PoS - Proceedings of Science
Volume 396 - The 38th International Symposium on Lattice Field Theory (LATTICE2021) - Oral presentation
Lattice QCD calculation of the two-photon exchange contribution to the muonic-hydrogen Lamb shift
Y. Fu
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Pre-published on: May 16, 2022
Published on:
Abstract
We develop a method for lattice QCD calculation of the two-photon exchange (TPE) contribution to the muonic-hydrogen Lamb shift. To demonstrate the feasibility of this method, we also present an exploratory study with a gauge ensemble at $m_\pi = 142$ MeV. By adopting the infinite-volume reconstruction (IVR) method along with an optimized subtraction scheme, we obtain a preliminary result of the TPE contribution which agrees well with previous calculation using other methods and one magnitude smaller compare to the large $\sim300~\mu$eV discrepancy for the proton radius puzzle.
DOI: https://doi.org/10.22323/1.396.0607
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