Speakers
Peter Petreczky
(BNL)
Peter Petreczky
(BNL)
Description
The heavy quarks are one of the most versatile probes of the strongly
coupled QCD medium created in the heavy ion collision experiments.
However, the interactions of the heavy quarks or heavy quark bound
states with the strongly coupled medium is still not well understood.
One of the ways to look at such interactions is to study the behaviour
of open charm hadrons in the thermalized medium.
In our earlier study [1] we have shown that open charm hadrons
are the relevant degrees of freedom below the QCD transition temperature.
However, very little is known about the excitations of the charm degrees
of freedom above the QCD transition temperature.
In this work we study the nature of the
excitations carrying charm in deconfined QCD medium from first
principles using the lattice data on fluctuations of charm and its
correlations with baryon number and strangeness. Assuming that
the total charm pressure can be written as the sum of the partial
pressures of charm mesons, charm baryons and charm quarks we
extract the corresponding partial pressures from the lattice data.
We observe that the partial meson and baryon pressures
are significant till temperatures of about 200 MeV, implying
that meson and baryon excitations survive well beyond the QCD transition
temperature till about 200 MeV. Above that temperature quark
like excitations start dominating. We also probe the relative importance
of excitations carrying different quantum numbers,
specifically we show that possible diquark excitations carrying a
charm quantum number are not important for thermodynamics.
Our studies could be important in understanding the
energy loss mechanism and flow of the heavy quarks in the QGP as
well as the hadronization mechanism of the open charm states.
Reference:
A. Bazavov, et.al., Physics Letters B 737, 210 (2014) .
| On behalf of collaboration: | NONE |
|---|
Primary authors
Peter Petreczky
(BNL)
Dr
Sayantan Sharma
(Brookhaven National Laboratory)
Dr
Swagato Mukherjee
(Brookhaven National Laboratory)
