A description of jet structure by psub(T)-limited phase space

It is shown that the distribution of momenta of particles in quark jets from electron-positron annihilation and deep inelastic lepton scattering, at energies up to about 14 GeV, can be described by a simple psub(T)-limited phase space model. This model than allows a simple, essentially kinematical, explanation of various experimental results, in particular the observed rise in or with increasing energy at lower energies, departures from scaling in momentum distributions of charged particles in e+e- annihilation and seagull dips in or at xsub(F) = 0. (orig.)