Search for long-lived neutral bosons in orthopositronium decay

Details Search for long-lived neutral bosons in orthopositronium decay Search for long-lived neutral bosons in orthopositronium decay

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phrvl..66.2440a&link_type=abstract

Physical Review Letters (ISSN 0031-9007), vol. 66, May 13, 1991, p. 2440-2443.

Astronomy and Astrophysics

Astrophysics

21

Bosons, Nuclear Astrophysics, Positronium, Radioactive Decay, Broken Symmetry, Energy Spectra, Gamma Rays, Spin, Weak Interactions (Field Theory), Experimental Tests

Scientific paper

A search has been conducted for orthopositronium decay into gamma plus a feebly interacting boson X0, by looking for a narrow peak in the energy spectrum of a single gamma taken under the condition of no additional gamma 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 x 10 to the -6th, which is a factor of 60 more stringent than previous limits in the m(chi) region below 30 keV. This experiment rules out the existence of light Goldstone-like bosons having electron-coupling constants larger than 1.1 x 10 to the -11th.

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