Non-perturbative parton mass for the gluon
Abstract
A gauge invariant, non-local observable is constructed in pure gauge theory, which is identical to the gluon propagator in a particular gauge, permitting to define a non-perturbative parton mass for the gluon. This mass can be shown to be related to the 1P-1S mass splitting of heavy quarkonia. Preliminary numerical results for 3d SU(2) yield mA=0.37(6)g2, while from the bb spectrum one infers mA≈ 420 MeV for QCD.
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