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## Rivet analyses reference

### CDF_1990_S2089246

CDF pseudorapidity distributions at 630 and 1800 GeV
Experiment: CDF (Tevatron Run 0)
Inspire ID: 283352
Status: VALIDATED
Authors:
• Andy Buckley
References:
Beams: p- p+
Beam energies: (315.0, 315.0); (900.0, 900.0) GeV
Run details:
• QCD min bias events at $\sqrt{s} = 630$ and 1800 GeV. Particles with $c \tau > 10$\;mm should be set stable.

Pseudorapidity distributions based on the CDF 630 and 1800 GeV runs from 1987. All data is detector corrected. The data confirms the UA5 measurement of a $\mathrm{d}{N}/\mathrm{d}{\eta}$ rise with energy faster than $\ln{\sqrt{s}}$, and as such this analysis is important for constraining the energy evolution of minimum bias and underlying event characteristics in MC simulations.

Source code: CDF_1990_S2089246.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 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/ChargedFinalState.hh" #include "Rivet/Projections/TriggerCDFRun0Run1.hh" namespace Rivet { /// @brief CDF pseudorapidity analysis at 630 and 1800 GeV /// @author Andy Buckley class CDF_1990_S2089246 : public Analysis { public: /// Constructor CDF_1990_S2089246() : Analysis("CDF_1990_S2089246") { } /// @name Analysis methods //@{ void init() { // Setup projections declare(TriggerCDFRun0Run1(), "Trigger"); declare(ChargedFinalState((Cuts::etaIn(-3.5, 3.5))), "CFS"); // Book histo if (fuzzyEquals(sqrtS()/GeV, 1800, 1E-3)) { book(_hist_eta ,3, 1, 1); } else if (fuzzyEquals(sqrtS()/GeV, 630, 1E-3)) { book(_hist_eta ,4, 1, 1); } book(_sumWTrig, "sumWTrig"); } /// Do the analysis void analyze(const Event& event) { // Trigger const bool trigger = apply(event, "Trigger").minBiasDecision(); if (!trigger) vetoEvent; _sumWTrig->fill(); // Loop over final state charged particles to fill eta histos const FinalState& fs = apply(event, "CFS"); for (const Particle& p : fs.particles()) { const double eta = p.eta(); _hist_eta->fill(fabs(eta)); } } /// Finalize void finalize() { // Divide through by num events to get d/d(eta) in bins // Factor of 1/2 for |eta| -> eta scale(_hist_eta, 0.5/ *_sumWTrig); } //@} private: /// @name Weight counter //@{ CounterPtr _sumWTrig; //@} /// @name Histogram collections //@{ Histo1DPtr _hist_eta; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(CDF_1990_S2089246); }