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## Rivet analyses reference

### HRS_1988_I23360

Charm meson spectra in $e^+e^-$ collisions at 29 GeV
Experiment: HRS (PEP)
Inspire ID: 23360
Status: VALIDATED
Authors:
• Peter Richardson
References:
• Phys.Lett. B206 (1988) 551-556, 1988
Beams: e+ e-
Beam energies: (14.5, 14.5) GeV
Run details:
• Hadronic e+e- events at $\sqrt{s} = 29.$ GeV

$D^{*\pm}$, $D^0,\bar{D}^0$ and $D^\pm$ meson momentum spectrum measured at $\sqrt{s} = 29.$ GeV using the HRS detector at PEP. Only the spectra are implemented, not the electroweak asymmetries.

Source code: HRS_1988_I23360.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 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/Beam.hh" #include "Rivet/Projections/ChargedFinalState.hh" #include "Rivet/Projections/UnstableParticles.hh" namespace Rivet { /// @brief Charm meson spectra at 29 GeV class HRS_1988_I23360 : public Analysis { public: /// Constructor DEFAULT_RIVET_ANALYSIS_CTOR(HRS_1988_I23360); /// @name Analysis methods //@{ /// Book histograms and initialise projections before the run void init() { // Initialise and register projections declare(Beam(), "Beams"); declare(UnstableParticles(), "UFS"); const ChargedFinalState cfs; declare(cfs, "CFS"); // Book histograms book(_h_Dstar1,1,1,1); book(_h_Dstar2,1,1,2); book(_h_D0 ,2,1,1); book(_h_Dp ,2,1,2); } /// Perform the per-event analysis void analyze(const Event& event) { const ChargedFinalState& cfs = apply(event, "CFS"); int nch = cfs.particles().size(); if(nch<5) 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); const UnstableParticles& ufs = apply(event, "UFS"); for(const Particle & p : ufs.particles(Cuts::abspid==413 || Cuts::abspid==421 || Cuts::abspid==411 )) { double xE = p.E()/meanBeamMom; int id = abs(p.pid()); if(id==413) { _h_Dstar1->fill(xE); _h_Dstar2->fill(xE); } else if(id==421) { _h_D0->fill(xE); } else if(id==411) { _h_Dp->fill(xE); } } } /// Normalise histograms etc., after the run void finalize() { double fact = sqr(sqrtS())*crossSection()/sumOfWeights()/microbarn; scale(_h_Dstar1, fact); normalize(_h_Dstar2); scale(_h_D0,fact); scale(_h_Dp,fact); } //@} /// @name Histograms //@{ Histo1DPtr _h_Dstar1,_h_Dstar2,_h_D0,_h_Dp; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(HRS_1988_I23360); }