Mesons at high temperature in Nf=2 QCD

School of Mathematics, Trinity College, Dublin 2, Ireland
Nuclear Physics B - Proceedings Supplements (Impact Factor: 0.88). 11/2005; DOI: 10.1016/j.nuclphysbps.2006.01.033
Source: arXiv

ABSTRACT We report first results for spectral functions of charmonium in 2-flavour
QCD. The spectral functions are determined from vector and pseudoscalar
correlators on a dynamical, anisotropic lattice. J/psi and eta_c are found to
survive well into the deconfined phase before melting away at T<~2T_c. Current
systematic uncertainties prevent us from drawing any definite conclusions at
this stage.

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    ABSTRACT: We compute charmonium spectral functions in 2-flavour QCD using the maximum entropy method and anisotropic lattices. We find that the S-waves (J/ψ and ηc) survive up to temperatures close to 2Tc, while the P-waves (χc0 and χc1) melt away below 1.3Tc.
    Nuclear Physics A 09/2006; · 2.50 Impact Factor
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    ABSTRACT: In this talk I summarize our current understanding of quarkonium states above deconfinement based on phenomenological and lattice QCD studies.
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    ABSTRACT: We extract the $Q$-$\bar Q$ potential by using the thermodynamic quantities obtained in lattice gauge calculations. The potential is tested and found to give dissociation temperatures that agree well with those from lattice gauge spectral function analysis. Using such a $Q$-$\bar Q$ potential, we examine the quarkonium states in a quark-gluon plasma and determine the `quark drip lines' which separate the region of bound color-singlet $Q\bar Q$ states from the unbound region. The characteristics of the quark drip lines severely limit the region of possible bound $Q\bar Q$ states with light quarks to temperatures close to the phase transition temperature. Bound quarkonia with light quarks may exist very near the phase transition temperature if their effective quark mass is of the order of 300-400 MeV and higher.
    Physical Review C 07/2006; · 3.88 Impact Factor

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