Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-06-17
Phys.Lett.B681:247-252,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages
Scientific paper
10.1016/j.physletb.2009.10.015
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.
Iancu Edmond
Mueller Alfred H.
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