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Charmonium spectrum at finite temperature from a Bayesian analysis of QCD sum rules

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Author(s): Gubler Philipp | Morita Kenji | Oka Makoto

Journal: EPJ Web of Conferences
ISSN 2100-014X

Volume: 20;
Start page: 03001;
Date: 2012;
Original page

ABSTRACT
Making use of a recently developed method of analyzing QCD sum rules, we investigate charmonium spectral functions at finite temperature. This method employs the Maximum Entropy Method, which makes it possible to directly obtain the spectral function from the sum rules, without having to introduce any strong assumption about its functional form. Finite temperature effects are incorporated into the sum rules by the change of the various gluonic condensates that appear in the operator product expansion. These changes depend on the energy density and pressure at finite temperature, which are extracted from lattice QCD. As a result, J/ψ and ηc dissolve into the continuum already at temperatures around 1.0 ~ 1.1 Tc.

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