title: O(alpha(3) lnalpha) corrections to muonium and positronium hyperfine splitting.
abstract: We compute O(alpha(3)lnalpha) relative corrections to the ground-state hyperfine splitting of a QED two-body bound state with different masses of constituents. The general result is then applied to muonium and positronium. In particular, a new value of the muon-to-electron mass ratio is derived from the muonium ground-state hyperfine splitting.
authors: Stanford Linear Accelerator Center, Stanford University, California 94309, USA. melnikov@slac.stanford.edu
authors: K
authors: K
authors: Melnikov
authors: A
authors: A
authors: Yelkhovsky