Muonic Hydrogen and the Third Zemach Moment

الأصل · EN

We determine the third Zemach moment of hydrogen (<r³>(2)) using only the world data on elastic electron-proton scattering. This moment dominates the O (Z alpha)⁵ hadronic correction to the Lamb shift in muonic atoms. The resulting moment, <r³ >(2) = 2.71(13) fm³, is somewhat larger than previously inferred values based on models. The contribution of that moment to the muonic hydrogen 2S level is -0.0247(12) meV.