A search for massive neutral bosons in orthopositronium decay

T. Maeno; M. Fujikawa; J. Kataoka; Y. Nishihara; S. Orito; K. Shigekuni; Y. Watanabe

doi:10.1016/0370-2693(95)00425-K

A search for massive neutral bosons in orthopositronium decay

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

Research output: Contribution to journal › Article › peer-review

18 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 language	English
Pages (from-to)	574-578
Number of pages	5
Journal	Physics Letters B
Volume	351
Issue number	4
DOIs	https://doi.org/10.1016/0370-2693(95)00425-K
Publication status	Published - 1995 Jun 1
Externally published	Yes

Keywords

Decay rate
Exotic decay
Germanium detector
Neutral boson
Orthopositronium decay
QED

ASJC Scopus subject areas

Nuclear and High Energy Physics

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title = "A search for massive neutral bosons in orthopositronium decay",

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.",

keywords = "Decay rate, Exotic decay, Germanium detector, Neutral boson, Orthopositronium decay, QED",

author = "T. Maeno and M. Fujikawa and J. Kataoka and Y. Nishihara and S. Orito and K. Shigekuni and Y. Watanabe",

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T1 - A search for massive neutral bosons in orthopositronium decay

AU - Maeno, T.

AU - Fujikawa, M.

AU - Kataoka, J.

AU - Nishihara, Y.

AU - Orito, S.

AU - Shigekuni, K.

AU - Watanabe, Y.

PY - 1995/6/1

Y1 - 1995/6/1

N2 - 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.

AB - 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.

KW - Decay rate

KW - Exotic decay

KW - Germanium detector

KW - Neutral boson

KW - Orthopositronium decay

KW - QED

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A search for massive neutral bosons in orthopositronium decay

Abstract

Keywords

ASJC Scopus subject areas

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