Proposed test of charge-conjugation invariance in positronium decay

Mani, H. S. ; Rich, Arthur (1971) Proposed test of charge-conjugation invariance in positronium decay Physical Review D, 4 (1). pp. 122-127. ISSN 0556-2821

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If the electromagnetic interactions are invariant under charge conjugation, C, then singlet positronium (Ps) can only decay into an even number of photons, while triplet Ps can only decay into an odd number of photons. In this paper we consider a model Hamiltonian which violates C invariance but conserves parity. If λ is the coupling constant in the proposed C-noninvariant interaction, then the branching ratio of the forbidden decay, 13S1→4λ, to the allowed decay, 13S1→3λ, has been found to be FT=1.2×10-5λ2. An experimental upper limit on FT would provide a novel check of C invariance in electromagnetic interactions, and would also yield new information on the e- eγγγγ interaction. At present, indirect limits on FT show it to be less than about 10-2. We are now working on an experiment which is designed to reduce this upper limit to 10-5-10-6. If successful, it will subject the proposed interaction, or any similar interaction leading to 13S1→4γ, to a stringent test. An outline of the experiment is included in this paper.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:20198
Deposited On:20 Nov 2010 14:52
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