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P. Adlarson; M. Alekseev; J. F. Chang; J. C. Chen; A. Dbeyssi; A. Denig; S. X. Du; M. Fritsch; C. D. Fu; Y. Fu; Z. Gao; E. M. Gersabeck; W. X. Gong; W. Gradl; L. M. Gu; L. B. Guo; S. Han; F. H. Heinsius; G. S. Huang; N. Huesken; Q. Ji; H. B. Jiang; A. Kupsc; M. G. Kurth; J. S. Lange; T. Lenz; H. J. Li; J. C. Li; J. W. Li; P. L. Li; S. Y. Li; Z. Y. Li; J. Libby; C. X. Lin; Y. J. Lin; C. X. Liu; F. H. Liu; H. M. Liu; Huihui Liu; Q. Liu; Y. B. Liu; Y. P. Lu; C. L. Luo; F. C. Ma; L. L. Ma; M. M. Ma; X. Y. Ma; S. Marcello; Z. X. Meng; R. E. Mitchell; Y. Nefedov; F. Nerling; I. B. Nikolaev; Z. Ning; J. Pettersson; R. Poling; V. Prasad; H. R. Qi; X. P. Qin; J. F. Qiu; X. Y. Shen; X. Shi; S. Spataro; X. Tang; V. Thoren; M. Z. Wang; W. P. Wang; Y. Wang; Y. Q. Wang; T. Weber; U. Wiedner; L. J. Wu; Y. J. Xiao; Y. G. Xie; Y. H. Xie; F. Yan; H. X. Yang; Y. H. Yang; Yifan Yang; M. Ye; M. H. Ye; J. S. Yu; T. Yu; C. Z. Yuan; B. Y. Zhang; C. C. Zhang; J. Zhang; J. Y. Zhang; L. Zhang; Yao Zhang; Yi Zhang; Z. Y. Zhang; Lei Zhao; Ling Zhao; M. G. Zhao; T. C. Zhao; Z. G. Zhao; B. Zhong; K. Zhu; W. J. Zhu
The European physical journal. C, Particles and fields, 08/2020, Letnik: 80, Številka: 8Journal Article
Abstract Using a sample of $$1.31\times 10^{9} ~J/\psi $$ 1.31×109J/ψ events collected with the BESIII detector, we perform a study of $$J/\psi \rightarrow \gamma K{\bar{K}}\eta '$$ J/ψ→γKK¯η′ . X(2370) is observed in the $$K{\bar{K}}\eta '$$ KK¯η′ invariant-mass distribution with a statistical significance of $$8.3\sigma $$ 8.3σ . Its resonance parameters are measured to be $$M=2341.6\pm 6.5 \, \text {(stat.)} \pm 5.7 \, \text {(syst.)}~ \hbox {MeV}/c^{2}$$ M=2341.6±6.5(stat.)±5.7(syst.)MeV/c2 and $$\Gamma = 117\pm 10 \, \text {(stat.)}\pm 8 \, \text {(syst.)}~\hbox {MeV}$$ Γ=117±10(stat.)±8(syst.)MeV . The product branching fractions for $$J/\psi \rightarrow \gamma X(2370),X(2370)\rightarrow K^{+}K^{-}\eta '$$ J/ψ→γX(2370),X(2370)→K+K-η′ and $$J/\psi \rightarrow \gamma X(2370),X(2370)\rightarrow K_{S}^{0}K_{S}^{0}\eta '$$ J/ψ→γX(2370),X(2370)→KS0KS0η′ are determined to be $$(1.79\pm 0.23\, \text {(stat.)}\pm 0.65\,\text {(syst.)})\times 10^{-5}$$ (1.79±0.23(stat.)±0.65(syst.))×10-5 and $$(1.18\pm 0.32\, \text {(stat.)}\pm 0.39\, \text {(syst.)})\times 10^{-5}$$ (1.18±0.32(stat.)±0.39(syst.))×10-5 , respectively. No evident signal for X(2120) is observed in the $$K{\bar{K}}\eta '$$ KK¯η′ invariant-mass distribution. The upper limits for the product branching fractions of $${\mathcal {B}}(J/\psi \rightarrow \gamma X(2120)\rightarrow \gamma K^{+} K^{-} \eta ')$$ B(J/ψ→γX(2120)→γK+K-η′) and $${\mathcal {B}}(J/\psi \rightarrow \gamma X(2120)\rightarrow \gamma K_{S}^{0} K_{S}^{0} \eta ')$$ B(J/ψ→γX(2120)→γKS0KS0η′) are determined to be $$1.49\times 10^{-5}$$ 1.49×10-5 and $$6.38\times 10^{-6}$$ 6.38×10-6 at the 90% confidence level, respectively.
