Quark-number susceptibility, thermodynamic sum rule, and the hard thermal loop approximation
نویسندگان
چکیده
منابع مشابه
Comparing different hard-thermal-loop approaches to quark number susceptibilities
We compare our previously proposed hard-thermal-loop (HTL) resummed calculation of quark number susceptibilities using a self-consistent two-loop approximation to the quark density with a recent calculation of the same quantity at the one-loop level in a variant of HTL-screened perturbation theory. Besides pointing out conceptual problems with the latter approach, we show that it severely over-...
متن کاملHeavy Quark Masses from Sum Rules in Four-Loop Approximation
New data for the total cross section σ(e+e− → hadrons) in the charm and bottom threshold region are combined with an improved theoretical analysis, which includes recent four-loop calculations, to determine the short distance MS charm and bottom quark masses. A detailed discussion of the theoretical and experimental uncertainties is presented. The final result for the MS-masses, mc(3 GeV) = 0.9...
متن کاملSelf - consistent hard - thermal - loop thermodynamics for the quark - gluon plasma ⋆
Self-consistent approximations allowing the calculation of the entropy and the baryon density of a quark-gluon plasma are presented. These approximations incorporate the essential physics of the hard thermal loops, involve only ultraviolet-finite quantities , and are free from overcounting ambiguities. While being nonperturbative in the strong coupling constant g, agreement with ordinary pertur...
متن کاملHard-thermal-loop Resummation of the Free Energy of a Hot Quark-Gluon Plasma
The quark contribution to the free energy of a hot quark-gluon plasma is calculated to leading order in hard-thermal-loop (HTL) perturbation theory. This method selectively resums higher order corrections associated with plasma effects, such as screening, quasiparticles, and Landau damping. Comparing to the weak-coupling expansion of QCD, the error in the one-loop HTL free energy is of order αs...
متن کاملHard Thermal Loops , Quark - Gluon Plasma Response
I outline various derivations of the non-Abelian Kubo equation, which governs the response of a quark-gluon plasma to hard thermal perturbations. In the static case, it is proven that gauge theories do not support hard thermal solitons. Explicit solutions are constructed within an SU (2) Ansatz and they are shown to support the general result. The time-dependent problem, i.e., non-Abelian plasm...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review D
سال: 2003
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.68.085012