\eta' Multiplicity and the Witten-Veneziano relation at finite temperature (CROSBI ID 174403)
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Podaci o odgovornosti
Benić, Sanjin ; Horvatić, Davor ; Kekez, Dalibor ; Klabučar, Dubravko
engleski
\eta' Multiplicity and the Witten-Veneziano relation at finite temperature
We discuss and propose the minimal generalization of the Witten-Veneziano relation to finite temperatures, prompted by STAR and PHENIX experimental results on the multiplicity of η′ mesons. After explaining why these results show that the zero-temperature Witten-Veneziano relation cannot be straightforwardly extended to temperatures T too close to the chiral restoration temperature TCh and beyond, we find the quantity which should replace, at T>0, the Yang-Mills topological susceptibility appearing in the T=0 Witten-Veneziano relation, in order to avoid the conflict with experiment at T>0. This is illustrated through concrete T-dependences of pseudoscalar meson masses in a chirally well- behaved, Dyson-Schwinger approach, but our results and conclusions are of a more general nature and, essentially, model-independent.
eta; eta'; Witten-Veneziano relation; finite temperature QFT
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Podaci o izdanju
84 (1)
2011.
016006-1-016006-7
objavljeno
1550-7998
10.1103/PhysRevD.84.016006