Rivet analyses

title: D0_2000_I503361

D0 RunI measurement of the Z pT in the electron channel

Experiment: D0 (Tevatron)

Inspire ID: 503361

Status: VALIDATED

Authors: - Simone Amoroso

References: - Phys.Rev. D61 (2000) 032004 - DOI: 10.1103/PhysRevD.61.032004 - arXiv: hep-ex/9907009

Beams: p- p+

Beam energies: (900.0, 900.0)GeV

Run details: - $Z\to ee$ event

D0 measurement of the Drell-Yan differential cross section as a function of the transverse momentum in the electron channel. The dielectron invariant mass is required to be between 75 and 105 GeV.

Source code:D0_2000_I503361.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/DileptonFinder.hh"

namespace Rivet {

/// @brief D0 Run I Z \f$ p_\perp \f$ in Drell-Yan events /// /// @author Simone Amoroso class D0_2000_I503361 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(D0_2000_I503361);


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

/// Book histograms and initialise projections before the run
void init() {

  ///  Initialise and register projections here
  DileptonFinder zfinder(91.2 * GeV, 0.0, Cuts::abspid == PID::ELECTRON,
                         Cuts::massIn(75 * GeV, 105 * GeV));
  declare(zfinder, "DileptonFinder");

  book(_hist_zpt, 1, 1, 1);
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  /// @todo Do the event by event analysis here
  const DileptonFinder& zfinder = apply<DileptonFinder>(event, "DileptonFinder");
  if (zfinder.bosons().size() != 1) {
    MSG_DEBUG("Num e+ e- pairs found = " << zfinder.bosons().size());
    vetoEvent;
  }
  const FourMomentum& pZ = zfinder.bosons()[0].momentum();
  if (pZ.mass2() < 0) {
    MSG_DEBUG("Negative Z mass**2 = " << pZ.mass2() / GeV2 << "!");
    vetoEvent;
  }

  MSG_DEBUG("Dilepton mass = " << pZ.mass() / GeV << " GeV");
  _hist_zpt->fill(pZ.pT());
}


/// Normalise histograms etc., after the run
void finalize() {
  scale(_hist_zpt, crossSection() / picobarn / sumOfWeights());
}

/// @}

private:

/// @name Histograms
/// @{
Histo1DPtr _hist_zpt;
/// @}

};

RIVET_DECLARE_PLUGIN(D0_2000_I503361);

} ```