Application of the two-scale model to the HERMES data on nuclear attenuation

The two-scale model and its improved version were used to perform a fit to the HERMES data for the nu (the virtual photon energy) and z (the fraction of nu carried by hadron) dependences of the nuclear multiplicity ratios for pi(+) and pi(-) mesons electro-produced on two nuclear targets (N-14 and Kr-84). The quantitative criterion chi(2) was used for the first time to analyze the results of the model fit to the nuclear multiplicity ratios data. The two-parameter's fit gave satisfactory agreement with the HERMES data. Best values of the parameters were then used to calculate the nu and z dependences of the nuclear attenuation for pi(0), K+, K-, and (p) over bar produced on the Kr-84 target, and also make predictions for nu, z, and the Q(2) (the photon virtuality) dependences of the nuclear attenuation data for those identified hadrons and nuclei that will be published by HERMES.