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## Rivet analyses reference

### CDF_2009_I856131

Z rapidity measurement
Experiment: CDF (Tevatron Run 2)
Inspire ID: 856131
Status: VALIDATED
Authors:
• Frank Siegert
References:
Beams: p- p+
Beam energies: (980.0, 980.0) GeV
Run details:
• $p \bar{p} \to e^+ e^-$ + jets at 1960 GeV. Needs mass cut on lepton pair to avoid photon singularity, looser than $66 < m_{ee} < 116$ GeV

CDF measurement of the total cross section and rapidity distribution, $\mathrm{d}\sigma/\mathrm{d}y$, for $q\bar{q}\to \gamma^{*}/Z\to e^{+}e^{-}$ events in the $Z$ boson mass region ($66<M_{ee}<116$ GeV/c$^2$) produced in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV with 2.1 fb$^{-1}$ of integrated luminosity.

Source code: CDF_2009_I856131.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 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/FinalState.hh" #include "Rivet/Projections/ZFinder.hh" namespace Rivet { /// @brief CDF Z boson rapidity measurement class CDF_2009_I856131 : public Analysis { public: /// @name Constructors etc. //@{ /// Constructor CDF_2009_I856131() : Analysis("CDF_2009_I856131") { } //@} public: /// @name Analysis methods //@{ /// Book histograms and initialise projections before the run void init() { /// Initialise and register projections here // this seems to have been corrected completely for all selection cuts, // i.e. eta cuts and pT cuts on leptons. ZFinder zfinder(FinalState(), Cuts::open(), PID::ELECTRON, 66*GeV, 116*GeV, 0.2, ZFinder::CLUSTERNODECAY, ZFinder::TRACK); declare(zfinder, "ZFinder"); /// Book histograms here _h_xs = bookHisto1D(1, 1, 1); _h_yZ = bookHisto1D(2, 1, 1); } /// Perform the per-event analysis void analyze(const Event& event) { const ZFinder& zfinder = apply(event, "ZFinder"); if (zfinder.bosons().size() == 1) { const double weight = event.weight(); _h_yZ->fill(fabs(zfinder.bosons()[0].rapidity()), weight); _h_xs->fill(1960, weight); } else { MSG_DEBUG("no unique lepton pair found."); } } /// Normalise histograms etc., after the run void finalize() { scale(_h_xs, crossSection()/sumOfWeights()); // Data seems to have been normalized for the avg of the two sides // (+ve & -ve rapidity) rather than the sum, hence the 0.5: scale(_h_yZ, 0.5*crossSection()/sumOfWeights()); } //@} private: /// @name Histograms //@{ Histo1DPtr _h_yZ; Histo1DPtr _h_xs; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(CDF_2009_I856131); }