  The production of single top quarks is a cornerstone in understanding the
nature of the heaviest known elementary particle and its involvement in
electroweak interactions. An early differential cross section measurement of
t-channel single-top-quark production is presented. Proton-Proton collision
data at a center-of-mass energy of $13~\mathrm{TeV}$ collected in 2015 were
analyzed, corresponding to $2.3~\mathrm{fb}^{-1}$. The amount of signal events
as a function of the top quark transverse momentum and rapidity is estimated
using a multivariate discriminant. The results are unfolded to parton level and
compared to predictions by various Monte-Carlo generators.
