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Rivet analyses reference
CDF_2009_I856131
Z rapidity measurement
Experiment: CDF (Tevatron Run 2)
Inspire ID: 856131
Status: VALIDATED
Authors:
References:
Beams: p- p+
Beam energies: (980.0, 980.0) GeV
Run details:
- $p \bar{p} \to e^+ e^-$ + jets at 1960 GeV. Needs mass cut on lepton pair to avoid photon singularity, looser than $66 < m_{ee} < 116$ GeV
CDF measurement of the total cross section and rapidity distribution, $\mathrm{d}\sigma/\mathrm{d}y$, for $q\bar{q}\to \gamma^{*}/Z\to e^{+}e^{-}$ events in the $Z$ boson mass region ($66<M_{ee}<116$ GeV/c$^2$) produced in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV with 2.1 fb$^{-1}$ of integrated luminosity.
Source code:
CDF_2009_I856131.cc
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84 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/ZFinder.hh"
namespace Rivet {
/// @brief CDF Z boson rapidity measurement
class CDF_2009_I856131 : public Analysis {
public:
/// @name Constructors etc.
//@{
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(CDF_2009_I856131);
//@}
public:
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
/// Initialise and register projections here
// this seems to have been corrected completely for all selection cuts,
// i.e. eta cuts and pT cuts on leptons.
ZFinder zfinder(FinalState(), Cuts::open(), PID::ELECTRON,
66*GeV, 116*GeV, 0.2, ZFinder::ClusterPhotons::NODECAY, ZFinder::AddPhotons::YES);
declare(zfinder, "ZFinder");
/// Book histograms here
book(_h_xs ,1, 1, 1);
book(_h_yZ ,2, 1, 1);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
const ZFinder& zfinder = apply<ZFinder>(event, "ZFinder");
if (zfinder.bosons().size() == 1) {
_h_yZ->fill(fabs(zfinder.bosons()[0].rapidity()));
_h_xs->fill(1960);
} else {
MSG_DEBUG("no unique lepton pair found.");
}
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_h_xs, crossSection()/sumOfWeights());
// Data seems to have been normalized for the avg of the two sides
// (+ve & -ve rapidity) rather than the sum, hence the 0.5:
scale(_h_yZ, 0.5*crossSection()/sumOfWeights());
}
//@}
private:
/// @name Histograms
//@{
Histo1DPtr _h_yZ;
Histo1DPtr _h_xs;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(CDF_2009_I856131);
}
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