Gauge-independent approach to hard processes in QCD

Property of recombination in polarized hadronic targets

“…For this recall that the recombination calculation is done in the probabilistic limit of the QCD equations which is the same limit as for the Altarelli-Parisi equations. In this limit Gribov [7] has shown that the results are gauge independent and can be obtained, in fact, by using only the two physical transverse polarizations of the gluons. With some consideration one can be convinced that the transverse components of the light-cone axial gauge polarization vectors retain the same physical information as the physical transverse vectors of Gribov.…”