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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// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/FinalState.hh"
 4#include "Rivet/Projections/ZFinder.hh"
 5
 6namespace Rivet {
 7
 8
 9  /// @brief D0 Run II Z \f$ p_\perp \f$ differential cross-section shape
10  ///
11  /// @author Andy Buckley
12  /// @author Gavin Hesketh
13  /// @author Frank Siegert
14  class D0_2008_S7554427 : public Analysis {
15  public:
16
17    RIVET_DEFAULT_ANALYSIS_CTOR(D0_2008_S7554427);
18
19
20    /// @name Analysis methods
21    /// @{
22
23    /// Book histograms
24    void init() {
25      FinalState fs;
26      ZFinder zfinder(fs, Cuts::open(), PID::ELECTRON,
27                      40*GeV, 200*GeV, 0.2, ZFinder::ClusterPhotons::NODECAY, ZFinder::AddPhotons::YES);
28      declare(zfinder, "ZFinder");
29
30      book(_h_ZpT         ,1, 1, 1);
31      book(_h_forward_ZpT ,3, 1, 1);
32    }
33
34
35    /// Do the analysis
36    void analyze(const Event& e) {
37      const ZFinder& zfinder = apply<ZFinder>(e, "ZFinder");
38      if (zfinder.bosons().size() != 1) {
39        MSG_DEBUG("No unique lepton pair found.");
40        vetoEvent;
41      }
42      const double yZ = fabs(zfinder.bosons()[0].rapidity());
43      const double pTZ = zfinder.bosons()[0].pT();
44      _h_ZpT->fill(pTZ);
45      if (yZ > 2) _h_forward_ZpT->fill(pTZ);
46    }
47
48
49    // Finalize
50    void finalize() {
51      normalize(_h_ZpT);
52      normalize(_h_forward_ZpT);
53    }
54
55    /// @}
56
57
58  private:
59
60    /// @name Histograms
61    /// @{
62    Histo1DPtr _h_ZpT, _h_forward_ZpT;
63    /// @}
64
65  };
66
67
68
69  RIVET_DECLARE_ALIASED_PLUGIN(D0_2008_S7554427, D0_2008_I769689);
70
71}