Rivet analyses

title: D0_2007_I744624

$Z/\gamma^* + X$ 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: - Phys.Rev.D76:012003,2007 - arXiv: hep-ex/0702025

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_I744624.cc

```c++ // -- C++ --

include "Rivet/Analysis.hh"

include "Rivet/Projections/DileptonFinder.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_I744624 : public Analysis { public:

RIVET_DEFAULT_ANALYSIS_CTOR(D0_2007_I744624);


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

/// Book histograms
void init() {
  DileptonFinder zfinder(91.2 * GeV, 0.2, Cuts::abspid == PID::ELECTRON,
                         Cuts::massIn(71 * GeV, 111 * GeV));
  declare(zfinder, "DileptonFinder");

  book(_h_yZ, 1, 1, 1);
}


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

};

RIVET_DECLARE_ALIASED_PLUGIN(D0_2007_I744624, D0_2007_S7075677);

} ```

Aliases: - D0_2007_S7075677