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## Rivet analyses reference

### TPC_1984_I200105

$\phi$ spectrum at 29 GeV
Experiment: TPC (PEP)
Inspire ID: 200105
Status: VALIDATED
Authors:
• Peter Richardson
References:
• Phys.Rev.Lett. 52 (1984) 2201, 1984
Beams: e+ e-
Beam energies: (14.5, 14.5) GeV
Run details:
• e+e- to hadrons at 29 GeV

Measurement of the $\phi$ spectra at 29 GeV by the TPC experiment.

Source code: TPC_1984_I200105.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 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/FinalState.hh" #include "Rivet/Projections/UnstableParticles.hh" #include "Rivet/Projections/FastJets.hh" #include "Rivet/Projections/Thrust.hh" #include "Rivet/Projections/Beam.hh" namespace Rivet { /// @brief Add a short analysis description here class TPC_1984_I200105 : public Analysis { public: /// Constructor DEFAULT_RIVET_ANALYSIS_CTOR(TPC_1984_I200105); /// @name Analysis methods //@{ /// Book histograms and initialise projections before the run void init() { declare(Beam(), "Beams"); const FinalState cfs(Cuts::charge != 0); declare(cfs, "FS"); const Thrust thrust(cfs); declare(thrust, "Thrust"); declare(UnstableParticles(), "UFS"); // Book histograms book(_h_x , 1, 1, 1); book(_h_pt, 3, 1, 1); } /// Perform the per-event analysis void analyze(const Event& event) { // require 5 charged particles const FinalState& fs = apply(event, "FS"); if(fs.size()<3) vetoEvent; // Get beams and average beam momentum const ParticlePair& beams = apply(event, "Beams").beams(); const double meanBeamMom = ( beams.first.p3().mod() + beams.second.p3().mod() ) / 2.0; MSG_DEBUG("Avg beam momentum = " << meanBeamMom); // calc thrust const Thrust& thrust = apply(event, "Thrust"); Vector3 axis = thrust.thrustAxis(); // Final state of unstable particles to get particle spectra const UnstableParticles& ufs = apply(event, "UFS"); for (const Particle& p : ufs.particles(Cuts::pid==333)) { double xE = p.E()/meanBeamMom; double pT2 = p.p3().mod2()-sqr(axis.dot(p.p3())); _h_x ->fill(xE ); _h_pt->fill(pT2); } } /// Normalise histograms etc., after the run void finalize() { scale(_h_x, 1./sumOfWeights()); scale(_h_pt, 1./sumOfWeights()); } //@} /// @name Histograms //@{ Histo1DPtr _h_x,_h_pt; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(TPC_1984_I200105); }