Search for short-lived neutral bosons in orthopositronium decay

S. Asai, K. Shigekuni, Tomoyuki Sanuki, S. Orito

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

We searched for an exotic decay of orthopositronium into a single photon and a short-lived neutral boson ø0 in hitherto unexplored mass region below 300 keV/c2. A high-resolution measurement of the associated photon energy spectrum was carried out with a germanium detector to discriminate the expected sharp peak of this decay from the broader peak of the pick-off annihilations. No evidence of such decay was observed, resulting in the upper-limits on the branching ratio of 3.0×10-4 (mΦ0 <500 keV/c2). This clearly rules out the possibility of this exotic decay mode explaining the reported discrepancy in the orthopositronium decay rate.

Original languageEnglish
Pages (from-to)90-94
Number of pages5
JournalPhysics Letters B
Volume323
Issue number1
DOIs
Publication statusPublished - 1994 Mar 3
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Fingerprint Dive into the research topics of 'Search for short-lived neutral bosons in orthopositronium decay'. Together they form a unique fingerprint.

  • Cite this