Search for ηc (2S) →π+π-ηc and ηc (2S) →π+π- KS0 K±π∓ decays

Journal
Physical Review D
ISSN
24700010
Date Issued
2024-04-01
Author(s)
Ablikim, M.
Achasov, M. N.
Adlarson, P.
Afedulidis, O.
Ai, X. C.
Aliberti, R.
Amoroso, A.
An, Q.
Bai, Y.
Bakina, O.
Balossino, I.
Ban, Y.
Bao, H. R.
Batozskaya, V.
Begzsuren, K.
Berger, N.
Berlowski, M.
Bertani, M.
Bettoni, D.
Bianchi, F.
Bianco, E.
Bortone, A.
Boyko, I.
Briere, R. A.
Brueggemann, A.
Cai, H.
Cai, X.
Calcaterra, A.
Cao, G. F.
Cao, N.
Cetin, S. A.
Chang, J. F.
Che, G. R.
Chelkov, G.
Chen, 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.
Choi, S. K.
Cibinetto, G.
Cossio, F.
Cui, J. J.
Dai, H. L.
Dai, J. P.
Dbeyssi, A.
De Boer, R. E.
Dedovich, D.
Deng, C. Q.
Deng, Z. Y.
Denig, A.
Denysenko, I.
Destefanis, M.
De Mori, F.
Ding, B.
Ding, X. X.
Ding, Y.
Ding, Y.
Dong, J.
Dong, L. Y.
Dong, M. Y.
Dong, X.
Du, M. C.
Du, S. X.
Duan, Y. Y.
Duan, Z. H.
Egorov, P.
Fan, Y. H.
Fang, J.
Fang, J.
Fang, S. S.
Fang, W. X.
Fang, Y.
Fang, Y. Q.
Farinelli, R.
Fava, L.
Feldbauer, F.
Felici, G.
Feng, C. Q.
Feng, J. H.
Feng, Y. T.
Fritsch, M.
Fu, C. D.
Fu, J. L.
Fu, Y. W.
Gao, H.
Gao, X. B.
Gao, Y. N.
DOI
Abstract
Based on (27.12±0.14)×108 ψ(2S) events collected by the BESIII detector, we search for the decay ηc(2S)→π+π-ηc via ψ(2S)→γηc(2S). No significant signal is observed, and the upper limit on the product branching fraction B(ψ(2S)→γηc(2S))×B(ηc(2S)→π+π-ηc) is determined to be 2.21×10-5 at the 90% confidence level. In addition, the ηc(2S)→π+π-KS0K±π∓ decay is studied via ψ(2S)→γηc(2S) and is observed with a statistical significance of 10σ for the first time. The branching fraction of ηc(2S)→π+π-KS0K±π∓ is determined to be (1.33±0.11±0.40±0.95)×10-2, where the first uncertainty is statistical, the second is systematic, and the third uncertainty is due to the quoted B(ψ(2S)→γηc(2S)).
Volume
109