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Title: Approach to equilibrium of quarkonium in quark-gluon plasma

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Journal Article: Published Article
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 97; Journal Issue: 1; Related Information: CHORUS Timestamp: 2018-01-25 08:15:05; Journal ID: ISSN 2469-9985
American Physical Society
Country of Publication:
United States

Citation Formats

Yao, Xiaojun, and Müller, Berndt. Approach to equilibrium of quarkonium in quark-gluon plasma. United States: N. p., 2018. Web. doi:10.1103/PhysRevC.97.014908.
Yao, Xiaojun, & Müller, Berndt. Approach to equilibrium of quarkonium in quark-gluon plasma. United States. doi:10.1103/PhysRevC.97.014908.
Yao, Xiaojun, and Müller, Berndt. 2018. "Approach to equilibrium of quarkonium in quark-gluon plasma". United States. doi:10.1103/PhysRevC.97.014908.
title = {Approach to equilibrium of quarkonium in quark-gluon plasma},
author = {Yao, Xiaojun and Müller, Berndt},
abstractNote = {},
doi = {10.1103/PhysRevC.97.014908},
journal = {Physical Review C},
number = 1,
volume = 97,
place = {United States},
year = 2018,
month = 1

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevC.97.014908

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  • We study the evolution of heavy quarkonium states with temperature in a quark-gluon plasma (QGP) by evaluating the in-medium Q-Q T-matrix within a reduced Bethe-Salpeter equation in both S- and P-wave channels. The underlying interaction kernel is extracted from recent finite-temperature QCD lattice calculations of the singlet free energy of a Q-Q pair. The bound states are found to gradually move above the Q-Q threshold after which they rapidly dissolve in the hot system. The T-matrix approach is particularly suited to investigate these mechanisms as it provides a unified treatment of bound and scattering states including threshold effects and themore » transition to the (perturbative) continuum. We apply the T-matrix to calculate Q-Q spectral functions as well as pertinent Euclidean-time correlation functions which are compared to results from lattice QCD. A detailed analysis reveals large sensitivities to the interplay of bound and scattering states, to temperature-dependent threshold energies, and to the reconstructed correlator used for normalization. We furthermore investigate the impact of finite-width effects on the single-quark propagators in the QGP as estimated from recent applications of heavy-quark rescattering to RHIC data.« less
  • We report about a recent calculation of the heavy quarkonium mass and decay width in a quark-gluon plasma, whose temperature T and screening mass m{sub D} satisfy the hierarchy m{alpha}{sub s}>>T>>m{alpha}{sub s}{sup 2}>>m{sub D}, m being the heavy-quark mass, up to order m{alpha}{sub s}{sup 5}. The calculation may be relevant to understand the behavior of the {Upsilon}(1S) in a quark-gluon plasma at present-day colliders.
  • We consider the evolution of the phase transition of the quark-gluon plasma into hadrons, assuming that the phase transition proceeds by means of evaporation of hadrons from the surface of a plasma drop. It is shown that the chemical composition of the quark-gluon plasma changes during the course of the phase transition, and therefore the conditions of the phase transition also change. This affects the yields of hadrons of different kinds.
  • The response of a longitudinal expanding (boost-invariant) quark-gluon plasma in equilibrium to a weak external chromoelectric field is investigated. The oscillatory modes of such a plasma differ substantially from those of the unconstrained, uniform plasma for temperatures and times characteristic for nucleus-nucleus collisions. copyright 1988 Academic Press, Inc.
  • We calculate leading-order dilepton yields from a quark-gluon plasma that has a time-dependent anisotropy in momentum space. Such anisotropies can arise during the earliest stages of quark-gluon plasma evolution due to the rapid longitudinal expansion of the created matter. Two phenomenological models for the proper-time dependence of the parton hard momentum scale, p{sub hard}, and the plasma anisotropy parameter, {xi}, are constructed that describe the transition of the plasma from its initial nonequilibrium state to an isotropic thermalized state. The first model constructed interpolates between 1+1 dimensional free streaming at early times and 1+1 dimensional ideal hydrodynamical expansion at latemore » times. In the second model we include the effect of collisional broadening of the parton distribution functions in the early-time pre-equilibrium stage of plasma evolution. We find for both cases that for fixed initial conditions high-energy dilepton production is enhanced by pre-equilibrium emission. When the models are constrained to fixed final pion multiplicity the dependence of the resulting spectra on the assumed plasma isotropization time is reduced. Using our most realistic collisionally broadened model we find that high-transverse-momentum dilepton production would be enhanced by at most 40% at the Relativistic Heavy Ion Collider and 50% at the CERN Large Hadron Collider if one assumes an isotropization/thermalization time of 2 fm/c. Given sufficiently precise experimental data this enhancement could be used to determine the plasma isotropization time experimentally.« less