Two-Loop Correction to the Orthopositronium Decay Rate
نویسندگان
چکیده
منابع مشابه
Virtual annihilation contribution to orthopositronium decay rate
Positronium, the bound state of an electron and positron, is an excellent laboratory to test our understanding of Quantum Electrodynamics of bound states. Although in the majority of cases the agreement between theory and experiment is very good, the case of orthopositronium (o-Ps) decay into three photons is outstanding, since the theoretical predictions differ by about 6 standard deviations f...
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Order α 2 corrections to the decay rate of orthopositronium are calculated in the framework of nonrelativistic QED. The resulting contribution is found to be in significant disagreement with one set of experimental measurements, though another experiment is in agreement with theory. The discrepancy between theory and experiment for the decay rate of orthopositronium has long been one of the out...
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Applying asymptotic expansions at threshold, we compute the two-loop QCD correction to the short-distance coefficient that governs the leptonic decay ψ → l+l− of a S-wave quarkonium state and discuss its impact on the relation between the quarkonium non-relativistic wave function at the origin and the quarkonium decay constant in full QCD. PACS Nos.: 13.20.Gd, 12.38.Bx Quarkonium decays played ...
متن کاملFirst test of O(α) correction of the orthopositronium decay rate
Positronium is an ideal system for the research of the bound state QED. New precise measurement of orthopositronium decay rate has been performed with an accuracy of 150 ppm. This result is consistent with the last three results and also the 2nd order correction. The result combined with the last three is 7.0401±0.0007μsec (100 ppm), which is consistent with the 2nd order correction and differs...
متن کاملPrecision Measurement of Orthopositronium Decay Rate Using SiO2 Powder
The intrinsic decay rate of orthopositronium formed in SiO2 powder is measured using the direct 2γ correction method such that the time dependence of the pick-off annihilation rate is precisely determined using high energy-resolution germanium detectors. As a systematic test, two different types of SiO2 powder are used with consistent findings. The intrinsic decay rate of orthopositronium is fo...
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ژورنال
عنوان ژورنال: Annals of Physics
سال: 2002
ISSN: 0003-4916
DOI: 10.1006/aphy.2001.6219