Rivet analyses

title: D0_2010_I856972

Measurement of differential $Z/\gamma^*$ pT

Experiment: D0 (Tevatron Run 2)

Inspire ID: 856972

Status: VALIDATED

Authors: - Flavia Dias - Gavin Hesketh - Frank Siegert

References: - arXiv: 1006.0618

Beams: p- p+

Beam energies: (980.0, 980.0)GeV

Run details: - $p \bar{p} \to \mu^+ \mu^-$ + jets at 1960~GeV. Needs mass cut on lepton pair to avoid photon singularity, looser than $65 < m_{\mu\mu} < 115$ GeV. Restrict $Z/\gamma^*$ mass range to roughly $50~\text{GeV}/c^2 < m_{\mu\mu} < 120~\text{GeV}/c^2$ for efficiency. Weighted events and kinematic sampling enhancement can help to fill the pT tail.

Cross section as a function of pT of the Z boson decaying into muons in $p \bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV, based on an integrated luminosity of 0.97 fb$^{-1}$.

Source code:D0_2010_I856972.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/DileptonFinder.hh"

include "Rivet/Projections/FinalState.hh"

namespace Rivet {

/// @brief Measurement of Z(->muon muon) pT differential cross-section /// /// @author Flavia Dias class D0_2010_I856972 : public Analysis { public:

RIVET_DEFAULT_ANALYSIS_CTOR(D0_2010_I856972);


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

/// Add projections and book histograms
void init() {
  Cut cut = Cuts::abseta < 1.7 && Cuts::pT > 15 * GeV;
  DileptonFinder zfinder(91.2 * GeV, 0.2, cut && Cuts::abspid == PID::MUON,
                         Cuts::massIn(65 * GeV, 115 * GeV));
  declare(zfinder, "DileptonFinder");

  book(_h_Z_pT_normalised, 1, 1, 1);
  book(_h_Z_pT_xs, 2, 1, 1);
}


// Do the analysis
void analyze(const Event& e) {
  const DileptonFinder& zfinder = apply<DileptonFinder>(e, "DileptonFinder");
  if (zfinder.bosons().size() == 1) {
    double ZpT = zfinder.bosons()[0].pT() / GeV;
    _h_Z_pT_normalised->fill(ZpT);
    _h_Z_pT_xs->fill(ZpT);
  }
}


/// Finalize
void finalize() {
  normalize(_h_Z_pT_normalised);
  scale(_h_Z_pT_xs, crossSection() / picobarn / sumOfWeights());
}

/// @}

private:

/// @name Histogram
Histo1DPtr _h_Z_pT_normalised;
Histo1DPtr _h_Z_pT_xs;

};

RIVET_DECLARE_ALIASED_PLUGIN(D0_2010_I856972, D0_2010_S8671338);

} ```

Aliases: - D0_2010_S8671338