Charmonium states in quark-gluon plasma

Pramana

Kenji Morita¹  Su Houng Lee1¹ 

[1] Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749, Korea$$

关键词: Quarkonium;    quark-gluon plasma.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

We discuss how the spectral changes of quarkonia at 𝑇c can reflect the `critical' behaviour of QCD phase transition. Starting from the temperature dependencies of the energy density and pressure from lattice QCD calculation, we extract the temperature dependencies of the scalar and spin-2 gluon condensates near 𝑇c . We also parametrize these changes into the electric and magnetic condensate near 𝑇c. While the magnetic condensate hardly changes across 𝑇c, we find that the electric condensate increases abruptly above 𝑇c. Similar abrupt change is also seen in the scalar condensate. Using the QCD second-order Stark effect and QCD sum rules, we show that these sudden changes induce equally abrupt changes in the mass and width of 𝐽/𝜓, both of which are larger than 100 MeV at slightly above 𝑇c.

【 授权许可】

Unknown