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## Rivet analyses reference

### D0_2008_S7554427

$Z/\gamma^* + X$ cross-section shape, differential in $pT(Z)$
Experiment: D0 (Tevatron Run 2)
Inspire ID: 769689
Status: VALIDATED
Authors:
• Andy Buckley
• 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 $40 < m_{ee} < 200$ GeV.

Cross sections as a function of $p_\perp$ of the vector boson inclusive and in forward region ($|y| > 2$, $p_\perp<30$ GeV) in the di-electron channel in $p \bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV, based on an integrated luminosity of 0.98 fb$^{-1}$.

Source code: D0_2008_S7554427.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 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/FinalState.hh" #include "Rivet/Projections/ZFinder.hh" namespace Rivet { /// @brief D0 Run II Z \f$p_\perp \f$ differential cross-section shape /// @author Andy Buckley /// @author Gavin Hesketh /// @author Frank Siegert class D0_2008_S7554427 : public Analysis { public: /// Default constructor. D0_2008_S7554427() : Analysis("D0_2008_S7554427") { } /// @name Analysis methods //@{ /// Book histograms void init() { FinalState fs; ZFinder zfinder(fs, Cuts::open(), PID::ELECTRON, 40*GeV, 200*GeV, 0.2, ZFinder::ClusterPhotons::NODECAY, ZFinder::AddPhotons::YES); declare(zfinder, "ZFinder"); book(_h_ZpT ,1, 1, 1); book(_h_forward_ZpT ,3, 1, 1); } /// Do the analysis void analyze(const Event& e) { const ZFinder& zfinder = apply(e, "ZFinder"); if (zfinder.bosons().size() != 1) { MSG_DEBUG("No unique lepton pair found."); vetoEvent; } const double yZ = fabs(zfinder.bosons()[0].rapidity()); const double pTZ = zfinder.bosons()[0].pT(); _h_ZpT->fill(pTZ); if (yZ > 2) _h_forward_ZpT->fill(pTZ); } // Finalize void finalize() { normalize(_h_ZpT); normalize(_h_forward_ZpT); } //@} private: /// @name Histograms //@{ Histo1DPtr _h_ZpT, _h_forward_ZpT; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(D0_2008_S7554427); }