Naslov
\eta' Multiplicity and the Witten-Veneziano relation at finite temperature

Autori
Benić, Sanjin ; Horvatić, Davor ; Kekez, Dalibor ; Klabučar, Dubravko

Izvornik
Physical Review D - Particles, Fields, Gravitation, and Cosmology (1550-7998) 84 (2011), 1; 016006-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
eta; eta'; Witten-Veneziano relation; finite temperature QFT

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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