G. Aarts

Publications (7)7.37 Total impact

• Article: Bottomonium from lattice QCD as a probe of the Quark-Gluon Plasma

  G. Aarts, C. Allton, A. Kelly, J. -I. Skullerud, S. Kim, T. Harris, S. M. Ryan, M. P. Lombardo, M. B. Oktay, D. K. Sinclair
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  ABSTRACT: We study the temperature dependence of bottomonium for temperatures in the range 0.4 Tc < T < 2.1 Tc, using non-relativistic dynamics for the bottom quark and full relativistic lattice QCD simulations for Nf=2 light flavors. We consider the behaviour of the correlators in Euclidean space, we analyze the associated spectral functions and we study the dependence on the momentum. Our results are amenable to a successful comparison with effective field theories. They help build a coherent picture of the behaviour of bottomonium in the plasma, consistent which the current LHC results.
  12/2012;
• Source

  Available from: Jon-Ivar Skullerud

  Article: Bottomonium above deconfinement in lattice nonrelativistic QCD.

  G Aarts, S Kim, M P Lombardo, M B Oktay, S M Ryan, D K Sinclair, J-I Skullerud
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  ABSTRACT: We study the temperature dependence of bottomonium for temperatures in the range 0.4T(c) < T < 2.1T(c), using nonrelativistic dynamics for the bottom quark and full relativistic lattice QCD simulations for Nf = 2 light flavors on a highly anisotropic lattice. We find that the Υ is insensitive to the temperature in this range, while the χb propagators show a crossover from the exponential decay characterizing the hadronic phase to a power-law behavior consistent with nearly free dynamics at T ≃ 2T(c).
  Physical Review Letters 02/2011; 106(6):061602. · 7.37 Impact Factor
• Source

  Available from: Simon J. Hands

  Article: Polarised correlators at finite temperature

  G. Aarts, C. R. Allton, S. J. Hands, J. Foley, S Kim
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  ABSTRACT: QCD undergoes a deconfining transition at high temperature to a "quark-gluon plasma" phase where hadrons may become unbound. In this work, meson correlation functions at non-zero momentum are studied both in the confined and plasma phases using the Maximum Entropy Method. In particular, both the longitudinal and transverse modes of the vector correlation functions are considered. Only in the case of light quarks in the plasma phase, we find that both longitudinal and transverse spectral functions have a non-zero intercept at zero energy. Comment: Talk presented by C.R. Allton at the International Lattice Symposium Villasimius, Italy, June 2010. 7 pages
  07/2010;
• Source

  Available from: Jon-Ivar Skullerud

  Article: Charmonium properties in the quark-gluon plasma

  M. B. Oktay, M. J. Peardon, J. I. Skullerud, G. Aarts, C. R. Allton
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  ABSTRACT: We present results for charmonium correlators and spectral functions in 2-flavour CD on anisotropic lattices. Our results indicate that the S-waves (J/psi and eta_c) survive up to temperatures close to 2T_c, while the P-waves (chi_c0 and chi_c1) melt away below 1.2T_c.
  11/2007;
• Source

  Available from: Jon-Ivar Skullerud

  Article: Charmonium spectral functions in N_f=2 QCD at high temperature

  G. Aarts, C. R. Allton, R. Morrin, A. P. O Cais, M. B. Oktay, M. J. Peardon, J. I. Skullerud
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  ABSTRACT: Charmonium systems in two-flavour QCD at non-zero temperature are studied at, and above the deconfining transition. Using anisotropic lattices the MEM approach is used to extract spectral functions for these channels. By carefully varying some of the irrelevant parameters in the MEM procedure, we confirm that our systematic effects are under control. The eta_c and J/psi states are found to persist at temperatures >~ 1.3 T_c in agreement with our previous dynamical studies.
  10/2006;
• Source

  Available from: Jon-Ivar Skullerud

  Article: Charmonium spectral functions in two-flavour QCD

  G. Aarts, C.R. Allton, R. Morrin, A. Ó Cais, M.B. Oktay, M.J. Peardon, J.I. Skullerud
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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;
• Source

  Available from: Jon-Ivar Skullerud

  Article: Charmonium spectral functions in Nf=2 QCD

  R. Morrin, A. P. O Cais, M. B. Oktay, M. J. Peardon, J. I. Skullerud, G. Aarts, C. R. Allton
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  ABSTRACT: We report on a study of charmonium at high temperature in 2-flavour QCD. This is the first such study with dynamical fermions. Using an improved anisotropic lattice action, spectral functions are extracted from correlators in the vector and pseudoscalar channels. No signs of medium-induced suppression of the ground states are seen for temperatures up to 1.5T_c, while at T~2T_c there are clear signs of modifications. The current systematic and statistical uncertainties in our data, in particular the relatively coarse lattice and small volume, do not allow us to draw a firm conclusion at this stage.
  09/2005;