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Logarithmically enhanced Euler-Heisenberg Lagrangian contribution to the electron gyromagnetic factor
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abstract
Contrary to what was previously believed, two-loop radiative corrections to the $g$-factor of an electron bound in a hydrogen-like ion at $\mathcal{O}\left(\alpha^2 (Z\alpha)^5\right)$ exhibit logarithmic enhancement. This previously unknown contribution is due to a long-distance light-by-light scattering amplitude. Taking an effective field theory approach, and using the Euler-Heisenberg Lagrangian, we find $\Delta g = -\left( \frac{\alpha}{\pi} \right)^2\left(Z\alpha\right)^5 \frac{56 \pi}{135}\ln Z\alpha$.
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An effective field theory for muon conversion and muon decay-in-orbit
A five-stage EFT tower factorizes QED corrections to muon conversion and decay-in-orbit near the endpoint, yielding a resummed NLL-corrected signal shape.
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