2007/07/19 by C. A. Dominguez, M. Loewe, J. C. Rojas · 1 citation
Physics and Astronomy · #hep-ph
paper · pdf · doi:10.1088/1126-6708/2007/08/040
published as JHEP0708:040,2007
arxiv created 2007/07/19 · arxiv updated 2009/12/01
The temperature dependence of the mass, leptonic decay constant, and width of heavy-light quark peseudoscalar and vector mesons is obtained in the framework of thermal Hilbert moment QCD sum rules. The leptonic decay constants of both pseudoscalar and vector mesons decrease with increasing T, and vanish at a critical temperature Tc, while the mesons develop a width which increases dramatically and diverges at Tc, where Tc is the temperature for chiral-symmetry restoration. These results indicate the disappearance of hadrons from the spectral function, which then becomes a smooth function of the energy. This is interpreted as a signal for deconfinement at T=Tc. In contrast, the masses show little dependence on the temperature, except very close to Tc, where the pseudoscalar meson mass increases slightly by 10-20 %, and the vector meson mass decreases by some 20-30 %