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Observation of top-quark pair production in association with a photon and measurement of the $t\bar{t}\gamma$ production cross section in pp collisions at $\sqrt{s}=7$ TeV using the ATLAS detector

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Academic year: 2021

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Figure 2: Distributions for the t tγ ¯ selection (see text). The photon candidate transverse energy (E T ) distribution in data (points) is compared to the expectation (stacked histograms) for the electron (left) and muon (right) channels.
Figure 3: Comparison of the nominal prompt-photon track-isolation (p iso T ) template with the template obtained from data using a Z(→ e + e − )+ ≥ 4-jets selection, and with the template obtained from t ¯ tγ simulation
Figure 5: Track-isolation background template distribution after maximization of the likelihood L f
Table I: Estimates of the number of selected events with prompt photons, or electrons misidentified as photons, from various backgrounds to t ¯ tγ production, including
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