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pro vyhledávání: '"Fell, Richard N."'
Positronium spectroscopy (n=1 hyperfine splitting, n=2 fine structure, and the 1S-2S interval) has reached a precision of order 1 MHz. Vigorous ongoing efforts to improve the experimental results motivate the calculation of the positronium energy lev
Externí odkaz:
http://arxiv.org/abs/1507.07841
Publikováno v:
Phys. Rev. A 90, 042502 (2014)
Recent and ongoing experimental work on the positronium spectrum motivates new efforts to calculate positronium energy levels at the level of three loop corrections. We have obtained results for one set of such corrections involving light-by-light sc
Externí odkaz:
http://arxiv.org/abs/1407.8232
Autor:
Adkins, Gregory S., Fell, Richard N.
Publikováno v:
Phys. Rev. A 89, 052518 (2014)
We have calculated the contribution to the positronium hyperfine splitting at order $m \alpha^7$ of the light-by-light scattering process in the exchange of two photons between the electron and positron. Our result is $\Delta E = -0.235355(8) m \alph
Externí odkaz:
http://arxiv.org/abs/1402.7040
Publikováno v:
Phys.Rev.D75:064011,2007
We study the effect of cosmological expansion on orbits--galactic, planetary, or atomic--subject to an inverse-square force law. We obtain the laws of motion for gravitational or electrical interactions from general relativity--in particular, we find
Externí odkaz:
http://arxiv.org/abs/gr-qc/0612146
Order $\alpha^2$ corrections to the decay rate of parapositronium are calculated. A QED scattering calculation of the amplitude for electron-positron annihilation into two photons at threshold is combined with the technique of effective field theory
Externí odkaz:
http://arxiv.org/abs/hep-ph/0305251
Positronium spectroscopy (n=1 hyperfine splitting, n=2 fine structure, and the 1S-2S interval) has reached a precision of order 1 MHz. Vigorous ongoing efforts to improve the experimental results motivate the calculation of the positronium energy lev
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9f4c0d47b8f633a6ff49402e120247b5
Recent and ongoing experimental work on the positronium spectrum motivates new efforts to calculate positronium energy levels at the level of three loop corrections. We have obtained results for one set of such corrections involving light-by-light sc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f42b651116411b84bdfbdca43ebdd696
Autor:
Adkins, Gregory S., Fell, Richard N.
We have calculated the contribution to the positronium hyperfine splitting at order $m ��^7$ of the light-by-light scattering process in the exchange of two photons between the electron and positron. Our result is $��E = -0.235355(8) m ��
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4cd55f1a468ebf194d6a469ad8273c0c
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