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Measurements of four-lepton (4$\ell$, $\ell=e,\mu$) production cross sectionsat the $Z$ resonance in $pp$ collisions at the LHC with the ATLAS detector arepresented. For dilepton and four-lepton invariant mass region $m_{\ell^+\ell^-}> 5$ GeV and $80 < m_{4\ell} < 100$ GeV, the measured cross sections are $76\pm 18 \text { (stat) } \pm 4 \text { (syst) } \pm 1.4 \text { (lumi) }$ fb and$107 \pm 9 \text{ (stat) } \pm 4 \text{ (syst) } \pm 3.0 \text { (lumi) }$ fbat $\sqrt s$ = 7 and 8 TeV, respectively. By subtracting the non-resonant4$\ell$ production contributions and normalizing with $Z\rightarrow \mu^+\mu^-$events, the branching fraction for the $Z$ boson decay to $4\ell$ is determinedto be $\left( 3.20 \pm 0.25\text{ (stat)} \pm 0.13\text{ (syst)} \right) \times10^{-6}$, consistent with the Standard Model prediction.

physical review letters

Measurement of the 4l Cross Section at the Z Resonance and Determination  of the Branching Fraction of Z->4l in pp Collisions at sqrt(s) = 7 and 8 TeV  with ATLAS