The proton radius: From a puzzle to precision

TL;DR

This paper reviews the history and current status of measuring the proton charge radius, highlighting the transition from a longstanding puzzle to achieving precision in its determination.

Contribution

It provides a comprehensive overview of the developments and challenges in accurately measuring the proton charge radius.

Findings

Recent measurements have refined the proton radius value.

Discrepancies between different measurement methods are discussed.

Progress has moved from controversy to precision in proton radius determinations.

Abstract

We comment on the status and history of the proton charge radius determinations.