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 | |
| Publication status | Published - 1995 Jun 1 |
| Externally published | Yes |
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Keywords
- Decay rate
- Exotic decay
- Germanium detector
- Neutral boson
- Orthopositronium decay
- QED
ASJC Scopus subject areas
- Nuclear and High Energy Physics
Cite this
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 journal › Article
}
TY - JOUR
T1 - A search for massive neutral bosons in orthopositronium decay
AU - Maeno, T.
AU - Fujikawa, M.
AU - Kataoka, Jun
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
UR - http://www.scopus.com/inward/record.url?scp=0000604516&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0000604516&partnerID=8YFLogxK
U2 - 10.1016/0370-2693(95)00425-K
DO - 10.1016/0370-2693(95)00425-K
M3 - Article
AN - SCOPUS:0000604516
VL - 351
SP - 574
EP - 578
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
IS - 4
ER -