// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief B0 -> K+ pi- pi0
class BABAR_2011_I897848 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2011_I897848);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
UnstableParticles ufs = UnstableParticles(Cuts::abspid==511);
declare(ufs, "UFS");
DecayedParticles B0(ufs);
B0.addStable(PID::PI0);
declare(B0, "B0");
// histograms
for(unsigned int ix=0;ix<3;++ix) {
for(unsigned int iy=0;iy<2;++iy) {
book(_h[ix][iy],1+ix,1,1+iy);
}
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> & mode = { { 321,1},{-211,1}, { 111,1}};
static const map<PdgId,unsigned int> & modeCC = { {-321,1},{ 211,1}, { 111,1}};
DecayedParticles B0 = apply<DecayedParticles>(event, "B0");
// loop over particles
for(unsigned int ix=0;ix<B0.decaying().size();++ix) {
int sign = 1;
if (B0.decaying()[ix].pid()>0 && B0.modeMatches(ix,3,mode)) {
sign=1;
}
else if (B0.decaying()[ix].pid()<0 && B0.modeMatches(ix,3,modeCC)) {
sign=-1;
}
else
continue;
const Particle & Kp = B0.decayProducts()[ix].at( sign*321)[0];
const Particle & pim = B0.decayProducts()[ix].at(-sign*211)[0];
const Particle & pi0 = B0.decayProducts()[ix].at( 111)[0];
double mpipi = (pim.momentum()+pi0.momentum()).mass();
_h[0][0]->fill(mpipi);
if(mpipi<1.8) _h[0][1]->fill(mpipi);
double mKpi = (Kp.momentum()+pi0.momentum()).mass();
_h[1][0]->fill(mKpi);
if(mKpi<1.8) _h[1][1]->fill(mKpi);
mKpi = (Kp.momentum()+pim.momentum()).mass();
_h[2][0]->fill(mKpi);
if(mKpi<1.8) _h[2][1]->fill(mKpi);
}
}
/// Normalise histograms etc., after the run
void finalize() {
for(unsigned int ix=0;ix<3;++ix) {
for(unsigned int iy=0;iy<2;++iy) {
normalize(_h[ix][iy],1.,false);
}
}
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h[3][2];
/// @}
};
RIVET_DECLARE_PLUGIN(BABAR_2011_I897848);
}