Abstract
The influence of the cold nuclear medium effects on hadron multiplicities in semiinclusive deepinelastic scattering was studied extensively. A series of measurements on deuterium, helium, neon, krypton and xenon target has been performed in order to study hadronization. Hadron multiplicities on nucleus A relative to those on deuteron are presented for various hadrons together with the first direct measurement of pt-broadening effects in lepto production. The data have been accumulated by the Hermes experiment at the Desy laboratory using a 27.6 GeV positron or electron beam. These analysis provide precious information concerning the spacetime evolution of hadronization.
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