Search for η and η′→π+ e-ν̄e+c.c. decays in J/ψ→φη and φη′

M. Ablikim, M. N. Achasov, O. Albayrak, D. J. Ambrose, F. F. An, Q. An, J. Z. Bai, R. Baldini Ferroli, Y. Ban, J. Becker, J. V. Bennett, M. Bertani, J. M. Bian, E. Boger, O. Bondarenko, I. Boyko, R. A. Briere, V. Bytev, H. Cai, X. CaiO. Cakir, A. Calcaterra, G. F. Cao, S. A. Cetin, J. F. Chang, G. Chelkov, G. Chen, H. S. Chen, J. C. Chen, M. L. Chen, S. J. Chen, X. Chen, Y. B. Chen, H. P. Cheng, Y. P. Chu, D. Cronin-Hennessy, H. L. Dai, J. P. Dai, D. Dedovich, Z. Y. Deng, A. Denig, I. Denysenko, M. Destefanis, W. M. Ding, Y. Ding, L. Y. Dong, M. Y. Dong, S. X. Du, H. Muramatsu, R. Poling, BESIII Collaboration

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Abstract

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 languageEnglish (US)
Article number032006
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume87
Issue number3
DOIs
StatePublished - Feb 15 2013

Bibliographical note

Publisher Copyright:
© 2013 American Physical Society.

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