Speaker
CHI YANG
(USTC)
Description
One important physics goal of ultra-relativistic heavy-ion collisions is
to study the fundamental properties of a hot, dense medium created in these collisions.
This medium is expected to emit thermal radiation in the
form of direct photons and dileptons. Once produced, photons and leptons
traverse the strongly interacting medium with minimal interactions.
The fully installed Time-of-Flight Detector in 2010 enables clean electron
identification from low to intermediate transverse momentum ($p_{T}$). In this
talk, we will present the direct virtual photon production for $1 < p_{T} < 10$ GeV/$c$
derived from the dielectron continuum in the dielectron invariant mass region $0.1 < M_{ee} < 0.3$ GeV/$c^{2}$
from one billion $\sqrt{s_{NN}}$ = 200 GeV Au+Au minimum bias events taken in years 2010 and 2011.
Comparisons to model calculations including hadronic and partonic thermal radiation will be made for the direct virtual photon in Au+Au collisions.
Author
CHI YANG
(USTC)
