Photon-photon scattering contribution to the decay rate of orthopositronium
نویسندگان
چکیده
منابع مشابه
The photon spectrum in orthopositronium decay
A closed analytic expression is given for the spectrum of low energy photons in the annihilation of orthopositronium, which expression sums all the effects of the Coulomb interaction between the electron and the positron. The applicability of the formula is limited only by the condition ω γ ≪ m e. In the region ω γ ≫ m e α 2 the Coulomb interaction term gives the leading at low energy one-loop ...
متن کاملVirtual 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...
متن کاملOrder α 2 corrections to the decay rate of orthopositronium
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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Hadronic interactions of two quasi-real photons have been studied extensively both during the LEP1 and the LEP2 data taking periods. The higher energies available at LEP2 in particular opened regions of phase space where hadronic processes can be predicted reliably by perturbative QCD calculations, usually available to next-to-leading order in the strong coupling constant for the process concer...
متن کاملEffective QCD coupling and power corrections to photon-photon scattering
The scattering of two off-shell photons is an infrared-safe process in QCD. For photon virtualities Q in the range of a few GeV, accessible at LEPII, powerbehaved contributions in (ΛQCD/Q) n to the total cross section may become non-negligible. Based on a dispersion relation for the running coupling, we discuss these contributions and calculate the coefficients of the leading power correction f...
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ژورنال
عنوان ژورنال: Lettere Al Nuovo Cimento Series 1
سال: 1970
ISSN: 0375-930X,1827-613X
DOI: 10.1007/bf02753661