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We investigate the critical curve of the string tension sigma(T) as afunction of temperature in quenched gauge invariant SU(3) lattice gauge theory.We extract sigma(T) from the colour averaged free energy of a staticquark-antiquark pair. To compute the free energy, we utilize a pair of gaugeinvariant Polyakov loop and antiloop correlations, and apply the multihitprocedure to enhance the signal to noise ratio. We find that the string tensiondeparts from the zero temperature sigma(0) at T close to 0.5 Tc. We cover therelevant temperature range from 0.5 Tc up to the confinement temperature Tcusing 57 different sets of pure gauge lattice configurations with four temporalextensions (4,6,8,12), different beta and a spatial volume of 48^3 in latticeunits.

Lattice QCD computation of the SU(3) String Tension critical curve