arXiv 0906.31752009-06-17hep-phhep-lathep-thnucl-th

有限温度下QCD强耦合行为的格点检验

A lattice test of strong coupling behaviour in QCD at finite temperature

E. Iancu, A. H. Mueller

备注：: 16 pages
发表信息：: Phys.Lett.B681:247-252,2009
DOI：: 10.1016/j.physletb.2009.10.015

摘要：

我们提出了一套晶格测量，可以测试是否deconfined，夸克-胶子等离子体，QCD相显示强耦合方面的温度几倍的临界温度的deconfinement，在该地区的共形异常变得不重要。测量是指twist-two运营商，不受对称性的保护，在强耦合的情况下，将开发大，负，异常的尺寸，导致在连续极限的各自的晶格期望值的强烈抑制。特别强调的是各自的运营商与最低的自旋（自旋2运营商正交的能量动量张量在重整化流）和淬火QCD的情况下，在那里该运营商是已知的任意值的耦合：这是夸克能量动量张量。所提出的晶格测量也可以测试等离子体成分是否是点状的（如弱耦合时所预期的那样）。

英文摘要：

We propose a set of lattice measurements which could test whether the deconfined, quark-gluon plasma, phase of QCD shows strong coupling aspects at temperatures a few times the critical temperature for deconfinement, in the region where the conformal anomaly becomes unimportant. The measurements refer to twist-two operators which are not protected by symmetries and which in a strong-coupling scenario would develop large, negative, anomalous dimensions, resulting in a strong suppression of the respective lattice expectation values in the continuum limit. Special emphasis is put on the respective operator with lowest spin (the spin-2 operator orthogonal to the energy-momentum tensor within the renormalization flow) and on the case of quenched QCD, where this operator is known for arbitrary values of the coupling: this is the quark energy-momentum tensor. The proposed lattice measurements could also test whether the plasma constituents are pointlike (as expected at weak coupling), or not.

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摘要：

英文摘要：

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