In this talk, we present the reduction of the mass of η′-meson at finite temperature which leads to the enhancement of η′ contributions to the dilepton spectra from relativistic heavy ion collisions. QCD low energy theorem, together with the Witten-Veneziano formula, provides the relation of the η′ mass with gluon condensates.
Bibliographical noteFunding Information:
This work of YK was supported in part by the Yonsei University Research Fund of 2010. GW was supported partly by an Hungarian OTKA fund T71989.
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics