  The differential cross-section of prompt inclusive production of long-lived
charged particles in proton-proton collisions is measured using a data sample
recorded by the LHCb experiment at a centre-of-mass energy of ${\sqrt{s} =
13\,\mathrm{TeV}}$. The data sample, collected with an unbiased trigger,
corresponds to an integrated luminosity of ${5.4\,\mathrm{nb}^{-1}}$. The
differential cross-section is measured as a function of transverse momentum and
pseudorapidity in the ranges ${p_\mathrm{T} \in [0.08,
10)\,\mathrm{GeV}\,c^{-1}}$ and ${\eta \in [2.0, 4.8)}$ and is determined
separately for positively and negatively charged particles. The results are
compared with predictions from various hadronic-interaction models.
