Comment on ``Parton distributions, d/u, and higher twist effects at high x''

TL;DR

This paper critiques a recent method for extracting the neutron structure function at high x, highlighting its theoretical biases and limitations when applied to light nuclei like deuterons.

Contribution

It clarifies the issues with extrapolating nuclear EMC ratios to light nuclei, emphasizing the potential biases in neutron structure function extraction.

Findings

The approach is ill-defined for light nuclei.

It introduces significant theoretical bias.

The method's validity at high x is questionable.

Abstract

In a recent paper Yang and Bodek extracted the free neutron structure function at large x by extrapolating the density dependence of the nuclear EMC ratios to the deuteron. We clarify why this approach is ill-defined for light nuclei, and introduces a large theoretical bias into the extraction of F_2n at large x.