Volume 317 - The 9th International workshop on Chiral Dynamics (CD2018) - Session: Hadron Structure
The proton radius: are we still puzzled?
E. Downie*  on behalf of the MUSE Collaboration
Full text: pdf
Published on: February 28, 2020
Abstract
The proton radius puzzle began in 2010 when the CREMA Collaboration released their measurement of the proton radius from muonic hydrogen spectroscopy: $r_{p}=0.84184(67)$ fm, This was five standard deviations smaller that the accepted CODATA value of that time (0.8768(69) fm), and sparked an enduring and intriguing puzzle.

Since that first measurement, many theories have been formed as to why the proton radius appears smaller when measured with muons than it does when measured with electrons. Many new measurements have also been made in an attempt to resolve the puzzle. We will detail the current status of the proton radius puzzle, and review future experimental plans, with a focus on the MUon proton Scattering Experiment (MUSE).
DOI: https://doi.org/10.22323/1.317.0024
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