New Spin Structure Constraints on Hyperfine Splitting and Proton Size
Nuclear Experiment
2024-09-04 v2 Nuclear Theory
Atomic Physics
Abstract
The 1S hyperfine splitting in hydrogen is measured to an impressive ppt precision and will soon be measured to ppm precision in muonic hydrogen. The latter measurement will rely on theoretical predictions, which are limited by knowledge of the proton polarizability effect . Data-driven evaluations of have long been in significant tension with baryon chiral perturbation theory. Here we present improved results for driven by new spin structure data, reducing the long-standing tension between theory and experiment and halving the dominating uncertainty in hyperfine splitting calculations.
Cite
@article{arxiv.2406.18738,
title = {New Spin Structure Constraints on Hyperfine Splitting and Proton Size},
author = {David Ruth and Karl Slifer and Jian-Ping Chen and Carl E. Carlson and Franziska Hagelstein and Vladimir Pascalutsa and Alexandre Deur and Sebastian Kuhn and Marco Ripani and Xiaochao Zheng and Ryan Zielinski and Chao Gu},
journal= {arXiv preprint arXiv:2406.18738},
year = {2024}
}