Three-Loop Slope of the Dirac Form Factor and theLamb Shift in Hydrogen
- 21 February 2000
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 84 (8), 1673-1676
- https://doi.org/10.1103/physrevlett.84.1673
Abstract
The last unknown contribution to hydrogen energy levels at order , due to the slope of the Dirac form factor at three loops, is evaluated in a closed analytical form. The resulting shift of the hydrogen energy level is found to be . Using the QED calculations of the Lamb shift, we extract a precise value of the proton charge radius .
Other Versions
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