Thermal behavior of Charmonium in the vector channel from QCD sum rules
- Centre for Theoretical Physics and Astrophysics, University of Cape Town, Rondebosch 7700 (South Africa)
- Facultad de Fisica, Pontificia Universidad Catolica de Chile, Casilla 306, Santiago 22 (Chile)
- Departamento de Fisica, Universidad Catolica del Norte, Casilla 1280, Antofagasta (Chile)
The thermal evolution of the hadronic parameters of charmonium in the vector channel, i.e. the J/{Psi} resonance mass, coupling (leptonic decay constant), total width, and continuum threshold are analyzed in the framework of thermal Hilbert moment QCD sum rules. The continuum threshold s{sub 0} has the same behavior as in all other hadronic channels, i.e. it decreases with increasing temperature until the PQCD threshold s{sub 0} = 4m{sub Q}{sup 2} is reached at T{approx_equal}1.22T{sub c}(m{sub Q} is the charm quark mass). The other hadronic parameters behave in a very different way from those of light-light and heavy-light quark systems. The J/{Psi} mass is essentially constant in a wide range of temperatures, while the total width grows with temperature up to T{approx_equal}1.04T{sub c} beyond which it decreases sharply with increasing T. The resonance coupling is also initially constant beginning to increase monotonically around T{approx_equal}T{sub c}. This behavior of the total width and of the leptonic decay constant is a strong indication that the J/{Psi} resonance might survive beyond the critical temperature for deconfinement, in agreement with some recent lattice QCD results.
- OSTI ID:
- 21506744
- Journal Information:
- AIP Conference Proceedings, Vol. 1296, Issue 1; Conference: 11. hadron physics international workshop, Maresias, Sao Paulo (Brazil), 21-26 Mar 2010; Other Information: DOI: 10.1063/1.3523159; (c) 2010 American Institute of Physics; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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