TY - JOUR
T1 - Search for long-lived neutral bosons in orthopositronium decay
AU - Asai, S.
AU - Orito, S.
AU - Yoshimura, K.
AU - Haga, T.
N1 - Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 1991
Y1 - 1991
N2 - We have searched for orthoposition decay into plus a feebly interacting boson X0, by looking for a narrow peak in the energy spectrum of single taken under the condition of no additional detected in a hermetic photon detector. No evidence of such decay is observed, resulting in a new upper limit on the branching ratio of 1.1×10-6, which is a factor of 60 more stringent than previous limits in the mx region below 30 keV. This experiment rules out the existence of light (mX<800 GeV) Goldstone-like bosons having electron-coupling constants ±Xee larger than 1.1×10-11.
AB - We have searched for orthoposition decay into plus a feebly interacting boson X0, by looking for a narrow peak in the energy spectrum of single taken under the condition of no additional detected in a hermetic photon detector. No evidence of such decay is observed, resulting in a new upper limit on the branching ratio of 1.1×10-6, which is a factor of 60 more stringent than previous limits in the mx region below 30 keV. This experiment rules out the existence of light (mX<800 GeV) Goldstone-like bosons having electron-coupling constants ±Xee larger than 1.1×10-11.
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U2 - 10.1103/PhysRevLett.66.2440
DO - 10.1103/PhysRevLett.66.2440
M3 - Article
AN - SCOPUS:4243724239
VL - 66
SP - 2440
EP - 2443
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 19
ER -