Physicists think they've resolved the proton size puzzle

""We believe this is the final nail in the coffin of the proton radius puzzle," Lothar Maisenbacher stated, emphasizing the significance of the latest experimental measurements."

"The discrepancy in proton radius measurements hinted at exciting new physics, but recent findings lean towards a smaller radius, aligning with established theoretical models."

"Quantum mechanics provides a more accurate description of atomic structure, where electrons exist in a superposition of states rather than fixed orbits."

For 15 years, physicists debated conflicting measurements of the proton's charge radius in hydrogen atoms. Recent experimental results indicate a smaller proton radius, aligning with theoretical models and diminishing the likelihood of new physics. The findings were published in Nature and Physical Review Letters. The proton, composed of three quarks, exhibits a fuzzy nature, complicating the definition of its radius. The latest evidence suggests a resolution to the proton radius puzzle, with implications for our understanding of atomic structure.

Read at Ars Technica