27 research outputs found
Thermal behaviors of light unflavored tensor mesons in the framework of QCD sum rule
In this study, we investigate the sensitivity of the masses and decay
constants of the light and tensor mesons to the
temperature using QCD sum rule approach. In our calculations, we take into
account the additional operators appearing in operator product expansion at
finite temperature. It is obtained that at deconfinement temperature the decay
constants and masses decrease with amount of and compared to their
vacuum values, respectively. Our results on the masses at zero temperature are
consistent with the vacuum sum rules predictions as well as the experimental
data.Comment: 4 Pages and 1 Table, Prepared for the proceeding of the 4th
International Conference on Hadron Physics (TROIA'14
Thermal QCD Sum Rules Study of Vector Charmonium and Bottomonium States
We calculate the masses and leptonic decay constants of the heavy vector
quarkonia, and 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 , 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 and 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.Comment: 14 Pages, 8 Figures and 2 Table