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Rivet analyses reference
D0_2010_S8671338
Measurement of differential $Z/\gamma^*$ pT
Experiment: D0 (Tevatron Run 2)
Inspire ID: 856972
Status: VALIDATED
Authors:
- Flavia Dias
- Gavin Hesketh
- Frank Siegert
References:
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_S8671338.cc
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69 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/ZFinder.hh"
namespace Rivet {
/// @brief Measurement of Z(->muon muon) pT differential cross-section
/// @author Flavia Dias
class D0_2010_S8671338 : public Analysis {
public:
/// Constructor
D0_2010_S8671338()
: Analysis("D0_2010_S8671338")
{ }
///@name Analysis methods
//@{
/// Add projections and book histograms
void init() {
Cut cut = Cuts::abseta < 1.7 && Cuts::pT > 15*GeV;
ZFinder zfinder(FinalState(), cut, PID::MUON, 65*GeV, 115*GeV, 0.2, ZFinder::ClusterPhotons::NONE, ZFinder::AddPhotons::YES);
declare(zfinder, "ZFinder");
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 ZFinder& zfinder = apply<ZFinder>(e, "ZFinder");
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()/sumOfWeights());
}
//@}
private:
/// @name Histogram
Histo1DPtr _h_Z_pT_normalised;
Histo1DPtr _h_Z_pT_xs;
};
// The hook for the plugin system
DECLARE_RIVET_PLUGIN(D0_2010_S8671338);
}
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