Thermal properties of the exotic X(3872) state via QCD sum rule


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Veliev E. , GÜNAYDIN S., Sundu H.

EUROPEAN PHYSICAL JOURNAL PLUS, vol.133, no.4, 2018 (Journal Indexed in SCI) identifier identifier

Abstract

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.