# High-precision measurement of the proton's atomic mass

## TL;DR

This paper presents a highly precise measurement of the proton's atomic mass using a specialized Penning-trap, significantly improving accuracy and challenging existing literature values.

## Contribution

It introduces a novel high-precision measurement method that refines the proton's atomic mass and questions previous accepted values.

## Key findings

- Proton's atomic mass measured with 32 parts-per-trillion precision
- Results differ from CODATA value by about 3 standard deviations
- Measurement technique enhances accuracy of fundamental constants

## Abstract

We report on the precise measurement of the atomic mass of a single proton with a purpose-built Penning-trap system. With a precision of 32 parts-per-trillion our result not only improves on the current CODATA literature value by a factor of three, but also disagrees with it at a level of about 3 standard deviations.