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Chiral symmetry and dileptons in heavy ion collisions

Authors:	F Karsch K Redlich L Turko

Institution:	1. Institute of Physics, University of Trondheim, AVH, N-7055, Dragvoll, Norway

Abstract:	The cross section in terms of three independent radiative gluon correction form factors related to angular dependence and angular asymmetry is calculated as functions of the maximum recorded scaled gluon momentumX _g, with 0X _g1. The effects of longitudinal and transversal polarization of the initial electron and positron are taken into account. For the same geometry the two independent thrust form factors are obtained as functions of the minimum thrustT _m recorded, with 2/3T _m<1. similarly=" the=" related=" invariant=" mass=" form=" factors=" are=" obtained.=" in=" particular,=" the=" regions=" of=" infrared="> $X_g<< {{m^2 } \mathord{\left/ {\vphantom {{m^2 } s}} \right. \kern-\nulldelimiterspace} s}$ , and of near infrared gluons, ${{m^2 } \mathord{\left/ {\vphantom {{m^2 } s}} \right. \kern-\nulldelimiterspace} s}<< X_g<< {m \mathord{\left/ {\vphantom {m {\sqrt s }}} \right. \kern-\nulldelimiterspace} {\sqrt s }}$ , are discussed.

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