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arXiv 1607.04049hep-lathep-phnucl-th
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从格点量子色动力学研究胶子介质中的复重夸克势和德拜质量

Complex heavy-quark potential and Debye mass in a gluonic medium from lattice QCD

Yannis Burnier, Alexander Rothkopf

摘要:

我们改进和扩展我们的研究复杂的介质中重夸克势和它的德拜质量$m_D$在胶子介质的更精细的扫描周围的解除禁闭过渡和新产生的合奏更接近热力学极限。在具有较大物理体积的晶格上,Re[V]显示出屏蔽的迹象,即有限的$m_D$,仅在去精细相中,使人想起真正的相变。一致性Im[V]也仅在$T_C$以上表现出非零值。我们将Re[V]的行为与历史上用于提取德拜质量的色单重自由能进行比较。计算有效耦合常数以评估在$T>0$的势的限制部分的残余影响。我们先前发现的Re[V]在更精细的晶格上逐渐屏蔽$T_C$的发现被严格地重新评估并解释为源于影响部署的$β=7$的有限体积伪影,$ξ_b=3.5$参数设置在$N_s=32$。

英文摘要:

We improve and extend our study of the complex in-medium heavy quark potential and its Debye mass $m_D$ in a gluonic medium with a finer scan around the deconfinement transition and newly generated ensembles closer to the thermodynamic limit. On the lattices with larger physical volume, Re[V] shows signs of screening, i.e. a finite $m_D$, only in the deconfined phase, reminiscent of a genuine phase transition. Consistently Im[V] exhibits nonzero values also only above $T_C$. We compare the behavior of Re[V] with the color singlet free-energies that have been used historically to extract the Debye mass. An effective coupling constant is computed to assess the residual influence of the confining part of the potential at $T>0$. Our previous finding of a gradual screening of Re[V] around $T_C$ on finer lattices is critically reassessed and interpreted to originate from finite volume artifacts that affect the deployed $β=7$, $ξ_b=3.5$ parameter set at $N_s=32$.

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