Lamb shift asymmetry

The Iq term, which is all that survives for an unpolarized beam, gives rise to the Lamb shift asymmetry discussed in the... 

In connection with this discussion of hindamental interactions we note that, besides hydrogen, there are numerous simple systems for which precision spectroscopic measurements can provide accurate tests of the QED theory and reveal effects beyond the Standard Model [9.367]. Positronium (e "-e ) and muonium (jil -e ) are hydrogen-like systems for which precise Lamb-shift and g-2 experiments have been performed. Precision spectroscopic studies on anti-hydrogen (antiproton-positron), once achievable, would certainly be extremely interesting in revealing possible asymmetries between the world and an anti-world [9.368]. 

Section II.A of this paper reviews the current state of theory aid experiment for Lamb shifts in hydrogenic ions. Section II.B discusses a number of recent experiments to detect a variety of asymmetries in the quenching of metastable 2si hydrogen and He, ... 

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