Berlin 2005 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 19: Theorie

HK 19.3: Talk

Monday, March 7, 2005, 15:00–15:15, TU MA005

Deep inelastic lepton nucleus scattering and hadronization — •Daniel Grünewald — Institut für theoretische Physik der Universität Heidelberg Philosophenweg 19, D-69120 Heidelberg, Germany

Semi-inclusive deep inelastic scattering on nuclei is investigated. An absorption model for possible hadron interaction inside the nucleus is derived and employed, based on flavor dependent hadron formation lengths, which are calculated in the framework of the LUND string fragmentation model. Additionally, the rescaling of parton distribution and fragmentation functions in the nuclear medium due to the hypothesis, that a quark in a bound nucleon has access to a larger region of space, are considered in the partial deconfinement model. The model predictions are compared with recent HERMES results for the multiplicity ratios normalized to deuterium on various hadron species and different nuclei. Beside the proton, a good agreement is found. Furthermore, the mass number dependence of the multiplicity ratios is predicted for both nuclear absorption and energy loss mechanism, providing a possible tool in order to disentangle them.