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Spectra of lepton \pt\ (top), \met\ (centre) and \mt\ (bottom) for the electron (left) and muon (right) channels after the event selection. The spectra of \pt\ and \met\ are shown with the requirement \mt\ $>$ 252 \gev. The points represent data and the filled, stacked histograms show the predicted backgrounds. Open histograms are \wpl\ signals added to the background with their masses in \gev\ indicated in parentheses in the legend. The signal and background samples are normalised using the integrated luminosity of the data and the NNLO cross-sections listed in tables~\ref{tab:xsec_sig} and~\ref{tab:xsec_bg}, except for the \QCDBg\ which is estimated from data. The error bars on the data points are statistical. The ratio of the data to the total background prediction is shown below each of the distributions. The bands represent the systematic uncertainties on the background including the ones arising from the statistical uncertainty of the simulated samples.

Spectra of lepton \pt\ (top), \met\ (centre) and \mt\ (bottom) for the electron (left) and muon (right) channels after the event selection. The spectra of \pt\ and \met\ are shown with the requirement \mt\ $>$ 252 \gev. The points represent data and the filled, stacked histograms show the predicted backgrounds. Open histograms are \wpl\ signals added to the background with their masses in \gev\ indicated in parentheses in the legend. The signal and background samples are normalised using the integrated luminosity of the data and the NNLO cross-sections listed in tables~\ref{tab:xsec_sig} and~\ref{tab:xsec_bg}, except for the \QCDBg\ which is estimated from data. The error bars on the data points are statistical. The ratio of the data to the total background prediction is shown below each of the distributions. The bands represent the systematic uncertainties on the background including the ones arising from the statistical uncertainty of the simulated samples.

Spectra of lepton \pt\ (top), \met\ (centre) and \mt\ (bottom) for the electron (left) and muon (right) channels after the event selection. The spectra of \pt\ and \met\ are shown with the requirement \mt\ $>$ 252 \gev. The points represent data and the filled, stacked histograms show the predicted backgrounds. Open histograms are \wpl\ signals added to the background with their masses in \gev\ indicated in parentheses in the legend. The signal and background samples are normalised using the integrated luminosity of the data and the NNLO cross-sections listed in tables~\ref{tab:xsec_sig} and~\ref{tab:xsec_bg}, except for the \QCDBg\ which is estimated from data. The error bars on the data points are statistical. The ratio of the data to the total background prediction is shown below each of the distributions. The bands represent the systematic uncertainties on the background including the ones arising from the statistical uncertainty of the simulated samples.

Spectra of lepton \pt\ (top), \met\ (centre) and \mt\ (bottom) for the electron (left) and muon (right) channels after the event selection. The spectra of \pt\ and \met\ are shown with the requirement \mt\ $>$ 252 \gev. The points represent data and the filled, stacked histograms show the predicted backgrounds. Open histograms are \wpl\ signals added to the background with their masses in \gev\ indicated in parentheses in the legend. The signal and background samples are normalised using the integrated luminosity of the data and the NNLO cross-sections listed in tables~\ref{tab:xsec_sig} and~\ref{tab:xsec_bg}, except for the \QCDBg\ which is estimated from data. The error bars on the data points are statistical. The ratio of the data to the total background prediction is shown below each of the distributions. The bands represent the systematic uncertainties on the background including the ones arising from the statistical uncertainty of the simulated samples.

Spectra of lepton \pt\ (top), \met\ (centre) and \mt\ (bottom) for the electron (left) and muon (right) channels after the event selection. The spectra of \pt\ and \met\ are shown with the requirement \mt\ $>$ 252 \gev. The points represent data and the filled, stacked histograms show the predicted backgrounds. Open histograms are \wpl\ signals added to the background with their masses in \gev\ indicated in parentheses in the legend. The signal and background samples are normalised using the integrated luminosity of the data and the NNLO cross-sections listed in tables~\ref{tab:xsec_sig} and~\ref{tab:xsec_bg}, except for the \QCDBg\ which is estimated from data. The error bars on the data points are statistical. The ratio of the data to the total background prediction is shown below each of the distributions. The bands represent the systematic uncertainties on the background including the ones arising from the statistical uncertainty of the simulated samples.

