Azimuthal correlations of prompt D mesons with charged particles in pp and p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV

Abstract

The measurement of the azimuthal-correlation function of prompt D mesons with charged particles in pp collisions at $\sqrt{s}$ = 5.02 TeV and p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV with the ALICE detector at the LHC is reported. The D${}^0$, D${}^{+}$, and D${}^{\ast +}$ mesons, together with their charge conjugates, were reconstructed at midrapidity in the transverse momentum interval 3 < $p_{\mathrm{T}}$ < 24 GeV/c and correlated with charged particles having $p_{\mathrm{T}}$ > 0.3 GeV/c and pseudorapidity $|\eta |<$ 0.8. The properties of the correlation peaks appearing in the near- and away-side regions (for $\Delta \phi \approx$ 0 and $\Delta \phi \approx \pi$, respectively) were extracted via a fit to the azimuthal correlation functions. The shape of the correlation functions and the near- and away-side peak features are found to be consistent in pp and p-Pb collisions, showing no modifications due to nuclear effects within uncertainties. The results are compared with predictions from Monte Carlo simulations performed with the PYTHIA, POWHEG+PYTHIA, HERWIG, and EPOS 3 event generators.

35 pages, 11 captioned figures, 1 tables, authors from page 30, published version, figures at http://alice-publications.web.cern.ch/node/5650

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