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arXiv · 0902.3570

Screened potential and quarkonia properties at high temperatures

J. Vijande·G. Krein·A. Valcarce
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Abstract

We perform a quark model calculation of the quarkonia $b\overline{b}$ and $c\overline{c}$ spectra using smooth and sudden string breaking potentials. The screening parameter is scale dependent and can be related to an effective running gluon mass that has a finite infrared fixed point. A temperature dependence for the screening mass is motivated by lattice QCD simulations at finite temperature. Qualitatively different results are obtained for quarkonia properties close to a critical value of the deconfining temperature when a smooth or a sudden string breaking potential is used. In particular, with a sudden string breaking potential quarkonia radii remain almost independent of the temperature up to the critical point, only well above the critical point the radii increase significantly. Such a behavior will impact the phenomenology of quarkonia interactions in medium, in particular for scattering dissociation processes.

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J. Vijande, G. Krein, A. Valcarce. 2009-02-20. Screened potential and quarkonia properties at high temperatures. https://doi.org/10.1140/epja/i2008-10736-9

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