Observation of the decay h_c→3(π^+π^-)π^0

BESIII Collaboration,M. Ablikim,M. N. Achasov,P. Adlarson,O. Afedulidis, X. C. Ai,R. Aliberti,A. Amoroso,Q. An,Y. Bai,O. Bakina,I. Balossino,Y. Ban,H. -R. Bao,V. Batozskaya,K. Begzsuren,N. Berger,M. Berlowski,M. Bertani,D. Bettoni,F. Bianchi,E. Bianco,A. Bortone,I. Boyko,R. A. Briere,A. Brueggemann,H. Cai,X. Cai,A. Calcaterra,G. F. Cao,N. Cao,S. A. Cetin,J. F. Chang,G. R. Che,G. Chelkov, C. Chen, C. H. Chen,Chao Chen,G. Chen,H. S. Chen,H. Y. Chen,M. L. Chen,S. J. Chen,S. L. Chen,S. M. Chen,T. Chen, X. R. Chen,X. T. Chen,Y. B. Chen,Y. Q. Chen,Z. J. Chen,Z. Y. Chen,S. K. Choi,G. Cibinetto,F. Cossio,J. J. Cui,H. L. Dai,J. P. Dai,A. Dbeyssi,R. E. de Boer,D. Dedovich,C. Q. Deng,Z. Y. Deng,A. Denig,I. Denysenko,M. Destefanis,F. De Mori,B. Ding,X. X. Ding, Y. Ding,Y. Ding,J. Dong, L. Y. Dong,M. Y. Dong,X. Dong,M. C. Du,S. X. Du,Y. Y. Duan,Z. H. Duan,P. Egorov,Y. H. Fan, J. Fang,J. Fang,S. S. Fang,W. X. Fang,Y. Fang,Y. Q. Fang,R. Farinelli,L. Fava,F. Feldbauer,G. Felici,C. Q. Feng,J. H. 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arxiv（2024）

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Abstract

Based on (2712.4±14.1)×10^6 ψ(3686) events collected with the BESIII detector, we study the decays h_c→3(π^+π^-)π^0, h_c→2(π^+π^-)ω, h_c→2(π^+π^-)π^0η, h_c→2(π^+π^-)η, and h_c→ pp̅ via ψ(3686)→π^0h_c. The decay channel h_c→3(π^+π^-)π^0 is observed for the first time, and its branching fraction is determined to be ( 9.28± 1.14 ± 0.77) ×10^ - 3, where the first uncertainty is statistical and the second is systematic. In addition, first evidence is found for the modes h_c→ 2(π^+π^-)π^0η and h_c→2(π^+π^-)ω with significances of 4.8σ and 4.7σ, and their branching fractions are determined to be (7.55±1.51±0.77)×10^-3 and ( 4.00 ± 0.86 ± 0.35) ×10^ - 3, respectively. No significant signals of h_c→ 2(π^+π^-)η and h_c→ pp̅ are observed, and the upper limits of the branching fractions of these decays are determined to be <6.19×10^-4 and <4.40×10^-5 at the 90 respectively.

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