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Above the pseudocritical temperature T_c of chiral symmetry restoration achiral spin symmetry (a symmetry of the color charge and of electricconfinement) emerges in QCD. This implies that QCD is in a confining mode andthere are no free quarks. At the same time correlators of operators constrainedby a conserved current behave as if quarks were free. This explains observedfluctuations of conserved charges and the absence of the rho-like structuresseen via dileptons. An independent evidence that one is in a confining mode isvery welcome. Here we suggest a new tool how to distinguish free quarks from aconfining mode. If we put the system into a finite box, then if the quarks arefree one necessarily obtains a remarkable diffractive pattern in the propagatorof a conserved current. This pattern is clearly seen in a lattice calculationin a finite box and it vanishes in the infinite volume limit as well as in thecontinuum. In contrast, the full QCD calculations in a finite box show theabsence of the diffractive pattern implying that the quarks are confined.

A finite box as a tool to distinguish free quarks from confinement at high temperatures