On non-perturbative effects in the jet physics

We consider quark scattering off nonperturbative gluonic fields in the vacuum and its impact on the hadronic final state in the e⁺e^--annihilation. A conservative estimate gives a nonperturbative p_⊥≅1GeV. The modification of the final state survives even at an arbitrary high energy, where the corrections to the total cross-section die away. We also argue that the coupling constant extracted from the perturbative treatment of the jet phenomenology can well be different from that governing the correction to σ_tot.