Studies of Higgs boson properties are presented using the ${\rm H}\rightarrow{\rm Z}{\rm Z}\rightarrow4\ell$ ($\ell={\rm e},\mu$) decay channel. These studies are performed using a data sample corresponding to an integrated luminosity of 12.9~{\rm fb}^{-1} of pp collisions at a center-of-mass energy of 13~{\rm TeV} collected by the CMS experiment at the LHC during 2016. The observed significance for the standard model Higgs boson with m_{{\rm H}}=125.09~{\rm GeV} is $6.2\sigma$, where the expected significance is $6.5\sigma$. The signal strength modifier $\mu$, defined as the production cross section of the Higgs boson times its branching fraction to four leptons relative to the standard model expectation, is measured to be $\mu=0.99^{+0.33}_{-0.26}$ at m_{\rm H}=125.09~{\rm GeV}. The signal-strength modifiers for the main Higgs boson production modes have also been constrained. The model independent fiducial cross section is measured to be 2.29^{+0.74}_{-0.64}({\rm stat.})^{+0.30}_{-0.23}({\rm sys.})^{+0.01}_{-0.05}({\rm model~dep.})~{\rm fb} and differential cross sections as a function of the $p_{\rm T}$ of the Higgs boson and the number of associated jets are determined. The mass is measured to be m_{{\rm H}}=124.50^{+0.48}_{-0.46}~{\rm GeV} and the width is constrained to be \Gamma_{{\rm H}}<41~{\rm MeV}. The anomalous effects in the Higgs interactions with a pair of Z bosons are constrained under the assumption of a spin-zero resonance. Finally, a search for an additional resonance decaying to ZZ is performed for a range of masses up to 2.5 TeV and with various widths and no significant excess is observed.

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