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## Rivet analyses reference

### DASP_1979_I132410

Inclusive $\eta$ production rate for energies between 3.99 and 5.01 GeV
Experiment: DASP (DORIS)
Inspire ID: 132410
Status: VALIDATED
Authors:
• Peter Richardson
References:
• Phys.Lett. B80 (1979) 412-418, 1979
Beams: e- e+
Beam energies: ANY
Run details:
• e+e- to hadrons between 3.99 and 5.01 GeV

Measurement of the rate for inclusive $\eta$ production rate for energies between 3.99 and 5.01 GeV by the DASP experiment.

Source code: DASP_1979_I132410.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 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/UnstableParticles.hh" namespace Rivet { /// @brief inclusive eta production class DASP_1979_I132410 : public Analysis { public: /// Constructor DEFAULT_RIVET_ANALYSIS_CTOR(DASP_1979_I132410); /// @name Analysis methods //@{ /// Book histograms and initialise projections before the run void init() { // Initialise and register projections declare(UnstableParticles(), "UFS"); // Book histograms book(_c_eta, "/TMP/neta"); } /// Perform the per-event analysis void analyze(const Event& event) { const UnstableParticles& ufs = apply(event, "UFS"); _c_eta->fill(ufs.particles(Cuts::pid==221).size()); } /// Normalise histograms etc., after the run void finalize() { scale(_c_eta,1./sumOfWeights()*crossSection()/nanobarn); Scatter2D temphisto(refData(1, 1, 1)); Scatter2DPtr mult; book(mult, 1, 1, 1); for (size_t b = 0; b < temphisto.numPoints(); b++) { const double x = temphisto.point(b).x(); pair ex = temphisto.point(b).xErrs(); pair ex2 = ex; if(ex2.first ==0.) ex2. first=0.0001; if(ex2.second==0.) ex2.second=0.0001; if (inRange(sqrtS()/GeV, x-ex2.first, x+ex2.second)) { mult->addPoint(x, _c_eta->val(), ex, make_pair(_c_eta->err(),_c_eta->err())); } else { mult->addPoint(x, 0., ex, make_pair(0.,.0)); } } } //@} /// @name Histograms //@{ CounterPtr _c_eta; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(DASP_1979_I132410); }