An ${\alpha }^2(Z\alpha {)}^{5}m$ Contribution to the Hydrogen Lamb Shift from Virtual Light by Light Scattering

Michael I. Eides, Howard Grotch, Peter Pebler

The radiative correction to the Lamb shift of order ${\alpha }^2(Z\alpha {)}^{5}m$ induced by the light by light scattering insertion in external photons is obtained. The new contribution turns ou…