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

Abstract

The measurement of the azimuthal-correlation function of prompt D mesons with charged particles in pp collisions at $$\sqrt{s} =5.02\ \hbox {TeV}$$ s = 5.02 TeV and p–Pb collisions at $$\sqrt{s_{\mathrm{NN}}} = 5.02\ \hbox {TeV}$$ s NN = 5.02 TeV with the ALICE detector at the LHC is reported. The $$\mathrm{D}^{0}$$ D 0 , $$\mathrm{D}^{+} $$ D + , and $$\mathrm{D}^{*+} $$ D ∗ + mesons, together with their charge conjugates, were reconstructed at midrapidity in the transverse momentum interval $$3< p_\mathrm{T} < 24\ \hbox {GeV}/c$$ 3 < p T < 24 GeV / c and correlated with charged particles having $$p_\mathrm{T} > 0.3\ \hbox {GeV}/c$$ p T > 0.3 GeV / c and pseudorapidity $$|\eta | < 0.8$$ | η | < 0.8 . The properties of the correlation peaks appearing in the near- and away-side regions (for $$\Delta \varphi \approx 0$$ Δ φ ≈ 0 and $$\Delta \varphi \approx \pi $$ Δ φ ≈ π , 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.

Azimuthal correlations of D mesons with charged particles in simulations with the ALICE experiment

“…Recent ALICE results on the azimuthal correlation distribution of prompt D mesons with charged hadrons in pp and p-Pb collisions at √ s NN = 5.02 TeV are qualitatively described by several LO and NLO simulations [3]. Among these, PYTHIA 8, which includes MPI and colour reconnection description, well describes the measured correlations.…”

“…Charged hadrons are selected in |η| < 0.8, with a similar method to that outlined in Ref. [3]. The azimuthal-correlation distributions are examined in the pseudorapidity-difference range |∆η| < 1 for four D-meson p T ranges, 3 < p D T < 5 GeV/c, 5 < p D T < 8 GeV/c, 8 < p D T < 16 GeV/c, and 16 < p D T < 24 GeV/c.…”

“…ALICE reported the azimuthal correlation distributions of prompt D mesons with charged particles in pp and p-Pb collisions at √ s NN = 5.02 TeV [3]. The transverse momentum (p T ) evolution of the near-and away-side peaks are found to be consistent in pp and p-Pb collisions, in the whole p T range.…”

Heavy-flavour jet production and correlations with ALICE

“…The angular correlation of D 0 , D + and D * + mesons with charged particles were studied. The correlation functions and the near-and away-side peak properties are found to be consistent in pp and p-Pb collisions, showing no modifications due to nuclear effects within uncertainties [11]. jets does not appear to be affected by cold nuclear matter effects within current uncertainties.…”

Charm jet and correlation measurements with ALICE in pp and p -- Pb collisions at the LHC

“…As detailed in Ref. [8] with pp and p-Pb data at √ s NN = 5.02 TeV, a differential study in p D T and in p assoc T is performed to understand the evolution of the charm jet-shape and its composition. Moreover, the comparison of the results in the two collision systems provides a good agreement within statistical uncertainties.…”