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Angular correlations of heavy-flavour and charged particles in high-energyproton-proton collisions are sensitive to the production mechanisms of heavyquarks and to their fragmentation as well as hadronisation processes. Themeasurement of the azimuthal-correlation function of prompt D mesons withcharged particles in proton-proton collisions at a centre-of-mass energy of$\sqrt{s} = 13$ TeV with the ALICE detector is reported, considering D$^{0}$,D$^{+}$, and D$^{*+}$ mesons in the transverse-momentum interval $3 < p_{\rm T}< 36$ GeV/$c$ at midrapidity ($|y| < 0.5$), and charged particles with $p_{\rmT} > 0.3$ GeV/$c$ and pseudorapidity $|\eta| < 0.8$. This measurement has animproved precision and provides an extended transverse-momentum coveragecompared to previous ALICE measurements at lower energies. The study is alsoperformed as a function of the charged-particle multiplicity, showing nomodifications of the correlation function with multiplicity withinuncertainties. The properties and the transverse-momentum evolution of thenear- and away-side correlation peaks are studied and compared with predictionsfrom various Monte Carlo event generators. Among those considered, PYTHIA8 andPOWHEG+PYTHIA8 provide the best description of the measured observables. Theobtained results can provide guidance on tuning the generators.

european physical journal. c, particles and fields

Investigating charm production and fragmentation via azimuthal  correlations of prompt D mesons with charged particles in pp collisions at  $\sqrt{s} = 13$ TeV