  Double-parton scattering is investigated using events with a Z boson and
jets. The Z boson is reconstructed using only the dimuon channel. The
measurements are performed with proton-proton collision data recorded by the
CMS experiment at the LHC at $\sqrt{s} =$ 13 TeV, corresponding to an
integrated luminosity of 35.9 fb$^{-1}$ collected in the year 2016.
Differential cross sections of Z + $\geq$ 1 jet and Z + $\geq$ 2 jets are
measured with transverse momentum of the jets above 20 GeV and pseudorapidity
$|\eta|$ $\lt$ 2.4. Several distributions with sensitivity to double-parton
scattering effects are measured as functions of the angle and the transverse
momentum imbalance between the Z boson and the jets. The measured distributions
are compared with predictions from several event generators with different
hadronization models and different parameter settings for multiparton
interactions. The measured distributions show a dependence on the hadronization
and multiparton interaction simulation parameters, and are important input for
future improvements of the simulations.