Spectra of lepton \pt\ (top), \met\ (centre) and \mt\ (bottom) for the electron (left) and muon (right) channels after the event selection. The spectra of \pt\ and \met\ are shown with the requirement \mt\ $>$ 252 \gev. The points represent data and the filled, stacked histograms show the predicted backgrounds. Open histograms are \wpl\ signals added to the background with their masses in \gev\ indicated in parentheses in the legend. The signal and background samples are normalised using the integrated luminosity of the data and the NNLO cross-sections listed in tables~\ref{tab:xsec_sig} and~\ref{tab:xsec_bg}, except for the \QCDBg\ which is estimated from data. The error bars on the data points are statistical. The ratio of the data to the total background prediction is shown below each of the distributions. The bands represent the systematic uncertainties on the background including the ones arising from the statistical uncertainty of the simulated samples.

Observed and expected limits on \xbr\ for \wp\ (left) and $W^{*}$ (right) at 95\% CL in the electron channel (top), muon channel (centre) and the combination (bottom) assuming the same branching fraction for both channels. The predicted values for \xbr\ and their uncertainties (except for $W^{*}$) are also shown. The calculation of uncertainties on the \wp\ cross-sections is explained in section \ref{sec:mcSim}.

Observed and expected limits on \xbr\ for \wp\ (left) and $W^{*}$ (right) at 95\% CL in the electron channel (top), muon channel (centre) and the combination (bottom) assuming the same branching fraction for both channels. The predicted values for \xbr\ and their uncertainties (except for $W^{*}$) are also shown. The calculation of uncertainties on the \wp\ cross-sections is explained in section \ref{sec:mcSim}.

Observed and expected limits on \xbr\ for \wp\ (left) and $W^{*}$ (right) at 95\% CL in the electron channel (top), muon channel (centre) and the combination (bottom) assuming the same branching fraction for both channels. The predicted values for \xbr\ and their uncertainties (except for $W^{*}$) are also shown. The calculation of uncertainties on the \wp\ cross-sections is explained in section \ref{sec:mcSim}.

Observed and expected limits on \xbr\ for \wp\ (left) and $W^{*}$ (right) at 95\% CL in the electron channel (top), muon channel (centre) and the combination (bottom) assuming the same branching fraction for both channels. The predicted values for \xbr\ and their uncertainties (except for $W^{*}$) are also shown. The calculation of uncertainties on the \wp\ cross-sections is explained in section \ref{sec:mcSim}.

Observed and expected limits on \xbr\ for \wp\ (left) and $W^{*}$ (right) at 95\% CL in the electron channel (top), muon channel (centre) and the combination (bottom) assuming the same branching fraction for both channels. The predicted values for \xbr\ and their uncertainties (except for $W^{*}$) are also shown. The calculation of uncertainties on the \wp\ cross-sections is explained in section \ref{sec:mcSim}.

Observed and expected limits on \xbr\ for \wp\ (left) and $W^{*}$ (right) at 95\% CL in the electron channel (top), muon channel (centre) and the combination (bottom) assuming the same branching fraction for both channels. The predicted values for \xbr\ and their uncertainties (except for $W^{*}$) are also shown. The calculation of uncertainties on the \wp\ cross-sections is explained in section \ref{sec:mcSim}.

Observed limits on $M_{*}$ as a function of the DM particle mass ($m_{\chi}$) at 90\% CL for the combination of the electron and muon channel, for various operators as described in the text. For each operator, the values below the corresponding line are excluded. No signal samples are generated for masses below 1 \GeV\ but the limits are expected to be stable down to arbitrarily small values. Results of the previous ATLAS searches for hadronically decaying $W/Z$~\cite{atlasWIMPhadronicWZ} and leptonically decaying $Z$~\cite{atlasWIMPleptonicZ} are also shown.

Observed limits on the DM--nucleon scattering cross-section as a function of $m_{\chi}$ at 90\% CL for spin-independent (left) and spin-dependent (right) operators in the EFT. Results are compared with the previous ATLAS searches for hadronically decaying $W/Z$~\cite{atlasWIMPhadronicWZ}, leptonically decaying $Z$~\cite{atlasWIMPleptonicZ}, and $j+\chi\chi$~\cite{atlasWIMPjet}, and with direct detection searches by CoGeNT~\cite{2011PhRvL.106m1301A}, XENON100~\cite{2012PhRvL.109r1301A}, CDMS~\cite{2014PhRvL.112d1302A,2014arXiv1402.7137A}, LUX~\cite{2013arXiv1310.8214L}, COUPP~\cite{2012PhRvD..86e2001B}, SIMPLE~\cite{2012PhRvL.108t1302F}, PICASSO~\cite{2012PhLB..711..153A} and IceCube~\cite{2012arXiv1212.4097I}. The comparison between direct detection and ATLAS results is only possible within the limits of the validity of the EFT~\cite{wimp14TeV}.