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\eta' Multiplicity and the Witten-Veneziano relation at finite temperature (CROSBI ID 174403)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Benić, Sanjin ; Horvatić, Davor ; Kekez, Dalibor ; Klabučar, Dubravko \eta' Multiplicity and the Witten-Veneziano relation at finite temperature // Physical review. D, Particles, fields, gravitation, and cosmology, 84 (2011), 1; 016006-1-016006-7. doi: 10.1103/PhysRevD.84.016006

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

Povezanost rada

Fizika

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