A search for massive neutral bosons in orthopositronium decay

T. Maeno, M. Fujikawa, Jun Kataoka, Y. Nishihara, S. Orito, K. Shigekuni, Y. Watanabe

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

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/c2, 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 germanium detector to search for a sharp peak from this two-body decay. Our negative result provides an upper limit of 2.0 × 10-4 on the branching ratio of such a decay in the mass region from 847 to 1013 keV/c2, and excludes the possibility of this decay mode explaining the discrepancy in the orthopositronium decay rate.

Original languageEnglish
Pages (from-to)574-578
Number of pages5
JournalPhysics Letters B
Volume351
Issue number4
DOIs
Publication statusPublished - 1995 Jun 1
Externally publishedYes

Fingerprint

bosons
decay
decay rates
photons
germanium
energy spectra
high resolution
detectors

Keywords

  • Decay rate
  • Exotic decay
  • Germanium detector
  • Neutral boson
  • Orthopositronium decay
  • QED

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Maeno, T., Fujikawa, M., Kataoka, J., Nishihara, Y., Orito, S., Shigekuni, K., & Watanabe, Y. (1995). A search for massive neutral bosons in orthopositronium decay. Physics Letters B, 351(4), 574-578. https://doi.org/10.1016/0370-2693(95)00425-K

A search for massive neutral bosons in orthopositronium decay. / Maeno, T.; Fujikawa, M.; Kataoka, Jun; Nishihara, Y.; Orito, S.; Shigekuni, K.; Watanabe, Y.

In: Physics Letters B, Vol. 351, No. 4, 01.06.1995, p. 574-578.

Research output: Contribution to journalArticle

Maeno, T, Fujikawa, M, Kataoka, J, Nishihara, Y, Orito, S, Shigekuni, K & Watanabe, Y 1995, 'A search for massive neutral bosons in orthopositronium decay', Physics Letters B, vol. 351, no. 4, pp. 574-578. https://doi.org/10.1016/0370-2693(95)00425-K
Maeno T, Fujikawa M, Kataoka J, Nishihara Y, Orito S, Shigekuni K et al. A search for massive neutral bosons in orthopositronium decay. Physics Letters B. 1995 Jun 1;351(4):574-578. https://doi.org/10.1016/0370-2693(95)00425-K
Maeno, T. ; Fujikawa, M. ; Kataoka, Jun ; Nishihara, Y. ; Orito, S. ; Shigekuni, K. ; Watanabe, Y. / A search for massive neutral bosons in orthopositronium decay. In: Physics Letters B. 1995 ; Vol. 351, No. 4. pp. 574-578.
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