Meson correlation functions in a QCD plasma

Abstract

The temporal pseudoscalar meson correlation function in a QCD plasma is investigated in a range of temperatures exceeding $T_c$ and yet of experimental interest. Only the flavour-singlet channel is considered and the imaginary time formalism is employed for the finite temperature calculations. The behaviour of the meson spectral function and of the temporal correlator is first studied in the HTL approximation, where one replaces the free thermal quark propagators with the HTL resummed ones. This procedure satisfactory describes the soft fermionic modes, but its application to the propagation of hard quarks is not reliable. An improved version of the so-called NLA scheme, which allows a better treatment of the hard fermionic modes, is then proposed. The impact of the improved NLA on the pseudoscalar temporal correlator is investigated.

35 pages, 15 figures

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• T-Matrix Approach to Quarkonium Correlation Functions in the QGP
• Quarkonia in the deconfined phase: effective potentials and lattice correlators
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• Effect of anomalous magnetic moment of quarks on the phase structure and mesonic properties in the NJL model
• Vector meson spectral function and dilepton production rate in a hot and dense medium within an effective QCD approach
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• Finite momentum meson correlation functions in a QCD plasma
• Hard Thermal Loop -- theory and applications
• QCD mesonic screening masses using Gribov quantization
• HTL approach to the viscosity of quark plasma
• Screening Masses of Scalar and Pseudo-scalar Excitations in Quark-gluon Plasma
• Quark Spectrum near Chiral Transition Points
• Pseudoscalar Meson Temporal Correlation Function in HTL approach
• Some Applications of Thermal Field Theory to Quark-Gluon Plasma