Speaker
Guannan Xie
(LBNL/USTC)
Description
The mass of charm quarks is larger than the scales of the medium
created in heavy-ion collisions at RHIC energies (mc >>
ΛQCD, T, mu,d,s ). Therefore, charm production
is mainly feasible in the primordial nucleon-nucleon collisions and
experience all the subsequent stages of the medium evolution. The
modification of charm quark production in heavy -ion collisions and
signatures of their interactions with the created medium are imprinted
on the final kinematics of charmed mesons which can be studied
experimentally using Nuclear Modification Factors (NMFs). Recent
measurement of D0 NMFs has shown rich enhancement and
suppression structures in different transverse-momentum regions that
shed light on the intricate interplay of Cold Nuclear Matter effects,
collectivity with the bulk matter, hadronization mechanisms and energy
loss of charm quarks in heavy-ion collisions. Higher precision
measurements of NMFs are instrumental for accurately delineating the
roles of these different mechanisms, their system size and kinematics
dependencies, and can ultimately help in extracting medium parameters.
To this end, we will discuss the topological reconstruction of D
mesons via their hadronic decay channels (D0 → Kπ,
D+/-→ K π π and D*+/- →D0 π → K π π)
utilizing STAR’s recently installed Heavy Flavor Tracker for secondary
vertex identification. We will also discuss transverse-momentum and
centrality dependence of D meson productions and NMFs and compare them
with published data from RHIC and the LHC experiments as well as with
model calculations for heavy quark production and energy loss in heavy
-ion collisions.
| On behalf of collaboration: | STAR |
|---|
Author
Guannan Xie
(LBNL/USTC)
