Measurements of Four-Lepton Production at the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi></mml:math>Resonance in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mi>p</mml:mi></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msqrt><mml:mrow><mml:mi>s</mml:mi></mml:mrow></mml:msqrt><mml:mo>=</mml:mo><mml:mn>7</mml:mn></mml:mrow></mml:math>and 8 TeV with ATLAS

Measurements of four-lepton ($4\ensuremath{\ell}$, $\ensuremath{\ell}=e,\ensuremath{\mu}$) production cross sections at the $Z$ resonance in $pp$ collisions at the LHC with the ATLAS detector are presented. For dilepton and four-lepton invariant mass regions ${m}_{{\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}}>5\text{ }\mathrm{GeV}$ and $80<{m}_{4\ensuremath{\ell}}<100\text{ }\mathrm{GeV}$, the measured cross sections are $76\ifmmode\pm\else\textpm\fi{}18\text{(stat)}\ifmmode\pm\else\textpm\fi{}4\text{(syst)}\ifmmode\pm\else\textpm\fi{}1.4\text{(lumi)}\text{ }\text{ }\mathrm{fb}$ and $107\ifmmode\pm\else\textpm\fi{}9\text{(stat)}\ifmmode\pm\else\textpm\fi{}4\text{(syst)}\ifmmode\pm\else\textpm\fi{}3.0\text{(lumi)}\text{ }\text{ }\mathrm{fb}$ at $\sqrt{s}=7$ and 8 TeV, respectively. By subtracting the nonresonant $4\ensuremath{\ell}$ production contributions and normalizing with $Z\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ events, the branching fraction for the $Z$ boson decay to $4\ensuremath{\ell}$ is determined to be $(3.20\ifmmode\pm\else\textpm\fi{}0.25\text{(stat)}\ifmmode\pm\else\textpm\fi{}0.13\text{(syst)})\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}6}$, consistent with the standard model prediction.

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