Search for η and η invisible decays in J/ψ→η and η

M. Ablikim, M. N. Achasov, O. Albayrak, D. J. Ambrose, F. F. An, Q. An, J. Z. Bai, Y. Ban, J. Becker, J. V. Bennett, M. Bertani, J. M. Bian, E. Boger, O. Bondarenko, I. Boyko, R. A. Briere, V. Bytev, X. Cai, O. Cakir, A. CalcaterraG. 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, J. Fang, S. S. Fang, H. Muramatsu, R. Poling, BESIII Collaboration

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Using a sample of (225.3±2.8)×106 J/ψ decays collected with the BESIII detector at BEPCII, searches for invisible decays of η and η in J/ψ→η and η are performed. Decays of →K+K- are used to tag the η and η decays. No signals above background are found for the invisible decays, and upper limits at the 90% confidence level are determined to be 2.6×10-4 for the ratio B(η→invisible) B(η→γγ) and 2.4×10-2 for B(η→invisible)B(η →γγ). These limits may be used to constrain light dark matter particles or spin-1 U bosons.

Original languageEnglish (US)
Article number012009
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number1
StatePublished - Jan 24 2013

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Publisher Copyright:
© 2013 American Physical Society.


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