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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief Add a short analysis description here
class BELLE_2015_I1397632 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2015_I1397632);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(UnstableParticles(), "UFS");
// Book histograms
book(_h_B_Denu, 1, 1, 1);
book(_h_B_Dmunu, 1, 1, 2);
book(_h_B_Deplusnu, 2, 1, 1);
book(_h_B_Dmuplusnu, 2, 1, 2);
}
// Check for explicit decay into pdgids
bool isSemileptonicDecay(const Particle& mother, vector<int> ids) {
// Trivial check to ignore any other decays but the one in question modulo photons
const Particles children = mother.children(Cuts::pid!=PID::PHOTON);
if (children.size()!=ids.size()) return false;
// Check for the explicit decay
return all(ids, [&](int i){return count(children, hasPID(i))==1;});
}
// Calculate the recoil w using mother and daugher meson
double recoilW(const Particle& B, int mesonID) {
// TODO why does that not work with const?
Particle D = filter_select(B.children(), Cuts::pid==mesonID)[0];
FourMomentum q = B.mom() - D.mom();
return (B.mom()*B.mom() + D.mom()*D.mom() - q*q )/ (2. * sqrt(B.mom()*B.mom()) * sqrt(D.mom()*D.mom()) );
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// Get B0 Mesons
for(const Particle& p : apply<UnstableParticles>(event, "UFS").particles(Cuts::pid==PID::B0)) {
if (isSemileptonicDecay(p, {PID::DMINUS,PID::POSITRON,PID::NU_E})) _h_B_Denu->fill( recoilW(p, PID::DMINUS));
if (isSemileptonicDecay(p, {PID::DMINUS,PID::ANTIMUON,PID::NU_MU})) _h_B_Dmunu->fill(recoilW(p, PID::DMINUS));
}
// Get B+ Mesons
for(const Particle& p : apply<UnstableParticles>(event, "UFS").particles(Cuts::pid==PID::BPLUS)) {
if (isSemileptonicDecay(p, {PID::D0BAR,PID::POSITRON,PID::NU_E})) _h_B_Deplusnu->fill( recoilW(p, PID::D0BAR));
if (isSemileptonicDecay(p, {PID::D0BAR,PID::ANTIMUON,PID::NU_MU})) _h_B_Dmuplusnu->fill(recoilW(p, PID::D0BAR));
}
}
/// Normalise histograms etc., after the run
void finalize() {
normalize(_h_B_Denu);
normalize(_h_B_Dmunu);
normalize(_h_B_Deplusnu);
normalize(_h_B_Dmuplusnu);
}
//@}
private:
/// @name Histograms
//@{
Histo1DPtr _h_B_Denu;
Histo1DPtr _h_B_Dmunu;
Histo1DPtr _h_B_Deplusnu;
Histo1DPtr _h_B_Dmuplusnu;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(BELLE_2015_I1397632);
}
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