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## Rivet analyses reference

### OPAL_1998_S3702294

Production of $f_0(980)$, $f_2(1270)$ and $\phi(1020)$ in hadronic $Z^0$ decay
Experiment: OPAL (LEP 1)
Inspire ID: 467092
Status: VALIDATED
Authors:
• Peter Richardson
References:
• Eur.Phys.J.C4:19-28,1998
• hep-ex/9802013
Beams: e+ e-
Beam energies: (45.6, 45.6) GeV
Run details:
• Hadronic Z decay events generated on the Z pole ($\sqrt{s} = 91.2$ GeV)

Inclusive production of the $f_0(980)$, $f_2(1270)$ and $\phi(1020)$ resonances studied in a sample of 4.3 million hadronic $Z^0$ decays from the OPAL experiment at LEP. Fragmentation functions are reported for the three states.

Source code: OPAL_1998_S3702294.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 96 97 98 99 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/Beam.hh" #include "Rivet/Projections/FinalState.hh" #include "Rivet/Projections/ChargedFinalState.hh" #include "Rivet/Projections/UnstableFinalState.hh" namespace Rivet { /// @brief OPAL f0,f2 and phi fragmentation function paper /// @author Peter Richardson class OPAL_1998_S3702294 : public Analysis { public: /// Constructor OPAL_1998_S3702294() : Analysis("OPAL_1998_S3702294") {} /// @name Analysis methods //@{ void init() { declare(Beam(), "Beams"); declare(ChargedFinalState(), "FS"); declare(UnstableFinalState(), "UFS"); _histXpf0 = bookHisto1D( 2, 1, 1); _histXpf2 = bookHisto1D( 2, 1, 2); _histXpPhi = bookHisto1D( 2, 1, 3); } void analyze(const Event& e) { // First, veto on leptonic events by requiring at least 4 charged FS particles const FinalState& fs = apply(e, "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"); // Get event weight for histo filling const double weight = e.weight(); // Get beams and average beam momentum const ParticlePair& beams = apply(e, "Beams").beams(); const double meanBeamMom = ( beams.first.p3().mod() + beams.second.p3().mod() ) / 2.0; MSG_DEBUG("Avg beam momentum = " << meanBeamMom); // Final state of unstable particles to get particle spectra const UnstableFinalState& ufs = apply(e, "UFS"); foreach (const Particle& p, ufs.particles()) { const int id = p.abspid(); double xp = p.p3().mod()/meanBeamMom; switch (id) { case 9010221: _histXpf0->fill(xp, weight); break; case 225: _histXpf2->fill(xp, weight); break; case 333: _histXpPhi->fill(xp, weight); break; } } } /// Finalize void finalize() { scale(_histXpf0 , 1./sumOfWeights()); scale(_histXpf2 , 1./sumOfWeights()); scale(_histXpPhi, 1./sumOfWeights()); } //@} private: Histo1DPtr _histXpf0; Histo1DPtr _histXpf2; Histo1DPtr _histXpPhi; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(OPAL_1998_S3702294); }