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## Rivet analyses reference

### L3_1995_I381046

Production of $B^*$ mesons at LEP1
Experiment: L3 (LEP)
Inspire ID: 381046
Status: VALIDATED
Authors:
• Peter Richardson
References:
• Phys.Lett. B345 (1995) 589-597, 1995
Beams: e- e+
Beam energies: ANY
Run details:
The ratio of vector to pseudoscalar for $B$ meson production at LEP1.
  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 // -*- 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(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(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); }