3 research outputs found
Transition temperature in QCD with physical light and strange quark masses
We present results from a calculation of the transition temperature in QCD
with two light and one heavier (strange) quark mass on lattices with temporal
extent N_t =4 and 6. Calculations with improved staggered fermions have been
performed with a strange quark mass fixed close to its physical value and for
various light to strange quark mass ratios that correspond to light
pseudo-scalar masses in the range (150-500) MeV. From a combined extrapolation
to the chiral (m_l -> 0) and continuum (aT -> 0) limits we obtain for the
transition temperature at the physical point T_c = 192(7)(4) MeV.
We also present first results from an ongoing calculation of the QCD equation
of state with almost realistic light and strange quark masses.Comment: 4 pages, 4 figures, to appear in the proceedings of the 19th
International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions,
Shanghai, Nov. 200
Heavy quark thermodynamics in full QCD
We analyze the large-distance behaviour of static quark-anti-quark pair
correlations in QCD. The singlet free energy is calculated and the entropy
contribution to it is identified allowing us to calculate the excess internal
energy. The free energy has a sharp drop in the critical region, leading to
sharp peaks in both excess entropy and internal energy.Comment: talk given at Quark Matter 200