The gluon mass gap, defined as the complex pole of the gluon propagator, is linearly tied to the deconfinement temperature, and both Tc and fπ are insensitive to deep-infrared deformations below the infrared inflection point.
On the zero crossing of the three-gluon vertex
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abstract
We report on new results on the infrared behaviour of the three-gluon vertex in quenched Quantum Chormodynamics, obtained from large-volume lattice simulations. The main focus of our study is the appearance of the characteristic infrared feature known as 'zero crossing', the origin of which is intimately connected with the nonperturbative masslessness of the Faddeev-Popov ghost. The appearance of this effect is clearly visible in one of the two kinematic configurations analyzed, and its theoretical origin is discussed in the framework of Schwinger-Dyson equations. The effective coupling in the momentum subtraction scheme that corresponds to the three-gluon vertex is constructed, revealing the vanishing of the effective interaction at the exact location of the zero crossing.
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Physics of the gluon mass gap
The gluon mass gap, defined as the complex pole of the gluon propagator, is linearly tied to the deconfinement temperature, and both Tc and fπ are insensitive to deep-infrared deformations below the infrared inflection point.