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$Z$ forward-backward asymmetry
Experiment: ATLAS (LHC)
Inspire ID: 1351916
  • Christian Gutschow
References: Beams: p+ p+
Beam energies: (3500.0, 3500.0) GeV
Run details:
  • Inclusive $Z$ in the muon channel

Measurements from the ATLAS experiment of the forward-backward asymmetry in the reaction $pp \rightarrow Z / \gamma^\ast \rightarrow \ell^+\ell^-$, with $\ell$ being electrons or muons. The results are based on the full set of data collected in 2011 in $pp$ collisions at the LHC at $\sqrt{s} = 7$ TeV, corresponding to an integrated luminosity of 4.8 $\text{fb}^{-1}$. The measured asymmetry values are found to be in agreement with the corresponding Standard Model predictions. The default routine will pick up the electron decay channel of the $Z$ boson. Individual channels can be specified directly with the plugins ATLAS_2014_I1312627_EL and ATLAS_2014_I1312627_MU, respectively. N.B. When running on multiple files, the asymmetry might have to be reconstructed in a post-processing step. To that end, the necessary Histo1D objects are written out as well. The asymmetry is a Scatter2D objects ending in y01 and is constructed from the Histo1D objects (ending in y02 and y03) in the following way: y01 = (y02 - y03) / (y02 + y03)