title: Density shift and broadening of transition lines in antiprotonic helium
abstract: The density shift and broadening of the transition lines of antiprotonic helium have been evaluated in the impact approximation using an interatomic potential calculated ab initio with the symmetry-adapted perturbation theory. The results help to remove an uncertainty of up to 10 ppm in the laser spectroscopy data on antiprotonic helium and are of importance in experimental tests of bound state QED and CPT invariance.
authors.affiliation: Institute for Nuclear Research and Nuclear Energy, Tsarigradsko Chaussee 72, Sofia 1784, Bulgaria.
authors.initials: D
authors.lastname: Bakalov
authors.initials: B
authors.lastname: Jeziorski
authors.initials: T
authors.lastname: Korona
authors.initials: K
authors.lastname: Szalewicz
authors.initials: E
authors.lastname: Tchoukova