Branching-ratio measurements of multiphoton decays of positronium

Positronium (Ps) decay to four- and five-photon final states has been measured. From a sample of 3.73x10{sup 9} detected events of Ps annihilation, the QED-allowed branching ratios of para-Ps to four photons R{sub 4}=1.14(33)(21)x10{sup -6} (stat., sys., 68% C.L.), and ortho-Ps to five photons R{sub...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2002-11, Vol.66 (5), Article 052505
Main Authors: Vetter, P. A., Freedman, S. J.
Format: Article
Language:English
Subjects:
ANNIHILATION
ATOMIC AND MOLECULAR PHYSICS
BRANCHING RATIO
DECAY
EFFICIENCY
ENERGY RESOLUTION
GE SEMICONDUCTOR DETECTORS
MULTI-PHOTON PROCESSES
PHOTONS
POSITRONIUM
QUANTUM ELECTRODYNAMICS
SYMMETRY
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Summary:Positronium (Ps) decay to four- and five-photon final states has been measured. From a sample of 3.73x10{sup 9} detected events of Ps annihilation, the QED-allowed branching ratios of para-Ps to four photons R{sub 4}=1.14(33)(21)x10{sup -6} (stat., sys., 68% C.L.), and ortho-Ps to five photons R{sub 5}=1.67(99)(37)x10{sup -6} (68% C.L.) were measured. No charge-conjugation symmetry violating events were observed, establishing a branching ratio limit for (o-Ps{yields}4{gamma}) of R{sub 4}{sup Ce}
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.66.052505