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Lower limits on \Lamb as a function of \mestar for (a) the \eejj channel, (b) the \enuJ channel, and (c) combined limits for both channels. The $\pm1(2)\sigma$ uncertainty bands around the expected limit represent all sources of systematic and statistical uncertainties. The limits for $\mestar > 4$~\TeV\ are the result of extrapolation. The individual observed lower limits for the \eejj (same as (a)) and the \enuJ (same as (b)) channels are shown with the blue dot-and-dash lines in (c) for the reference. The exclusion limit set by ATLAS in the $ee\gamma$ search channel~\cite{Aad:2013jja} using 13~\ifb\ of data collected at \rts~=~8~\TeV\ is also shown with the red dotted line in (c).

Lower limits on \Lamb as a function of \mestar for (a) the \eejj channel, (b) the \enuJ channel, and (c) combined limits for both channels. The $\pm1(2)\sigma$ uncertainty bands around the expected limit represent all sources of systematic and statistical uncertainties. The limits for $\mestar > 4$~\TeV\ are the result of extrapolation. The individual observed lower limits for the \eejj (same as (a)) and the \enuJ (same as (b)) channels are shown with the blue dot-and-dash lines in (c) for the reference. The exclusion limit set by ATLAS in the $ee\gamma$ search channel~\cite{Aad:2013jja} using 13~\ifb\ of data collected at \rts~=~8~\TeV\ is also shown with the red dotted line in (c).

Upper limits on $\sigma \times \mathcal{B}$ as a function of \mestar in (a) the \eejj channel and (b) the \enuJ channel. The $\pm1(2)\sigma$ uncertainty bands around the expected limit represent all sources of systematic and statistical uncertainties.

Lower limits on \Lamb as a function of \mestar for (a) the \eejj channel, (b) the \enuJ channel, and (c) combined limits for both channels. The $\pm1(2)\sigma$ uncertainty bands around the expected limit represent all sources of systematic and statistical uncertainties. The limits for $\mestar > 4$~\TeV\ are the result of extrapolation. The individual observed lower limits for the \eejj (same as (a)) and the \enuJ (same as (b)) channels are shown with the blue dot-and-dash lines in (c) for the reference. The exclusion limit set by ATLAS in the $ee\gamma$ search channel~\cite{Aad:2013jja} using 13~\ifb\ of data collected at \rts~=~8~\TeV\ is also shown with the red dotted line in (c).

The distributions of (a) \mJ, (b) \mTnuW, and (c) \absdphienu used to discriminate the signal and background processes in the \enuJ channel. The distributions are shown after applying the \emph{preselection} criteria. The background contributions are constrained using the CRs. The signal models assume \Lamb~=~5~\TeV. The last bin includes overflow events (the underflow is not shown). The ratio of the number of data events to the expected number of background events is shown with its statistical uncertainty in the lower panes. The hashed bands represent all considered sources of systematic and statistical uncertainties for the expected backgrounds.

The distributions of (a) \mJ, (b) \mTnuW, and (c) \absdphienu used to discriminate the signal and background processes in the \enuJ channel. The distributions are shown after applying the \emph{preselection} criteria. The background contributions are constrained using the CRs. The signal models assume \Lamb~=~5~\TeV. The last bin includes overflow events (the underflow is not shown). The ratio of the number of data events to the expected number of background events is shown with its statistical uncertainty in the lower panes. The hashed bands represent all considered sources of systematic and statistical uncertainties for the expected backgrounds.

The distributions of (a) \mJ, (b) \mTnuW, and (c) \absdphienu used to discriminate the signal and background processes in the \enuJ channel. The distributions are shown after applying the \emph{preselection} criteria. The background contributions are constrained using the CRs. The signal models assume \Lamb~=~5~\TeV. The last bin includes overflow events (the underflow is not shown). The ratio of the number of data events to the expected number of background events is shown with its statistical uncertainty in the lower panes. The hashed bands represent all considered sources of systematic and statistical uncertainties for the expected backgrounds.

The distributions of (a) \mll, (b) \st, and (c) \mlljj used to discriminate the signal from background processes in the \eejj channel. The distributions are shown after applying the \emph{preselection} criteria. The background contributions are constrained using the CRs. The signal models assume \Lamb~=~5~\TeV. The last bin includes overflow events (the underflow is not shown). The ratio of the number of data events to the expected number of background events with its statistical uncertainty is shown in the lower panes. The hashed bands represent all considered sources of systematic and statistical uncertainties in the SM background expectation.

The distributions of (a) \mll, (b) \st, and (c) \mlljj used to discriminate the signal from background processes in the \eejj channel. The distributions are shown after applying the \emph{preselection} criteria. The background contributions are constrained using the CRs. The signal models assume \Lamb~=~5~\TeV. The last bin includes overflow events (the underflow is not shown). The ratio of the number of data events to the expected number of background events with its statistical uncertainty is shown in the lower panes. The hashed bands represent all considered sources of systematic and statistical uncertainties in the SM background expectation.

Upper limits on $\sigma \times \mathcal{B}$ as a function of \mestar in (a) the \eejj channel and (b) the \enuJ channel. The $\pm1(2)\sigma$ uncertainty bands around the expected limit represent all sources of systematic and statistical uncertainties.

Feynman diagrams for (a) \eestartoeeqqbar and (b) \eestartoenuW.

Branching ratios for excited electrons as a function of \mestar. The scale $\Lambda$ is set to 10~\TeV.

Feynman diagrams for (a) \eestartoeeqqbar and (b) \eestartoenuW.

The distributions of (a) \mll, (b) \st, and (c) \mlljj used to discriminate the signal from background processes in the \eejj channel. The distributions are shown after applying the \emph{preselection} criteria. The background contributions are constrained using the CRs. The signal models assume \Lamb~=~5~\TeV. The last bin includes overflow events (the underflow is not shown). The ratio of the number of data events to the expected number of background events with its statistical uncertainty is shown in the lower panes. The hashed bands represent all considered sources of systematic and statistical uncertainties in the SM background expectation.