The thermal properties of pseudoscalar heavy quarkonium

Abstract

Study of heavy quarkonia is one of the most interesting fields and plays an important role in understanding the properties of QCD vacuum as well as nonperturbative behavior of strong interaction. In this study we investigated the temperature dependence of leptonic decay constants for pseudoscalar heavy quarkonium states. We took into account the additional operators in the Wilson expansion at finite temperature and calculated thermal spectral density in the QCD side. The analysis of obtained thermal QCD sum rules shows that at critical temperature the decay constant decreases approximately 50% for ?c and 57% for ?b and this situation can be seen of a sign of QGP phase transition. The results at zero temperature are in a good consistency with the existing experimental values as well as predictions of the other nonperturbative approaches. © Copyright owned by the author(s).