Rivet analyses

Z/γ* + X cross-section shape, differential in pT(Z)

Experiment: D0 (Tevatron Run 2)

Inspire ID: 769689

Status: VALIDATED

Authors: - Andy Buckley - Frank Siegert

References: - arXiv: 0712.0803

Beams: p- p+

Beam energies: (980.0, 980.0)GeV

Run details: - pp̄ → e+e− + jets at 1960~GeV. * Needs mass cut on lepton pair to avoid photon singularity, looser than 40 < mee < 200 GeV.

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

Source code:D0_2008_I769689.cc

// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/DileptonFinder.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_I769689 : public Analysis {
  public:

    RIVET_DEFAULT_ANALYSIS_CTOR(D0_2008_I769689);


    /// @name Analysis methods
    /// @{

    /// Book histograms
    void init() {
      DileptonFinder zfinder(91.2*GeV, 0.2, Cuts::abspid == PID::ELECTRON, Cuts::massIn(40*GeV, 200*GeV));
      declare(zfinder, "DileptonFinder");

      book(_h_ZpT         ,1, 1, 1);
      book(_h_forward_ZpT ,3, 1, 1);
    }


    /// Do the analysis
    void analyze(const Event& e) {
      const DileptonFinder& zfinder = apply<DileptonFinder>(e, "DileptonFinder");
      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;
    /// @}

  };



  RIVET_DECLARE_ALIASED_PLUGIN(D0_2008_I769689, D0_2008_S7554427);

}

Aliases: - D0_2008_S7554427