// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief B* production
class L3_1995_I381046 : public Analysis {
public:
/// Constructor
DEFAULT_RIVET_ANALYSIS_CTOR(L3_1995_I381046);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
// // Initialise and register projections
declare(ChargedFinalState(), "FS");
declare(UnstableParticles(), "UFS");
// Book histograms
book(_c_bStar, "/TMP/cbStar ");
book(_c_B , "/TMP/cB ");
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// First, veto on leptonic events by requiring at least 4 charged FS particles
const FinalState& fs = apply<FinalState>(event, "FS");
const size_t numParticles = fs.particles().size();
// Even if we only generate hadronic events, we still need a cut on numCharged >= 2.
if (numParticles < 2) {
MSG_DEBUG("Failed leptonic event cut");
vetoEvent;
}
MSG_DEBUG("Passed leptonic event cut");
for(const Particle& p : apply<UnstableParticles>(event, "UFS").particles(Cuts::abspid==513 or Cuts::abspid==523 or
Cuts::abspid==511 or Cuts::abspid==521)) {
// count number of Bs not from mixing or B*
if(p.abspid()==511 || p.abspid()==521) {
if(p.parents()[0].abspid()==p.abspid()) continue;
if(p.parents()[0].abspid()==513 || p.parents()[0].abspid()==523) continue;
_c_B->fill();
}
// B*
else {
_c_bStar->fill();
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
// no of B*/B+B*
Scatter2DPtr h1;
book(h1,1,1,1);
Counter ctemp = *_c_bStar+*_c_B;
double val = _c_bStar->val()/ctemp.val();
double err = val*sqrt(sqr(_c_bStar->err()/_c_bStar->val())+sqr(ctemp.err()/ctemp.val()));
h1->addPoint(91.2,val,make_pair(0.5,0.5),make_pair(err,err) );
}
//@}
/// @name Histograms
//@{
CounterPtr _c_bStar,_c_B;
//@}
};
// The hook for the plugin system
DECLARE_RIVET_PLUGIN(L3_1995_I381046);
}