منابع مشابه
QCD sum rules at finite temperature
We derive a thermal QCD sum rule for the correlation function of two vector currents in the rho-meson channel. It takes into account the non-perturbative contributions of the additional , O(3)-invariant operators, which appear due to the breakdown of Lorentz invariance at finite temperature. The mixing of the new operators has a drastic effect on their coefficients. Also our evaluation of the t...
متن کاملPions at Finite Temperature from QCD Sum Rules
The temperature corrections to the current algebra Gell-Mann, Oakes, and Renner (GMOR) relation in SU(2)⊗SU(2) are investigated in the framework of QCD sum rules. There are no corrections at leading order in the quark masses. At the next to leading order we find corrections of the form mq T 2, which are small except near the critical temperature. As a by-product we obtain the temperature behavi...
متن کاملQCD sum rules at low temperature.
We discuss finite-temperature QCD sum rules at low temperatures, including perturbative as well as nonperturbative thermal corrections. The electric and magnetic condensates of the thermalized QCD state are extracted from present lattice calculations of the energy density and pressure. Alternative parametrizations based on instanton calculations and string behavior at finite temperature are als...
متن کاملFinite-temperature QCD sum rules for the nucleon.
Using the QCD sum rules, we investigate the effects of temperature on the nucleon below the phase transition. The mass and width of the nucleon are analyzed using various parametrizations of the nucleon continuum. Overall, the nucleon mass is found to depend substantially on temperature variations in the quark condensate, irrespective of the continuum parametrization. Our results are compared w...
متن کاملFinite energy chiral sum rules in QCD
The saturation of QCD chiral sum rules of the Weinberg-type is analyzed using ALEPH and OPAL experimental data on the difference between vector and axial-vector correlators (V-A). The sum rules exhibit poor saturation up to current energies below the tau-lepton mass. A remarkable improvement is achieved by introducing integral kernels that vanish at the upper limit of integration. The method is...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 1998
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.58.096011