Light scalar K-0* (700) meson in vacuum and a hot medium

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Azizi K., Barsbay B., Sundu H.

PHYSICAL REVIEW D, vol.100, no.9, 2019 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 100 Issue: 9
  • Publication Date: 2019
  • Doi Number: 10.1103/physrevd.100.094041
  • Journal Name: PHYSICAL REVIEW D
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Kocaeli University Affiliated: Yes


The K-0* (700) meson appears as the lightest strange scalar meson in Particle Data Group (PDG). Although there were a lot of experimental and theoretical efforts to establish this particle and determine its properties and nature, it still needs confirmation in an experiment, and its internal quark-gluon organization needs to be clarified. In this connection, we study some spectroscopic properties of this state in a hot medium as well as a vacuum by modeling it as a usual meson of a quark and an antiquark. In particular, we investigate its mass and coupling or decay constant in terms of the temperature of a hot medium by including the medium effects by the fermionic and gluonic parts of the energy-momentum tensor as well as the temperature-dependent continuum threshold, quark, gluon, and mixed condensates. We observe that the mass of K-0* (700) remains unchanged up to T similar or equal to 0.6T(c) with T-c being the critical temperature, but it starts to diminish after this point and approaches zero near to the critical temperature referring to the melting of the meson. The coupling of K-0* (700) is also sensitive to T at higher temperatures. It starts to grow rapidly after T similar or equal to 0.85T(c). We turn off the medium effects and calculate the mass and coupling of the K-0* (700) state at zero temperature. The obtained mass is in accord with the average Breit-Wigner mass value reported by PDG.