On the new HERMES data for the electroproduction on nuclei

TL;DR

This paper examines recent HERMES data on hadron electroproduction on nuclei, using a Lund model and geometrical absorption, revealing discrepancies in A-dependence and differences between nitrogen and neon data.

Contribution

It introduces a combined model for electroproduction and absorption effects and identifies unexpected differences in data for nitrogen and neon.

Findings

The model overestimates A-dependence of absorption effects.

The model fits earlier data but not recent data.

Discrepancies are traced to differences between nitrogen and neon data.

Abstract

We analyze recent data on the electroproduction of hadrons on nuclei using the Lund model for electroproduction on nucleons and a simple geometrical model for the absorption effects. We show that the model seems to overestimate the A-dependence of the absorption effects, although it described the earlier data of the same HERMES experiment reasonably well. We trace the origin of this discrepancy to the surprising difference between the data for nitrogen and neon.