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## Rivet analyses reference

Spectrum for $D^{*+}$ production in $e^+e^-$ collisions at $E_{\text{CMS}}=34.4$
Inspire ID: 202785
Status: VALIDATED
Authors:
• Peter Richardson
References:
• Phys.Lett. 104B (1981) 325-329
Beams: e+ e-
Beam energies: (17.2, 17.2) GeV
Run details:
• e+ e- to hadrons

Measurement of the $D^{*+}$ momentum spectrum in $e^+e^-$ collisions for a centre-of-mass energy of 34.4 GeV by the JADE experiment at Petra. The angular distribution is also measured.

  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 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/UnstableParticles.hh" #include "Rivet/Projections/Beam.hh" namespace Rivet { /// @brief D*+ production at 34.4 GeV class JADE_1984_I202785 : public Analysis { public: /// Constructor DEFAULT_RIVET_ANALYSIS_CTOR(JADE_1984_I202785); /// @name Analysis methods //@{ /// Book histograms and initialise projections before the run void init() { declare(Beam(), "Beams"); declare(UnstableParticles(), "UFS"); // Book histograms book(_h_x , 1, 1, 1); book(_h_theta, 3, 1, 1); } /// 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); Vector3 axis = beams.first.pid() == PID::EMINUS ? beams.first.p3().unit() : beams.second.p3().unit(); const UnstableParticles& ufs = apply(event, "UFS"); for (const Particle& p : ufs.particles(Cuts::abspid==413)) { double modp = p.p3().mod(); double xP =modp/meanBeamMom; _h_x->fill(xP); if(xP>0.4&&p.pid()>0) { _h_theta->fill(p.p3().dot(axis)/modp); } } } /// Normalise histograms etc., after the run void finalize() { normalize(_h_theta,33.6,false); // normalize to data scale(_h_x, crossSection()/microbarn/sumOfWeights()*sqr(sqrtS())); } //@} /// @name Histograms //@{ Histo1DPtr _h_x, _h_theta; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(JADE_1984_I202785); }