3,mode3)) {
imode=2;
if(BB.decaying()[ix].pid()<0) sign=-1;
}
else
continue;
// B+ -> K+ K+ K-
if(imode==0) {
const Particles & Kp = BB.decayProducts()[ix].at( sign*321);
const Particle & Km = BB.decayProducts()[ix].at(-sign*321)[0];
double mKpKm[2];
for(unsigned int ix=0;ix<2;++ix)
mKpKm[ix] = (Kp[ix].momentum()+Km.momentum()).mass();
if(mKpKm[0]>mKpKm[1]) swap(mKpKm[0],mKpKm[1]);
_h_aver[0][0]->fill(mKpKm[0]);
_h_aver[0][1]->fill(mKpKm[1]);
_h_aver[0][2]->fill((Kp[0].momentum()+Kp[1].momentum()).mass());
if(BB.decaying()[ix].pid()>0) {
for(unsigned int ix=0;ix<2;++ix) _h_charge1[0][ix]->fill(mKpKm[0]);
}
else {
for(unsigned int ix=0;ix<2;++ix) _h_charge1[1][ix]->fill(mKpKm[0]);
}
}
// B+ -> KS0 KS0 K+
else if(imode==1) {
const Particles & K0 = BB.decayProducts()[ix].at( 310);
const Particle & Kp = BB.decayProducts()[ix].at( sign*321)[0];
double mK0K0 = (K0[0].momentum()+K0[1].momentum()).mass();
_h_aver[1][0]->fill(mK0K0);
double mKpK0[2];
for(unsigned int ix=0;ix<2;++ix)
mKpK0[ix] = (K0[ix].momentum()+Kp.momentum()).mass();
if(mKpK0[0]>mKpK0[1]) swap(mKpK0[0],mKpK0[1]);
_h_aver[1][1]->fill(mKpK0[1]);
_h_aver[1][2]->fill(mKpK0[0]);
if(BB.decaying()[ix].pid()>0) {
_h_charge2[0]->fill(mK0K0);
}
else {
_h_charge2[1]->fill(mK0K0);
}
}
// B0 -> KS0 K+ K-
else if(imode==2) {
const Particle & K0 = BB.decayProducts()[ix].at( 310)[0];
const Particle & Kp = BB.decayProducts()[ix].at( sign*321)[0];
const Particle & Km = BB.decayProducts()[ix].at(-sign*321)[0];
_h_aver[2][0]->fill((Kp.momentum()+Km.momentum()).mass());
_h_aver[2][1]->fill((K0.momentum()+Km.momentum()).mass());
_h_aver[2][2]->fill((K0.momentum()+Kp.momentum()).mass());
}
}
}
/// 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_aver[ix][iy],1.,false);
for(unsigned int ix=0;ix<2;++ix) {
normalize(_h_charge2[ix],1.,false);
for(unsigned int iy=0;iy<2;++iy)
normalize(_h_charge1[ix][iy],1.,false);
}
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h_aver[3][3];
Histo1DPtr _h_charge1[2][2];
Histo1DPtr _h_charge2[2];
/// @}
};
RIVET_DECLARE_PLUGIN(BABAR_2012_I1086537);
}
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