We present a detailed 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 for various light to strange quark mass ratios in the range, 0.05 0) and continuum (aT = 1/N_t -> 0) limits we find for the transition temperature at the physical point T_c r_0 = 0.457(7) where the scale is set by the Sommer-scale parameter r_0 defined as the distance in the static quark potential at which the slope takes on the value, (dV_qq(r)/dr)_r=r_0 = 1.65/r_0^2. Using the currently best known value for r_0 this translates to a transition temperature T_c = 192(7)(4)MeV. The transition temperature in the chiral limit is about 3% smaller. We discuss current ambiguities in the determination of T_c in physical units and also comment on the universal scaling behavior of thermodynamic quantities in the chiral limit.
The transition temperature in QCD
C. Schmidt,S. Datta,F. Karsch,C. Jung,P. Petreczky,T. Umeda,M. Cheng,N. Christ,R. Mawhinney,K. Petrov,O. Kaczmarek,E. Laermann,C. Miao,J. Heide,Ngo Sf,O. A.,O. G,N. Sg
Published 2006 in Physical Review D
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- Publication year
2006
- Venue
Physical Review D
- Publication date
2006-08-22
- Fields of study
Physics
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