Search for η c ( 2 S ) → π + π − η c and η c ( 2 S ) → π + π − K S 0 K ± π ∓ decays

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doi:10.1103/PhysRevD.109.072017

Title: Search for $η_{c} (2 S) \to π^{+} π^{-} η_{c}$ and $η_{c} (2 S) \to π^{+} π^{-} K_{S}^{0} K^{\pm} π^{\mp}$ decays

Journal Article · 28 April 2024 · Physical Review. D.

DOI: https://doi.org/10.1103/PhysRevD.109.072017 · OSTI ID:2341696

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 »

Based on $(27.12 \pm 0.14) \times 10^{8} ψ (2 S)$ events collected by the BESIII detector, we search for the decay $η_{c} (2 S) \to π^{+} π^{-} η_{c}$ via $ψ (2 S) \to γ η_{c} (2 S)$ . No significant signal is observed, and the upper limit on the product branching fraction $B (ψ (2 S) \to γ η_{c} (2 S)) \times B (η_{c} (2 S) \to π^{+} π^{-} η_{c}$ ) is determined to be $2.21 \times 10^{- 5}$ at the 90% confidence level. In addition, the $η_{c} (2 S) \to π^{+} π^{-} K_{S}^{0} K^{\pm} π^{\mp}$ decay is studied via $ψ (2 S) \to γ η_{c} (2 S)$ and is observed with a statistical significance of $10 σ$ for the first time. The branching fraction of $η_{c} (2 S) \to π^{+} π^{-} K_{S}^{0} K^{\pm} π^{\mp}$ is determined to be ( $1.33 \pm 0.11 \pm 0.40 \pm 0.95$ ) $\times 10^{- 2}$ , where the first uncertainty is statistical, the second is systematic, and the third uncertainty is due to the quoted $B (ψ (2 S) \to γ η_{c} (2 S))$ . Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-05ER41374

OSTI ID:: 2341696

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 7 Vol. 109; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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