Observation of η′ →π+π-π+π- and η′ →π+π-π0π0

M. Ablikim, M. N. Achasov, X. C. Ai, O. Albayrak, M. Albrecht, D. J. Ambrose, F. F. An, Q. An, J. Z. Bai, R. Baldini Ferroli, Y. Ban, J. V. Bennett, M. Bertani, J. M. Bian, E. Boger, O. Bondarenko, I. Boyko, S. Braun, R. A. Briere, H. CaiX. Cai, O. 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, X. R. Chen, Y. B. Chen, H. P. Cheng, X. K. Chu, 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, H. Muramatsu, R. Poling, BESIII Collaboration

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Using a sample of 1.3×109J/ψ events collected with the BESIII detector, we report the first observation of η′→π+π- π+π- and η′→π+π-π0π0. The measured branching fractions are B(η′→π+π-π+π-)=[8.53±0.69(stat.) ±0.64(syst.)]×10-5 and B(η′→π+π-π0π0)= [1.82±0.35(stat.)±0.18(syst.)]×10-4, which are consistent with theoretical predictions based on a combination of chiral perturbation theory and vector-meson dominance.

Original languageEnglish (US)
Article number251801
JournalPhysical review letters
Issue number25
StatePublished - Jun 25 2014

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