O(α2Γ,α3Γ)binding effects in orthopositronium decay
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 ...
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In models of Randall-Sundrum type orthopositronium (o − P s) can disappear due to tunnelling into additional dimension(s). The experimental signature of this effect is the invisible decay of orthopositronium. We point out that this process may occur at a rate within two or three orders of magnitude of the present experimental upper limit. We discuss this in details and stress that the existence...
متن کاملThe Orthopositronium Decay Puzzle and Primordial Nucleosynthesis
The discrepancy between the experimental decay rate of orthopositronium (o-Ps) and the QED theoretical prediction can be solved by invoking decays of o-Ps into exotic particles with branching ratios ∼ 10. We show that considerations based on primordial nucleosynthesis and effective Lagrangians place a very stringent upper bound: B ≡ Γ(o-Ps → “exotic” + ...)/Γ(o-Ps) ≤ 2 × 10, ruling out the exot...
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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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We have searched for an exotic decay of orthopositronium into a single photon and a short-lived neutral boson in the hitherto unexplored mass region above 900 keV=c 2 , by noting that this decay is one of few remaining candidates which could explain the discrepancy of the orthopositronium decay-rate. A high-resolution measurement of the associated photon energy spectrum was carried out with a g...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2000
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.62.111301