four-lepton final state via an intermediate pair of neutral electroweak bosons. A similar study of the Higgs boson production cross section using the ${\ensuremath{\PH \to 4\ell}\xspace}$ decay channel has already been performed by the ATLAS Collaboration [@Aad:2014tca], while measurements in the $\PH \to 2\gamma$ decay channel have been reported by both the ATLAS and CMS collaborations [@Aad:2014lwa; @CMS:HIG-14-016].

The integrated fiducial cross sections are measured using $\Pp \Pp$ collision data recorded with the CMS detector at the CERN LHC corresponding to integrated luminosities of [$5.1\fbinv$]{} at 7and [$19.7\fbinv$]{} at 8. The measurement of the ratio of cross sections at 7 and 8is also performed. The differential fiducial cross sections are measured using just the 8data, due to the limited statistics of the 7data set. The cross sections are corrected for effects related to detector efficiency and resolution. The fiducial phase space constitutes approximately 42% of the total available phase space, and there is no attempt to extrapolate the measurements to the full phase space. This approach is chosen to reduce the systematic uncertainty associated with the underlying model of the Higgs boson properties and production mechanism. The remaining dependence of each measurement on the model assumptions is determined and quoted 