Speaker
Prof.
ELSEN VELI VELIEV
(Department of Physics, Kocaeli University, 41380 Izmit, Turkey)
Description
We calculate the masses and leptonic decay constants of the heavy vector quarkonia, $J/\psi$ and $\Upsilon$ mesons at finite temperature. In particular, considering the thermal spectral density as well as additional operators coming up at finite temperature, the thermal QCD sum rules are acquired. Our numerical calculations demonstrate that the masses and decay constants are insensitive to the variation of temperature up to $T\cong100 MeV$, however after this point, they start to fall altering the temperature. At deconfinement temperature, the decay constants attain roughly to 45% of their vacuum values, while the masses are diminished about 12% and 2.5% for $J/\psi$ and $\Upsilon$ states, respectively. The obtained results at zero temperature are in good consistency with the existing experimental data as well as predictions of the other nonperturbative models. Considerable decreasing in the values of the decay constants can be considered as a sign of the quark gluon plasma phase transition.
Author
Prof.
ELSEN VELI VELIEV
(Department of Physics, Kocaeli University, 41380 Izmit, Turkey)
Co-authors
Mrs
ARZU TURKAN
(Department of Physics, Kocaeli University, 41380 Izmit, Turkey)
Mrs
GULSAH KAYA
(Department of Physics, Kocaeli University, 41380 Izmit, Turkey)
Dr
HAYRIYE SUNDU
(Department of Physics, Kocaeli University, 41380 Izmit, Turkey)
Dr
KAZEM AZIZI
(Physics Division, Faculty of Arts and Sciences, Doğuş University, Acıbadem-Kadıköy, 34722 Istanbul, Turkey)
