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## Rivet analyses reference

### DELPHI_1999_S3960137

Measurement of inclusive $\rho^0$, $f_0(980)$, $f_2(1270)$, $K^{*0}_2(1430)$ and $f'_2(1525)$ production in $Z^0$ decays
Experiment: DELPHI (LEP 1)
Inspire ID: 482816
Status: VALIDATED
Authors:
• Peter Richardson
References:
• Phys.Lett.B449:364-382,1999
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)

DELPHI results for the production of $\rho^0$, $f_0(980)$, $f_2(1270)$, $K^{*0}_2(1430)$ and $f'_2(1525)$ in $Z^0$ decays. Only the identified particle spectra for $\rho^0$, $f_0(980)$ and $f_2(1270)$ are implemented.

Source code: DELPHI_1999_S3960137.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 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/Beam.hh" #include "Rivet/Projections/FinalState.hh" #include "Rivet/Projections/ChargedFinalState.hh" #include "Rivet/Projections/UnstableParticles.hh" namespace Rivet { /// @brief DELPHI rho,f_0 and f_2 fragmentation function paper /// @author Peter Richardson class DELPHI_1999_S3960137 : public Analysis { public: /// Constructor DELPHI_1999_S3960137() : Analysis("DELPHI_1999_S3960137") {} /// @name Analysis methods //@{ void init() { declare(Beam(), "Beams"); declare(ChargedFinalState(), "FS"); declare(UnstableParticles(), "UFS"); book(_histXpRho , 1, 1, 1); book(_histXpf0 , 1, 1, 2); book(_histXpf2 , 1, 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 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 UnstableParticles& ufs = apply(e, "UFS"); for (const Particle& p : ufs.particles()) { const int id = p.abspid(); double xp = p.p3().mod()/meanBeamMom; switch (id) { case 9010221: _histXpf0->fill(xp); break; case 225: _histXpf2->fill(xp); break; case 113: _histXpRho->fill(xp); break; } } } /// Finalize void finalize() { scale(_histXpf0 , 1./sumOfWeights()); scale(_histXpf2 , 1./sumOfWeights()); scale(_histXpRho, 1./sumOfWeights()); } //@} private: Histo1DPtr _histXpf0; Histo1DPtr _histXpf2; Histo1DPtr _histXpRho; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(DELPHI_1999_S3960137); }