Time & Place: Aug. 5, Monday,  10:00 am, Room 9409

Speaker: Prof. Zi-wei Lin (林子威), East Carolina University and Central
China Normal University


Title:  The AMPT Model Updated with New nPDFs and Improved Heavy Flavor
Productions


Abstract: Recently we have updated the AMPT model with new PDFs in nuclei,
including the CTEQ6.1M parton distribution functions for the free
nucleon and the EPS09s spatial-dependent nuclear shadowing functions.
Motivated by saturation physics, we have introduced a nuclear scaling
of the minijet cutoff scale p0 to describe the overall multiplicities
in central AA collisions at high energies.
We have also improved heavy flavor productions in the AMPT model,
where, from the comparison with the open charm world data for pp
collisions, we find that the minijet cutoff p0 cannot be applied to
heavy flavors. Therefore the nuclear scaling of p0 is more consistent
with final-state saturation models such as EKRT rather than
initial-state saturation models such as CGC.
The string melting version of the updated AMPT model can describe
light flavor productions at low pT in pp collisions and high energy AA
collisions. In addition, it describes the open charm data much better
than before. This thus lays the foundation for simultaneous studies of
heavy flavors and light flavors within the AMPT transport approach.