2004
DOI: 10.1142/s0217751x04020142
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Precision Study of Positronium: Testing Bound State Qed Theory

Abstract: As an unstable light pure leptonic system, positronium is a very specific probe atom to test bound state QED. In contrast to ordinary QED for free leptons, the bound state QED theory is not so well understood and bound state approaches deserve highly accurate tests. We present a brief overview of precision studies of positronium paying special attention to uncertainties of theory as well as comparison of theory and experiment. We also consider in detail advantages and disadvantages of positronium tests compare… Show more

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Cited by 119 publications
(113 citation statements)
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“…In principle weak interactions apply, but at a level that is very far away from any experiment currently conceivable [142,143]. Therefore Ps is extremely well described by (boundstate) quantum electrodynamics (QED) [144,145], and hence can be used to test the theory. Furthermore, since it lacks any hadronic component (in contrast to hydrogen, in which the proton structure affects the energy levels), it may be possible to use…”
Section: Intrinsic Properties Of Positroniummentioning
confidence: 99%
See 1 more Smart Citation
“…In principle weak interactions apply, but at a level that is very far away from any experiment currently conceivable [142,143]. Therefore Ps is extremely well described by (boundstate) quantum electrodynamics (QED) [144,145], and hence can be used to test the theory. Furthermore, since it lacks any hadronic component (in contrast to hydrogen, in which the proton structure affects the energy levels), it may be possible to use…”
Section: Intrinsic Properties Of Positroniummentioning
confidence: 99%
“…One of the motivations driving Ps experimentation, particularly spectroscopic [103,107,228,264,322,377] and lifetime [82,83,163,195] measurements, is that, as a system composed of two low-mass leptons, Ps is an ideal testing ground for QED theory [144]. Precision measurements performed using a wide variety of both hydrogenic and non-hydrogenic atoms, ions, and molecules are, of course, also used for QED tests (e.g.…”
Section: Precision Spectroscopymentioning
confidence: 99%
“…Beyond the standard model, we will look at constraints to consider a composite muon. For this, we will compare the muon in para positronium, p-Ps [12]. The latter is composed of a single electron-positron pair.…”
Section: Discussionmentioning
confidence: 99%
“…The order 6 for the fine structure constant, is that of orthopositronium [12]. The 5/4 ratio is a free parameter.…”
mentioning
confidence: 99%
“…A problem with free particle QED lies in the difficulty in obtaining exact solutions to the calculations involved and thus in obtaining predictions for measurable quantities such as energy (Karshenboim, 2004;Eides et al, 2001). Calculations such as those involved in scattering or decay problems present a particular challenge due to the number and complexity of the interactions (virtual particle exchanges) between the field and the bodies of interest that must be considered.…”
Section: Introductionmentioning
confidence: 99%