// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief B- -> pbar Lambda D0
class BELLE_2011_I924618 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2011_I924618);
/// @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( 3122);
BP.addStable(-3122);
BP.addStable( 421);
BP.addStable(-421);
declare(BP, "BP");
// histos
book(_h,1,1,1);
book(_c,"TMP/nB");
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> & mode = { {-2212,1},{ 3122,1}, { 421,1}};
static const map<PdgId,unsigned int> & modeCC = { { 2212,1},{-3122,1}, {-421,1}};
DecayedParticles BP = apply<DecayedParticles>(event, "BP");
// loop over particles
for(unsigned int ix=0;ix<BP.decaying().size();++ix) {
_c->fill();
int sign = 1;
if (BP.decaying()[ix].pid()<0 && BP.modeMatches(ix,3,mode)) {
sign=1;
}
else if (BP.decaying()[ix].pid()>0 && BP.modeMatches(ix,3,modeCC)) {
sign=-1;
}
else
continue;
const Particle & pbar = BP.decayProducts()[ix].at(-sign*2212)[0];
const Particle & Lam = BP.decayProducts()[ix].at( sign*3122)[0];
_h->fill((pbar.momentum()+Lam.momentum()).mass());
}
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_h, 1e6/ *_c);
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h;
CounterPtr _c;
/// @}
};
RIVET_DECLARE_PLUGIN(BELLE_2011_I924618);
}