Simple parameterization of nuclear attenuation data

Abstract

Based on the nuclear attenuation data obtained by the HERMES experiment on nitrogen and krypton nuclei, it is shown that the nuclear attenuation $R_M^{h}$ can be parametrised in a form of a linear polynomial $P_1=a_{11}$ + $τa_{12}$, where $τ$ is the formation time, which depends on the energy of the virtual photon $ν$ and fraction of that energy $z$ carried by the final hadron. Three widely known parameterizations for $τ$ were used for the performed fit. The fit parameters $a_{11}$ and $a_{12}$ do not depend on $ν$ and $z$.