4 research outputs found
Correlations of Heavy Quarks Produced at Large Hadron Collider
We study the correlations of heavy quarks produced in relativistic heavy ion
collisions and find them to be quite sensitive to the effects of the medium and
the production mechanisms. In order to put this on a quantitative footing, as a
first step, we analyze the azimuthal, transverse momentum, and rapidity
correlations of heavy quark-anti quark () pairs in
collisions at (). This sets the stage for the
identification and study of medium modification of similar correlations in
relativistic collision of heavy nuclei at the Large Hadron Collider. Next we
study the additional production of charm quarks in heavy ion collisions due to
multiple scatterings, {\it viz.}, jet-jet collisions, jet-thermal collisions,
and thermal interactions. We find that these give rise to azimuthal
correlations which are quite different from those arising from prompt initial
production at leading order and at next to leading order.Comment: 26 pages, 15 figures. Three new figures added, comparison to
experimental data included, abstract and discussion expande
Empirical determination of charm quark energy loss and its consequences for azimuthal anisotropy
We propose an empirical model to determine the form of energy loss of charm
quarks due to multiple scatterings in quark gluon plasma by demanding a good
description of production of D mesons and non-photonic electrons in
relativistic collision of heavy nuclei at RHIC and LHC energies. Best results
are obtained when we approximate the momentum loss per collision , where is a constant depending on the
centrality and the centre of mass energy. Comparing our results with those
obtained earlier for drag coefficients estimated using Langevin equation for
heavy quarks we find that up to half of the energy loss of charm quarks at top
RHIC energy could be due to collisions while that at LHC energy at 2760 GeV/A
the collisional energy loss could be about one third of the total. Estimates
are obtained for azimuthal anisotropy in momentum spectra of heavy mesons, due
to this energy loss. We further suggest that energy loss of charm quarks may
lead to an enhanced production of D-mesons and single electrons at low in
AA collisions.Comment: 11 pages, 3 figures, Typographical errors corrected, Key-words and
PACS indices added, sequence of figures corrected, references added in
section 3, discussions expande