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arXiv 0709.2884hep-phnucl-exnucl-th
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夸克-胶子等离子体中重夸克的非微扰扩散

Nonperturbative Heavy-Quark Diffusion in the Quark-Gluon Plasma

H. van Hees, M. Mannarelli, V. Greco, R. Rapp

摘要:

利用从热格点量子色动力学中提取的相互作用势计算了夸克-胶子等离子体(QGP)中重夸克(HQ)的输运性质。在Brueckner多体方案中,我们计算了QGP中轻夸克的魅力和底夸克散射的介质中T矩阵。在~1.5 T_c温度范围内,相互作用主要由介子和双夸克吸引通道控制,它们支持束缚态和共振态。我们应用相关的阻力和扩散系数(补充微扰散射胶子)在朗之万模拟在一个膨胀的火球计算HQ光谱和椭圆流\sqrt{s_{NN}} =200 GeV的金-金碰撞。我们发现很好的协议与半轻子电子衰变谱支持我们的非微扰计算的HQ扩散系数,暗示强耦合QGP。

英文摘要:

We evaluate heavy-quark (HQ) transport properties in a Quark-Gluon Plasma (QGP) employing interaction potentials extracted from thermal lattice QCD. Within a Brueckner many-body scheme we calculate in-medium T-matrices for charm- and bottom-quark scattering off light quarks in the QGP. The interactions are dominated by attractive meson and diquark channels which support bound and resonance states up to temperatures of ~1.5 T_c. We apply pertinent drag and diffusion coefficients (supplemented by perturbative scattering off gluons) in Langevin simulations in an expanding fireball to compute HQ spectra and elliptic flow in \sqrt{s_{NN}}=200 GeV Au-Au collisions. We find good agreement with semileptonic electron-decay spectra which supports our nonperturbative computation of the HQ diffusion coefficient, suggestive for a strongly coupled QGP.

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