Nuclear medium effects on hadronization measured by the HERMES Collaboration

Aula Leale edif. 22 (Laboratori Nazionali di Frascati, Via E. Fermi 40, Frascati)

Aula Leale edif. 22

Laboratori Nazionali di Frascati, Via E. Fermi 40, Frascati

The influence of cold nuclear medium effects on hadron multiplicities in semi-inclusive deep inelastic scattering was studied extensively and is presented together with the first direct measurement of $p_t$-broadening effects in cold nuclear matter as a function of several kinematic variables for different hadron types. The data have been accumulated by the {\scHermes} experiment at {\sc Desy}, in which the {\sc Hera} 27.6~GeV lepton beam scattered off several nuclear gas targets. These analysis provide precious information concerning the space-time evolution of hadronization.
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