Screened potential and quarkonia properties at high temperatures

Abstract

Abstract. We perform a quark model calculation of the quarkonia bb and cc 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.PACS. 14.40.Lb Charmed mesons -12.39.Jh Nonrelativistic quark model -25.75.Nq Quark deconfinement -24.85.+p Quarks, gluons, and QCD in nuclear reactions -13.75.-n Low-energy hadron-hadron interactions

Study of the $\bar{D}$NInteraction in a QCD Coulomb Gauge Quark Model

“…[3]. For a recent discussion on the influence of hadron sizes on the quark-interchange mechanism, see Ref [17].…”

Charmonium and D mesons in hadronic matter

“…Here we present results of a recent study [3] of cc bound state properties as calculated with smooth and sudden string breaking potentials -Ref. [3] calculated also bb properties.…”

“…[3] calculated also bb properties. Qualitatively different results are obtained when using smooth or sudden stringbreaking potentials.…”

“…A large set of results for masses, radii and wave functions at the origin for ground states and excited states are presented in Ref. [3], for both charmonium (cc) and bottomonium (bb). Here we show results only for the r.m.s.…”

“…In the next Section we use a potential model to present results of a study [3] that compares the phenomenology of charmonium spectroscopy at finite temperature using smooth and sudden string breaking potentials. In the following Section, we present results of an ongoing study [4] of the possibility that J/Ψ is bound in a large nucleus through the excitation of a color singlet intermediate states of D and D * mesons with density dependent masses.…”