engleski

η′ Multiplicity and Witten-Veneziano Relation at T>0

Recent RHIC results on eta' multiplicity in heavy-ion collisions are of great importance because they clearly signal a partial restoration of U_A(1) symmetry at high temperatures T, and thus provide an unambiguous signature of the formation of a new state of matter. Prompted by these experimental results of STAR and PHENIX collaborations, we discuss and propose the minimal generalization of the Witten-Veneziano relation to finite T.

eta' meson multiplicity; heavy-ion collisions; singlet chiral symmetry restoration; hot medium

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