https://doi.org/10.1140/epjp/i2018-11977-0
Regular Article
Thermal properties of the exotic X(3872) state via QCD sum rule
1
Department of Physics, Kocaeli University, 41380, Izmit, Turkey
2
Education Faculty, Kocaeli University, 41380, Izmit, Turkey
* e-mail: hayriye.sundu@kocaeli.edu.tr
Received:
17
November
2017
Accepted:
9
March
2018
Published online:
10
April
2018
In this work we investigate the X(3872) meson with quantum numbers 
in the framework of the thermal QCD sum rules method. We use a diquark-antidiquark current with the corresponding quantum numbers and calculate the two-point correlation function including contributions of non-perturbative condensates up to six dimensions. Analysis of the obtained thermal sum rule allows us to study contributions of a medium to the mass and coupling constant of the X(3872) resonance. Our numerical calculations demonstrate that the mass and the meson-current coupling constant are insensitive to the variation of temperature up to 
MeV; however, after this point, they start to fall by increasing the temperature. At deconfinement temperature, the meson-current coupling constants attain roughly to 34% of the vacuum value.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2018
