English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The discrepancy between the measured Lamb shift in muonic hydrogen andexpectations from electron-proton scattering and regular hydrogen spectroscopyhas become known as the proton radius puzzle, whose most "mundane" resolutionrequires a $> 5 \sigma$ shift in the value of the fundamental Rydberg constant.I briefly review the status of spectroscopic and scattering measurements,recent theoretical developments, and implications for fundamental physics.

Review of experimental and theoretical status of the proton radius puzzle