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A SEARCH FOR A KEV PSEUDOSCALAR IN THE TWO-BODY DECAY OF ORTHOPOSITRONIUM

Authors
  • Gninenko, S.N.
  • Klubakov, Yu.M.
  • Poblaguev, A.A.
  • Postoev, V.E.
Publication Date
Jan 01, 1990
Identifiers
DOI: 10.1016/0370-2693(90)91446-I
OAI: oai:inspirehep.net:297400
Source
INSPIRE-HEP
Keywords
License
Unknown
External links

Abstract

We have searched for the exotic annihilation of orthopositronium: e + e − ( 3 S 1 )→γ+ a , where a is a light neutral pseudoscalar. The upper limit on the ratio of this decay rate to the 3γ decay rate obtained is Γ (o-Ps→ γ +a)/ Γ (o-Ps→3 γ )<3.8×10 −4 (90% CL), if the mass m a <30 keV. This result excludes the hypothesis of Samuel that this decay may resolve the discrepancy between the theoretical and experimental values of the orthopositronium lifetime in vacuum if the a mass is under 5.7 keV.

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