Abstract
The influence of the nuclear medium on the production of charged hadrons in semi-inclusive deep-inelastic scattering has been studied by the HERMES experiment at DESY using a 27.5 GeV positron beam. The differential multiplicity of charged hadrons and identified charged pions from nitrogen relative to that from deuterium has been measured as a function of the virtual photon energy $\nu$ and the fraction z of this energy transferred to the hadron. There are observed substantial reductions of the multiplicity ratio $R_M^{h}$ at low $\nu$ and at high z, both of which are well described by a gluon-bremsstrahlung model of hadronization. A significant difference of the $\nu$ -dependence of $R_M^{h}$ is found between positive and negative hadrons. This is interpreted in terms of a difference between the formation times of protons and pions, using a phenomenological model to describe the $\nu$ - and z-dependence of $R_M^{h}$ .
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