rivet is hosted by Hepforge, IPPP Durham

## Rivet analyses reference

### ARGUS_1994_I354224

$K^0_s$ production in B decays
Experiment: ARGUS (DORIS)
Inspire ID: 354224
Status: VALIDATED
Authors:
• Peter Richardson
References:
• Z.Phys. C62 (1994) 371-382, 1994
Beams: * *
Beam energies: ANY
Run details:
• In principle any process producting $B^\pm$ 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
  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 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 DEFAULT_RIVET_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(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 DECLARE_RIVET_PLUGIN(ARGUS_1994_I354224); }