Speaker
Xin Li
(STAR Collaboration)
Description
The dependence of parton energy loss on the space-time evolution of the QCD
medium is believed to be mostly responsible for the azimuthal angular
anisotropy distribution of high transverse momentum (pT) particles in
nucleus-nucleus collisions. Simultaneous measurements of both the nuclear
modification factors and the elliptic flow parameter v2 can provide insights
on parton energy loss mechanisms and space-time evolutions of the colliding
system. Heavy quarks are particularly effective probes because their initial
production can be reliably calculated from pQCD approaches and their final
states reflect directly evolutions through the strongly interacting partonic
medium created in heavy ion collisions. We will present the STAR
non-photonic electron (NPE) measurements at high pT from p+p and Au+Au
collisions. The data were taken during run 2009 and run 2010, where
unprecedented amount of data have been collected with detector
configurations for minimum photonic conversion background. Both the nuclear
modification factors and the v2 measurements will be reported as a function
of pT and collision centralities. Comparisons with theoretical model
calculations and possible constraints on properties of the partonic medium
will be discussed.
Author
Xin Li
(STAR Collaboration)
