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

N. Akopov; L. Grigoryan; Z. Akopov

doi:10.1140/epjc/s2005-02366-x

EPJ

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2023 Impact factor 4.2

Particles and Fields

Eur. Phys. J. C (2005) 44: 219-226
https://doi.org/10.1140/epjc/s2005-02366-x

Theoretical Physics

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

N. Akopov^*, L. Grigoryan and Z. Akopov

Yerevan Physics Institute, Br. Alikhanian 2, 375036, Yerevan, Armenia

^* e-mail: akopoff@mail.desy.de

Abstract

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 (¹⁴N and ⁸⁴Kr). 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 $\bar{p}$ produced on the ⁸⁴Kr 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.