Abstract

It is shown that in massless QED the cross section of longitudinal photon scattering and its emission probability in a+e−annihilation is nonvanishing in the limit p2 → O, where p is the photon momentum. The problem of how this phenomenon can be reconciled with the absence of longitudinal photons in the spectrum of physical states is discussed. An analogous situation takes place in QCD, where the account of longitudinal gluon distribution in hadrons is useful in some cases. Experimental consequences of this effect are predicted. The connection of the “revival” of longitudinal gluons with infrared instability in QCD is considered.

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