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## Rivet analyses reference

### CLEO_2007_I728872

Spectrum of $\phi$ mesons in $\Upsilon(4S)$ and $\Upsilon(5S)$ decays
Experiment: CLEO (CESR)
Inspire ID: 728872
Status: VALIDATED
Authors:
• Peter Richardson
References:
• Phys.Rev. D75 (2007) 012002
Beams: * *
Beam energies: ANY
Run details:
• Any process producing $\Upsilon(4S)$ or $\Upsilon(5S)$, original $e^+e^-$

Measurement of the $\phi$ meson spectrum in $\Upsilon(4S)$ and $\Upsilon(5S)$ decays by CLEO, only the spectra are included not the conclusions on $B_s$ production drawn from them.

Source code: CLEO_2007_I728872.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 86 87 88 89 90 91 92 93 94 95 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/UnstableParticles.hh" namespace Rivet { /// @brief Add a short analysis description here class CLEO_2007_I728872 : public Analysis { public: /// Constructor DEFAULT_RIVET_ANALYSIS_CTOR(CLEO_2007_I728872); /// @name Analysis methods //@{ /// Book histograms and initialise projections before the run void init() { // Initialise and register projections declare(UnstableParticles(), "UFS"); // Book histograms book(_h_4S, 1, 1, 5); book(_h_5S, 2, 1, 5); book(_c_4S, "/TMP/N4S"); book(_c_5S, "/TMP/N5S"); } void findDecayProducts(const Particle & p, Particles & phi) { for(const Particle & child : p.children()) { if(child.pid()==333) phi.push_back(child); else if(!child.children().empty()) findDecayProducts(child,phi); } } /// Perform the per-event analysis void analyze(const Event& event) { // Find the Upsilons among the unstables const UnstableParticles& ufs = apply(event, "UFS"); Particles upsilons = ufs.particles(Cuts::pid==300553 || Cuts::pid==400553); for (const Particle& ups : upsilons) { LorentzTransform cms_boost; if (ups.p3().mod() > 1*MeV) cms_boost = LorentzTransform::mkFrameTransformFromBeta(ups.momentum().betaVec()); Particles phis; findDecayProducts(ups, phis); if(ups.pid()==300553) _c_4S->fill(); else _c_5S->fill(); for(const Particle & phi : phis) { FourMomentum p2 = cms_boost.transform(phi.momentum()); double x = 2.*p2.p3().mod()/ups.mass(); if(ups.pid()==300553) _h_4S->fill(x); else _h_5S->fill(x); } } } /// Normalise histograms etc., after the run void finalize() { if(_h_4S->effNumEntries()!=0) scale(_h_4S ,100./ *_c_4S); if(_h_5S->effNumEntries()!=0) scale(_h_5S ,100./ *_c_5S); } //@} /// @name Histograms //@{ Histo1DPtr _h_4S,_h_5S; CounterPtr _c_4S,_c_5S; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(CLEO_2007_I728872); }