Abstract
The measurement of the azimuthal-correlation function of prompt D mesons with charged particles in pp collisions at sqrt{s} =5.02 hbox {TeV} and p–Pb collisions at sqrt{s_{mathrm{NN}}} = 5.02 hbox {TeV} with the ALICE detector at the LHC is reported. The mathrm{D}^{0}, mathrm{D}^{+} , and mathrm{D}^{*+} mesons, together with their charge conjugates, were reconstructed at midrapidity in the transverse momentum interval 3< p_mathrm{T} < 24 hbox {GeV}/c and correlated with charged particles having p_mathrm{T} > 0.3 hbox {GeV}/c and pseudorapidity |eta | < 0.8. The properties of the correlation peaks appearing in the near- and away-side regions (for Delta varphi approx 0 and Delta varphi 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.
Highlights
Two-particle angular correlations allow the mechanisms of particle production to be investigated and the event properties of ultra-relativistic hadronic collisions to be studied
The central-barrel detectors used in the analysis presented in this paper, employed for chargedparticle reconstruction and identification at midrapidity, are the Inner Tracking System (ITS), the Time Projection Chamber (TPC), and the Time-Of-Flight detector (TOF)
The correlation functions of D mesons with associated particles for p–Pb collisions in the 0–20%, 20–60%, and 60–100% centrality classes are compared in Fig. 6, for nine kinematic ranges with 3 < pTD < 16 GeV/c and pTassoc > 0.3 GeV/c
Summary
Two-particle angular correlations allow the mechanisms of particle production to be investigated and the event properties of ultra-relativistic hadronic collisions to be studied. A positive ellipticflow coefficient was observed for heavy-flavour particles, from the analysis of their azimuthal correlations with charged particles, by the ALICE [43,44,45], ATLAS [46,47,48], and CMS [49,50] Collaborations This approach generally assumes that the jet-induced correlation peaks do not differ in low- and high-multiplicity collisions, i.e. nuclear effects have the same impact on the heavy-quark fragmentation and hadronisation at different event multiplicities. This assumption can be tested by looking for modifications of the azimuthal-correlation function.
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