Simple parameterization of nuclear attenuation data

Akopov, N.; Grigoryan, L.; Akopov, Z.

Simple parameterization of nuclear attenuation data

Authors

Akopov, N.

Grigoryan, L.

Akopov, Z.

Description

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 $z$.