Extraction of baryonia from the lightest anti-protonic atoms

Abstract

Anti-protonic hydrogen and helium atoms are analyzed. Level shifts and width are expressed in terms of p-nucleon sub-threshold scattering lengths and volumes. Experimental data are compared to results obtained from the 2009 version of the Paris N N interaction potential. Comparison with 1999 version is also made. Effects of N N quasi-bound states are discussed. Atomic 2P hyperfine structure is calculated for antiprotonic deuterium and the significance of new measurements is indicated.