// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief Bbar0 -> Lambda_c+ Lambdabar K-
class BABAR_2011_I924163 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2011_I924163);
/// @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( 3122);
B0.addStable(-3122);
B0.addStable( 4122);
B0.addStable(-4122);
declare(B0, "B0");
// histos
for(unsigned int ix=0;ix<3;++ix)
book(_h[ix],1,1,1+ix);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> & mode = { { 4122,1},{-3122,1}, {-321,1}};
static const map<PdgId,unsigned int> & modeCC = { {-4122,1},{ 3122,1}, { 321,1}};
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 & LamC = B0.decayProducts()[ix].at( sign*4122)[0];
const Particle & Lam = B0.decayProducts()[ix].at(-sign*3122)[0];
const Particle & Km = B0.decayProducts()[ix].at(-sign*321 )[0];
_h[0]->fill((LamC.momentum()+Lam.momentum()).mass());
_h[1]->fill((Lam .momentum()+Km .momentum()).mass());
_h[2]->fill((LamC.momentum()+Km .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_2011_I924163);
}