TY - JOUR
T1 - Search for ηc (2S) →π+π-ηc and ηc (2S) →π+π- KS0 K±π∓ decays
AU - Ablikim, M.
AU - Achasov, M. N.
AU - Adlarson, P.
AU - Afedulidis, O.
AU - Kabana, S.
AU - The BESIII collaboration
N1 - Publisher Copyright:
© 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.
PY - 2024/4/1
Y1 - 2024/4/1
N2 - 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)).
AB - 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)).
UR - https://www.scopus.com/pages/publications/85192753739
U2 - 10.1103/PhysRevD.109.072017
DO - 10.1103/PhysRevD.109.072017
M3 - Article
AN - SCOPUS:85192753739
SN - 2470-0010
VL - 109
JO - Physical Review D
JF - Physical Review D
IS - 7
M1 - 072017
ER -