Abstract
Heavy quarks (charm and beauty) are produced in initial hard scattering processes in heavy-ion collisions, before the formation of a strongly-interacting medium, the Quark-Gluon Plasma (QGP). The measurement of angular correlations between open heavy-flavour hadrons and charged particles can provide insight into the effects of the medium on charm and beauty production. For instance, in Pb-Pb collisions, the azimuthal correlations can provide information on the energy-loss mechanisms of heavy quarks in the QGP. Additionally, azimuthal correlations are sensitive to possible modifications of the heavy-quark parton shower and hadronisation in the presence of the medium. The observed double-ridge long-range correlations between light hadrons in p-Pb collisions could originate from a collective expansion of the system, as well as from gluon saturation in the initial state (color-glass condensate). The same effect can be studied for heavier quarks via the correlation between heavy-flavour hadrons (or their decay electrons) and charged particles. In pp collisions, the azimuthal correlations allow to measure the beauty production cross section as well as they represent a powerful tool to test pQCD models.
Highlights
The transverse-momentum differential production cross section of D mesons and electrons from heavy-flavour hadron decays at central rap√idity has been measure√d by the ALICE colla√boration in pp, p-Pb and Pb-Pb collisions at s = 2.76 and 7 TeV, sNN = 5.02 TeV and sNN = 2.76 TeV, respectively [1, 2, 3, 4, 5, 6, 8, 7]
Further insight into the charm energy loss mechanism in the Quark-Gluon Plasma (QGP) can be obtained with measurements of angular correlations between heavy-flavour hadrons and the charged particles produced in the same di-jet as the heavy quark
The D meson–charged particle azimuthal correlation analysis has been performed on a data sample of 3.14 · 108 minimum bias pp collisions and 1.3 · 108 minimum bias p-Pb collisions
Summary
This content has been downloaded from IOPscience. Please scroll down to see the full text. Ser. 636 012002 (http://iopscience.iop.org/1742-6596/636/1/012002) View the table of contents for this issue, or go to the journal homepage for more. Download details: IP Address: 131.169.4.70 This content was downloaded on 29/04/2016 at 23:04 Please note that terms and conditions apply
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