New Precise Measurement of the Hyperfine Splitting of Positronium

First millimeter-wave spectroscopy of ground-state positronium

(2015) A. Miyazaki et al.   Progress of Theoretical and Experimental Physics

Positronium hyperfine splitting at ordermα7: Light-by-light scattering in the two-photon-exchange channel

(2014) Gregory S. Adkins et al.   PHYSICAL REVIEW A

Positronium energy levels at ordermα7: Light-by-light scattering in the two-photon-annihilation channel

(2014) Gregory S. Adkins et al.   PHYSICAL REVIEW A

Hyperfine Splitting in Positronium toO(α7me): One Photon Annihilation Contribution

(2014) M. Baker et al.   PHYSICAL REVIEW LETTERS

New precision measurement of hyperfine splitting of positronium

(2014) A. Ishida et al.   PHYSICS LETTERS B

Positronium Hyperfine Interval Measured via Saturated Absorption Spectroscopy

(2012) D. B. Cassidy et al.   PHYSICAL REVIEW LETTERS

Measurement of positronium hyperfine splitting with quantum oscillation

(2011) Y. Sasaki et al.   PHYSICS LETTERS B

First test of O(α2) correction of the orthopositronium decay rate

(2008) Y. Kataoka et al.   PHYSICS LETTERS B