Charmonium spectral functions in two-flavour QCD

Aarts, Gert; Allton, Chris; Morrin, Richie; Cais, Alan Ó.; Oktay, M. B.; Peardon, Mike; Skullerud, Jon-Ivar

doi:10.1016/j.nuclphysa.2006.11.065

Cited by 17 publications

(20 citation statements)

References 14 publications

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“…Given that the Euclidean correlators are determined by Monte-Carlo methods and carry statistical errors, this is a significant drawback. The difficulty is far more severe than in studies of the charmonium spectral functions [29,30,31], or calculations of the electromagnetic conductivity [32], because the spectral function only grows as ω 2 for the vector currentψγ i ψ.…”

Section: Introductionmentioning

confidence: 99%

Energy-momentum tensor correlators and spectral functions

Meyer

2008

J. High Energy Phys.

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We calculate the thermal Euclidean correlators and the spectral functions of the energymomentum tensor for pure gauge theories, including at non-zero spatial momentum, at leading order in perturbation theory. Our goal is to improve the extraction of transport properties from Euclidean correlators that are computable in lattice QCD. Based on our results and the predictions of hydrodynamics for the structure of the spectral functions at low frequencies, we show that the shear and bulk viscosities can advantageously be extracted from the Euclidean correlators of the conserved charges, energy and momentum, at small but non-vanishing spatial momentum. The spectral functions in these channels are free of the ultraviolet ω 4 term which represents a large background to the thermal physics encoded in the correlators of the fluxes.

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Section: Introductionmentioning

confidence: 99%

Energy-momentum tensor correlators and spectral functions

Meyer

2008

J. High Energy Phys.

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“…Lattice studies of charmonium SFs using the MEM have been carried out on numerous occasions ( [23,[28][29][30][31][32][33][34][35]), but so far not in 2+1 flavour QCD. A recent, detailed study of charmonium SFs in quenched QCD can be found in [34].…”

Section: The Maximum Entropy Methodsmentioning

confidence: 99%

“…Results regarding spectral functions with 2 flavours of dynamical quarks can be found in Refs. [31,35]. A recent study of electric conductivity using 2+1 flavours of anisotropic Wilson fermions can be found in [36].…”

Section: The Maximum Entropy Methodsmentioning

confidence: 99%

Charmonium spectral functions from 2+1 flavour lattice QCD

Borsányi¹,

Dürr²,

Fodor³

et al. 2015

Proceedings of the 32nd International Symposium on Lattice Field Theory — PoS(LATTICE2014)

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Finite temperature charmonium spectral functions in the pseudoscalar and vector channels are studied in lattice QCD with 2+1 flavours of dynamical Wilson quarks, on fine isotropic lattices (with a lattice spacing of 0.057fm), with a non-physical pion mass of m π ≈ 545MeV. The highest temperature studied is approximately 1.4T c . Up to this temperature no significant variation of the spectral function is seen in the pseudoscalar channel. The vector channel shows some temperature dependence, which seems to be consistent with a temperature dependent low frequency peak related to heavy quark transport, plus a temperature independent term at ω > 0. These results are in accord with previous calculations using the quenched approximation.

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“…[26], and (ii) what about the case for full QCD? [28] Also, we would like to know what will happen for the charmoniums moving inside the medium [29,30], for the lighter quark masses (such as u, d, s quarks) [31], and for the heavier quark mass (such as b) [32].…”

Section: Further Questionsmentioning

confidence: 99%

Strong correlations in hot QCD

Hatsuda¹

2006

Proceedings of XXIVth International Symposium on Lattice Field Theory — PoS(LAT2006)

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After reviewing briefly the basic strategy of analyzing the RHIC data, recent lattice results of the non-pertubative/strong-coupling aspects of quark-gluon plasma probed primarily by the heavy quarks are presented. In particular, free energies of static quarks in various color channels, the Debye screening mass and the spatial string tension above the pseudo-critical temperature are discussed on the basis of the full QCD simulations with staggered quarks and with Wilson quarks. Current status of the equal-time Bethe-Salpeter wave functions and the spectral functions of the charmoniums in quenched QCD simulations is also summarized. It is argued that the hot plasma above the (pseudo-)critical temperature T c is still strongly interacting up to T ∼ (1.5 − 2)T c so that hadronic bound states or resonances made of strange, charm and bottom quarks in certain channels may survive inside the plasma. An attempt to extract the spectral functions at finite T in full QCD simulations is also mentioned.

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Charmonium spectral functions in two-flavour QCD

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 η c ) survive up to temperatures close to 2T c , while the P-waves (χ c0 and χ c1 ) melt away below 1.3T c .

Cited by 17 publications

References 14 publications

Energy-momentum tensor correlators and spectral functions

Energy-momentum tensor correlators and spectral functions

Charmonium spectral functions from 2+1 flavour lattice QCD

Strong correlations in hot QCD

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