The DIELECTRIC FUNCTION EXCITED BY ΡNN TENSOR COUPLING IN NUCLEAR MATTER

Abstract

The dielectric function of nuclear matter excited by ρN N tensor coupling has been studied in the framework of Finite temperature field theory. The induced current mechanism has been introduced to explain the three extrema on the dielectric function curve, of which one is in the space-like region and the other two are in the time-like region. It points out that the tensor coupling contributes much more large amplitude than the vector coupling and plays a more important role on the time-like region compared with its effect on the space-like region.PACS number(s): 21.65.+f,11.10.Wx,13.75.Cs Keywords: Nuclear matter; Finite temperature field thoery; Nucleonnucleon interactionThe medium effects of the nuclear matter at finite temperature and/or density, such as the dispersion relation, the dielectric function (namely ε), the permeability and the nuclear effective mass, are very important facing the high energy physics today and excited a lot of investigations [1][2][3][4][5][6][7][8]. Among these, the dielectric property of strongly interacting matter (nuclear and quark matter) is a significant one, for it dominates the differences between the field in vacuum and in medium. Therefore all the medium effects in terms of the field in medium may be given by it in principle. For example, both the imaginary and real parts of ε are firmly related some energy loss phenomenon such as jet quenching in nuclear reaction [9,10].In relativistic heavy ion collisions, light vector mesons have achieved particular attention. This is because they can decay into dilepton pairs hence 1

Calculation of Dielectric Function of a Quark-Gluon Plasma

“…This fact enlightens people to introduce the concept of the dielectric function which is analogous to that of the electromagnetic medium to describe the inmedium properties of the vector fields. For example, in hadronic matter, the dielectric function excited by vector mesons, such as ω meson [5,10,11] and ρ meson, [12,13] has been studied extensively in the last few years. In addition, in QGP, the dielectric function excited by gluon has already been calculated with naive perturbation theory in the HTL approximation.…”