Using a sample of 225.3 million J/ψ events collected with the BESIII detector at the BEPCII e+e- collider in 2009, searches for the decays of η and η′→π+e -ν̄e+c.c. in J/ψ→φη and φη′ are performed. The φ signals, which are reconstructed in K+K- final states, are used to tag η and η′ semileptonic decays. No signals are observed for either η or η′, and upper limits at the 90% confidence level are determined to be 7.3×10-4 and 5.0×10-4 for the ratios B(η→π+e-ν̄e+c.c.) B(η→π+π-π0) and B(η′→π +e-ν̄e+c.c.) B(η′→π+π-η), respectively. These are the first upper-limit values determined for η and η′ semileptonic weak decays.
|Original language||English (US)|
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|State||Published - Feb 15 2013|
Bibliographical notePublisher Copyright:
© 2013 American Physical Society.