Meson correlators at finite temperature (original) (raw)
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Hadronic Correlators at Finite Temperature
Progress of Theoretical Physics Supplement, 1997
We consider here equal time point to point spatial correlation functions of hadronic currents at finite temperature, with respect to a structure of the QCD vacuum in terms of quark antiquark condensates. Using the temperature dependence of quark condensates from chiral perturbation theory for low temperatures and from results of lattice QCD simulations at temperatures near the critical temperature, we calculate the correlation functions in a hot medium. This analysis at finite temperature would be of relevance to the study of Quark Gluon Plasma (QGP).
Meson correlators in finite temperature lattice QCD
Physical Review D, 2001
We analyze temporal and spatial meson correlators in quenched lattice QCD at T ≥ 0. Below T c we observe little change in the meson properties as compared with T = 0. Above T c we observe new features: chiral symmetry restoration and signals of plasma formation, but also indication of persisting "mesonic" (metastable) states and different temporal and spatial "masses" in the mesonic channels. This suggests a complex picture of QGP in the region 1 − 1.5 T c .
Hadronic correlators and condensate fluctuations in QCD vacuum
Physics Letters B, 1996
Phenomenological results of equal time, point to point spatial correlation functions of hadronic currents are used to deduce the structure of the QCD vacuum. It is found that a model with only quark condensate is not adequate to explain the observations. Inclusion of condensate fluctuations (explicit four point structure in the vacuum) leads to excellent overall agreement with the phenomenological curves and parameters in various channels. PACS number(s): 12.38.Gc
Field strength correlators in QCD at zero and non-zero temperature
Nuclear Physics B - Proceedings Supplements, 1997
We study, by numerical simulations on a lattice, the behaviour of the gauge-invariant field strength correlators in QCD both at zero temperature, down to a distance of 0.1 fm, and at finite temperature, across the deconfinement phase transition.
Quark Propagator and Meson Correlators in the QCD Vacuum
International Journal of Modern Physics E-nuclear Physics, 1997
Equal time, point to point correlation functions for spatially separated meson currents are calculated with respect to a variational construct for the ground state of QCD. Given such an ansatz we make no further approximations in the evaluation of the correlators. Our calculations for the vector, axial vector and scalar channels show qualitative agreement with the phenomenological predictions, whereas the pseudoscalar channel does not. However, the pseudoscalar correlator, when approximated by saturating with intermediate one pion states agrees with results obtained from spectral density functions parameterised by pion decay constant and <−barpsipsi><-\bar \psi \psi><−barpsipsi> value obtained from chiral perturbation theory. We discuss this departure in the pseudoscalar channel, in context of the quark propagation in the vacuum.
Mesonic correlation functions in the random instanton vacuum
Nuclear Physics B, 1993
A general model-independent discussion of mesonic correlation functions is given. We derive new inequalities, including one stronger than Weingarten's inequality. Mesonic correlation functions are calculated in the random instanton vacuum and are compared with phenomenological expectations and lattice results. Both diagonal and non-diagonal correlators of all strange and light flavored currents, as well as the most important unflavored ones are considered. Our results are used to extract the masses and the coupling constants of the corresponding mesons. Not only the qualitative behaviour is reproduced in all channels, but in several channels the model works with amazing accuracy up to distances of 1.5 f m.
QCD instantons at finite temperature (I). Gluonic interactions and the fermion determinant
Nuclear Physics B, 1991
This is the first in a series of papers devoted to instanton-induced effects at non-zero temperatures. The main points will be the restoration of the chiral symmetry and the modification of the various correlation functions with increasing temperature. In this paper we investigate the temperature dependence of the gluonic and the quark-induced pseudo-particle interaction. We find that the gluonic interaction becomes much more long ranged, whereas the quark-induced interaction becomes exponentially short ranged.