as a separate systematic effect. Due to the strong dependence of the cross section times branching fraction on the mass of the Higgs boson ($m_{\PH}$) in the region around 125, the measurements are performed assuming a mass of $m_{\PH} = 125.0\GeV$, as measured by the CMS experiment using the ${\ensuremath{\PH \to 4\ell}\xspace}$ and $\PH \to 2\gamma$ channels [@CMS:2014ega]. This approach also allows an easier comparison of measurements with the theoretical estimations.

The differential fiducial cross sections are measured as a function of several kinematic observables that are sensitive to the Higgs boson production mechanism: transverse momentum and rapidity of the four-lepton system, transverse momentum of the leading jet, separation in rapidity between the Higgs boson candidate and the leading jet, as well as the accompanying jet multiplicity. In addition, measurements of the ${\ensuremath{\PZ \to 4\ell}\xspace}$ fiducial cross section, and of its ratio to the corresponding ${\ensuremath{\PH \to 4\ell}\xspace}$ fiducial cross section are also performed using the 8 TeV data. These measurements provide tests of the SM expectations, and important validations of our understanding of the detector response and methodology used for the ${\ensuremath{\PH \to 4\ell}\xspace}$ cross section measurement. The results of the ${\ensuremath{\PH \to 4\ell}\xspace}$ cross section measurements are compared 