Observation of η c ( 2 S ) → K + K − η

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.; Cheng, L. N.; 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. 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doi:10.1103/PhysRevD.110.092003

Observation of $η_{c} (2 S) \to K^{+} K^{-} η$

Journal Article · Tue Nov 12 00:00:00 EST 2024 · Physical Review. D.

DOI:https://doi.org/10.1103/PhysRevD.110.092003· OSTI ID:2477098

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. more »

By analyzing $(27.12 \pm 0.14) \times 10^{8} ψ (3686)$ events accumulated with the BESIII detector, the decay $η_{c} (2 S) \to K^{+} K^{-} η$ is observed for the first time with a significance of $6.2 σ$ after considering systematic uncertainties. The product of the branching fractions of $ψ (3686) \to γ η_{c} (2 S)$ and $η_{c} (2 S) \to K^{+} K^{-} η$ is measured to be $B (ψ (3686) \to γ η_{c} (2 S)) \times B (η_{c} (2 S) \to K^{+} K^{-} η) = (2.39 \pm 0.32 \pm 0.34) \times 10^{- 6}$ , where the first uncertainty is statistical, and the second one is systematic. The branching fraction of $η_{c} (2 S) \to K^{+} K^{-} η$ is determined to be $B (η_{c} (2 S) \to K^{+} K^{-} η) = (3.42 \pm 0.46 \pm 0.48 \pm 2.44) \times 10^{- 3}$ , where the third uncertainty is due to the branching fraction of $ψ (3686) \to γ η_{c} (2 S)$ . Using a recent BESIII measurement of $B (η_{c} (2 S) \to K^{+} K^{-} π^{0})$ , we also determine the ratio between the branching fractions of $η_{c} (2 S) \to K^{+} K^{-} η$ and $η_{c} (2 S) \to K^{+} K^{-} π^{0}$ to be $1.49 \pm 0.22 \pm 0.25$ , which is consistent with the previous result of at a comparable precision level.

Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-05ER41374

OSTI ID:: 2477098

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 9 Vol. 110; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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