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ATLAS_2013_I1234228

High-mass Drell-Yan at 7 TeV
Experiment: ATLAS (LHC)
Inspire ID: 1234228
Status: VALIDATED
Authors:
  • Christian Gutschow
References: Beams: p+ p+
Beam energies: (3500.0, 3500.0) GeV
Run details:
  • Drell-Yan production in pp collisions at 7 TeV

This Letter reports a measurement of the high-mass Drell-Yan differential cross-section in proton-proton collisions at a centre-of-mass energy of 7 TeV at the LHC. Based on an integrated luminosity of 4.9 fb$^{-1}$, the differential cross-section in the $Z/\gamma^\ast \rightarrow e^+e^-$ channel is measured with the ATLAS detector as a function of the invariant mass, $m_{ee}$, in the range $116< m_{ee} <1500$ GeV, for a fiducial region in which both the electron and the positron have transverse momentum $p_\text{T}>25$ GeV and pseudorapidity $|\eta|<2.5$. A comparison is made to various event generators and to the predictions of perturbative QCD calculations at next-to-next-to-leading order.

Source code: ATLAS_2013_I1234228.cc
 1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/FinalState.hh"
 4#include "Rivet/Projections/DileptonFinder.hh"
 5
 6namespace Rivet {
 7
 8
 9  /// @brief Add a short analysis description here
10  class ATLAS_2013_I1234228 : public Analysis {
11  public:
12
13
14    /// Constructor
15    RIVET_DEFAULT_ANALYSIS_CTOR(ATLAS_2013_I1234228);
16
17    /// @name Analysis methods
18    /// @{
19
20    /// Book histograms and initialise projections before the run
21    void init() {
22
23      const FinalState fs;
24      Cut cuts = Cuts::abseta < 2.5 && Cuts::pT > 25*GeV;
25      DileptonFinder zfinder(91.2*GeV, 0.1, cuts && Cuts::abspid == PID::ELECTRON, Cuts::massIn(116*GeV, 1500*GeV));
26      declare(zfinder, "DileptonFinder");
27
28      book(_hist_mll, 1, 1, 2);
29    }
30
31
32    /// Perform the per-event analysis
33    void analyze(const Event& event) {
34      const DileptonFinder& zfinder = apply<DileptonFinder>(event, "DileptonFinder");
35
36      if (zfinder.bosons().size() != 1)  vetoEvent;
37
38      double mass = zfinder.bosons()[0].mass();
39      _hist_mll->fill(mass);
40    }
41
42
43    /// Normalise histograms etc., after the run
44    void finalize() {
45      const double sf = crossSection()/picobarn/sumOfWeights();
46      scale(_hist_mll, sf);
47    }
48
49    /// @}
50
51  private:
52
53
54    /// @name Histograms
55    /// @{
56    Histo1DPtr _hist_mll;
57    /// @}
58
59  };
60
61  RIVET_DECLARE_PLUGIN(ATLAS_2013_I1234228);
62
63}