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## Rivet analyses reference

### D0_2007_S7075677

$Z/\gamma^* + X$ cross-section shape, differential in $y(Z)$
Experiment: D0 (Tevatron Run 2)
Inspire ID: 744624
Status: VALIDATED
Authors:
• Andy Buckley
• Gavin Hesketh
• Frank Siegert
References:
Beams: p- p+
Beam energies: (980.0, 980.0) GeV
Run details:
• Drell-Yan $p \bar{p} \to Z/\gamma^*$ + jets events at $\sqrt{s}$ = 1960 GeV. Needs mass cut on lepton pair to avoid photon singularity, looser than $71 < m_{ee} < 111$ GeV

Cross sections as a function of di-electron rapidity $p \bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV, based on an integrated luminosity of $0.4 \text{fb}^{-1}$.

Source code: D0_2007_S7075677.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 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/ZFinder.hh" namespace Rivet { /// @brief Measurement of D0 Run II Z \f$p_\perp \f$ diff cross-section shape /// @author Andy Buckley /// @author Gavin Hesketh /// @author Frank Siegert class D0_2007_S7075677 : public Analysis { public: /// Default constructor. D0_2007_S7075677() : Analysis("D0_2007_S7075677") { } /// @name Analysis methods //@{ /// Book histograms void init() { ZFinder zfinder(FinalState(), Cuts::open(), PID::ELECTRON, 71*GeV, 111*GeV, 0.2, ZFinder::ClusterPhotons::NODECAY, ZFinder::AddPhotons::YES); declare(zfinder, "ZFinder"); book(_h_yZ ,1, 1, 1); } /// Do the analysis void analyze(const Event & e) { const ZFinder& zfinder = apply(e, "ZFinder"); if (zfinder.bosons().size() == 1) { const Particles& el(zfinder.constituents()); if (el[0].pT() > 25*GeV || el[1].pT() > 25*GeV) { _h_yZ->fill(fabs(zfinder.bosons()[0].rapidity())); } } else { MSG_DEBUG("No unique lepton pair found."); } } // Finalize void finalize() { // Data seems to have been normalized for the avg of the two sides // (+ve & -ve rapidity) rather than the sum, hence the 0.5: normalize(_h_yZ, 0.5); } //@} private: /// @name Histograms //@{ Histo1DPtr _h_yZ; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(D0_2007_S7075677); }