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Rivet analyses reference
ARGUS_1994_I354224
$K^0_s$ production in B decays
Experiment: ARGUS (DORIS)
Inspire ID: 354224
Status: VALIDATED
Authors:
References:
- Z.Phys. C62 (1994) 371-382, 1994
Beams: * *
Beam energies: ANY
Run details:
- In principle any process producing $B^\pm$ and $B^0,\bar{B}^0$, bot original at Upsilon 4S
Measurement of the spectrum for $K^0_S$ production in $B$ decays. The original measurement was done by ARGUS at the $\Upsilon(4S)$ resonance and therefore represents that admixture of $B^\pm$ and $B^0,\bar{B}^0$.
Source code:
ARGUS_1994_I354224.cc
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85 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief k0s in b decays
class ARGUS_1994_I354224 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ARGUS_1994_I354224);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(UnstableParticles(), "UFS");
// Book histograms
book(_h_K, 1, 1, 1);
book(_nB,"TMP/nB");
}
void analyzeDecay(Particle mother, Particles & kaons) {
for(const Particle & p : mother.children()) {
if(p.pid()==310) {
kaons.push_back(p);
}
else if(!p.children().empty()) {
analyzeDecay(p,kaons);
}
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
for(const Particle& p : apply<UnstableParticles>(event, "UFS").particles(Cuts::abspid==511 or Cuts::abspid==521)) {
if(!p.children().empty()) {
if(p.children()[0].pid()==p.pid()) continue;
}
FourMomentum pB = p.momentum();
const LorentzTransform B_boost = LorentzTransform::mkFrameTransformFromBeta(pB.betaVec());
_nB->fill();
Particles kaons;
analyzeDecay(p,kaons);
for(const Particle & kaon : kaons) {
FourMomentum pKaon = B_boost.transform(kaon.momentum());
_h_K->fill(pKaon.p3().mod());
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_h_K, 1./ *_nB);
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_K;
CounterPtr _nB;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(ARGUS_1994_I354224);
}
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