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## Rivet analyses reference

### TASSO_1989_I278856

Spectrum for $D^{*+}$ production in $e^+e^-$ collisions at $E_{\text{CMS}}=36.2$
Experiment: TASSO (Petra)
Inspire ID: 278856
Status: VALIDATED
Authors:
• Peter Richardson
References:
• Z.Phys. C44 (1989) 365, 1989
Beams: e+ e-
Beam energies: (17.2, 17.2) GeV
Run details:
Measurement of the $D^{*+}$ momentum spectrum in $e^+e^-$ collisions for a mean centre-of-mass energy of 36.2 GeV by the TASSO experiment at Petra. Only the spectra are implemented.
  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 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/UnstableParticles.hh" #include "Rivet/Projections/Beam.hh" namespace Rivet { /// @brief D* production at 36.2 GeV class TASSO_1989_I278856 : public Analysis { public: /// Constructor DEFAULT_RIVET_ANALYSIS_CTOR(TASSO_1989_I278856); /// @name Analysis methods //@{ /// Book histograms and initialise projections before the run void init() { declare(Beam(), "Beams"); declare(UnstableParticles(), "UFS"); // Book histograms book(_h_x_A1, 1, 1, 1); book(_h_x_A2, 1, 1, 2); book(_h_x_B1, 2, 1, 1); book(_h_x_B2, 2, 1, 2); } /// Perform the per-event analysis void analyze(const Event& event) { // 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); const UnstableParticles& ufs = apply(event, "UFS"); for (const Particle& p : ufs.particles(Cuts::abspid==413)) { double modp = p.p3().mod(); double xE = p.E()/meanBeamMom; double beta = modp/p.E(); _h_x_A1->fill(xE); _h_x_A2->fill(xE,1./beta); _h_x_B1->fill(xE); _h_x_B2->fill(xE,1./beta); } } /// Normalise histograms etc., after the run void finalize() { scale(_h_x_A1, crossSection()/picobarn/sumOfWeights()); scale(_h_x_A2, sqr(sqrtS())*crossSection()/nanobarn/sumOfWeights()); scale(_h_x_B1, crossSection()/picobarn/sumOfWeights()); scale(_h_x_B2, sqr(sqrtS())*crossSection()/nanobarn/sumOfWeights()); } //@} /// @name Histograms //@{ Histo1DPtr _h_x_A1, _h_x_A2, _h_x_B1, _h_x_B2; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(TASSO_1989_I278856); }