Abstract
A study of azimuthal correlations between D0, D+, and D*+ and charged particles in pp collisions at = 7 TeV and p-Pb collisions at = 5.02 TeV is presented. D mesons were reconstructed from their hadronic decays at central rapidity (|y| < 0.5) in the transverse momentum range 3 < pDT < 16 GeV/c and they were correlated with charged particles reconstructed in the pseudorapidity range |η| < 0.8. Perspectives for the measurement in Pb-Pb collisions at = 5.5 TeV after the ALICE upgrade are presented as well.
Highlights
Such a study is of great importance in pp and p–Pb collisions
Due to the limited statistics available, the fully corrected 2D correlations were projected onto the ∆φ axis, producing azimuthal correlation distributions, which were normalized to the number of trigger D mesons
A more quantitative comparison between pp and p–Pb results for the near-side region can be performed by extracting the per-trigger yield in the near-side peaks from the fit function applied to the correlation distributions
Summary
Such a study is of great importance in pp and p–Pb collisions. In pp collisions it allows us to characterize charm-quark jets and study their properties, providing at the same time a reference for the measurements in p–Pb and Pb–Pb collisions. In p–Pb collisions it enables the study of cold nuclear matter effects and the search, in the heavy-flavour sector, for longrange ridge-like structures (“double ridge”) in near and away-side regions, already observed in hadron-hadron correlations [7]. The selected D-meson candidates in the signal region (±2σ from the centre of the signal peak in the invariant mass distribution) were correlated with charged particles (associated tracks) within |η| < 0.8 and satisfying a selection on their reconstruction quality.
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