  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.
