The First Cold Antihydrogen
  Antihydrogen, the atomic bound state of an antiproton and a positron, was produced at low energy for the first time by the ATHENA experiment, marking an important first step for precision studies of atomic antimatter. This paper describes the first production and some subsequent developments. 
M. C. Fujiwara, M. Amoretti, C. Amsler, G. Bonomi, A.Bouchta, P.D.   Bowe, C. Carraro, C.L. Cesar, M. Charlton, M. Doser, V....