Lattice QCD Calculation of the Two-Photon Exchange Contribution to the Muonic-Hydrogen Lamb Shift

Autor:	Yang Fu, Xu Feng, Lu-Chang Jin, Chen-Fei Lu
Jazyk:	angličtina
Rok vydání:	2022
Předmět:	Nuclear Theory (nucl-th) High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) High Energy Physics - Lattice Nuclear Theory High Energy Physics - Lattice (hep-lat) FOS: Physical sciences General Physics and Astronomy
Zdroj:	Physical Review Letters
Popis:	We develop a method for lattice QCD calculation of the two-photon exchange contribution to the muonic-hydrogen Lamb shift. To demonstrate its feasibility, we present the first lattice calculation with a gauge ensemble at $m_\pi = 142$ MeV. By adopting the infinite-volume reconstruction method along with an optimized subtraction scheme, we obtain $\Delta E_{\text{TPE}} = -28.9(4.9)~\mu\text{eV} + 93.72~\mu\text{eV}/\text{fm}^2 \cdot\langle r_p^2 \rangle$, or $\Delta E_{\text{TPE}} = 37.4(4.9)~\mu$eV, which is consistent with the previous theoretical results in a range of 20-50 $\mu$eV. Comment: 7 pages + 3 pages supplemental material, 12 figures
Databáze:	OpenAIRE
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