// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief B- -> Sigma_c++ pbar pi- pi-
class BABAR_2012_I1127599 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2012_I1127599);
/// @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( 4222);
BP.addStable(-4222);
declare(BP, "BP");
// histos
for(unsigned int ix=0;ix<3;++ix)
book(_h[ix],1+ix,1,1);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> & mode = { { 4222,1},{-2212,1}, {-211,2}};
static const map<PdgId,unsigned int> & modeCC = { {-4222,1},{ 2212,1}, { 211,2}};
DecayedParticles BP = apply<DecayedParticles>(event, "BP");
// loop over particles
for(unsigned int ix=0;ix<BP.decaying().size();++ix) {
int sign = 1;
if (BP.decaying()[ix].pid()<0 && BP.modeMatches(ix,4,mode)) {
sign=1;
}
else if (BP.decaying()[ix].pid()>0 && BP.modeMatches(ix,4,modeCC)) {
sign=-1;
}
else
continue;
const Particle & SigC = BP.decayProducts()[ix].at( sign*4222)[0];
const Particle & pbar = BP.decayProducts()[ix].at(-sign*2212)[0];
const Particles & pim = BP.decayProducts()[ix].at(-sign*211 );
for(unsigned int ix=0;ix<2;++ix) {
_h[0]->fill((pbar.momentum()+pim[ix].momentum()).mass());
_h[1]->fill((SigC.momentum()+pim[ix].momentum()).mass());
}
_h[2]->fill((SigC.momentum()+pim[0].momentum()+pim[1].momentum()).mass());
}
}
/// Normalise histograms etc., after the run
void finalize() {
for(unsigned int ix=0;ix<3;++ix)
normalize(_h[ix],1.,false);
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h[3];
/// @}
};
RIVET_DECLARE_PLUGIN(BABAR_2012_I1127599);
}