Meson correlation functions in a QCD plasma

被引：19

作者：

Alberico, WM

Beraudo, A

Molinari, A

机构：

[1] Univ Turin, Dipartimento Fis Teor, I-10125 Turin, Italy

[2] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy

来源：

NUCLEAR PHYSICS A | 2005年 / 750卷 / 2-4期

关键词：

finite temperature QCD; quark gluon plasma; meson correlation function; HTL approximation; NLA approximation;

D O I：

10.1016/j.nuclphysa.2004.12.070

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

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. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：359 / 390

页数：32

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