Observation of X(2370) and search for X(2120) in $$J/\psi \rightarrow \gamma K{\bar{K}} \eta '$$: BESIII Collaboration
Using a sample of 1.31 × 109 J/ψ events collected with the BESIII detector, we perform a study of J/ψ → γKK¯η'. X(2370) is observed in the KK¯η' invariant-mass distribution with a statistical significance of 8.3σ. Its resonance parameters are measured to be M = 2341.6 ± 6.5(stat.) ± 5.7(syst.) MeV/c2 and Γ = 117 ± 10(stat.) ± 8(syst.) MeV. The product branching fractions for J/ψ → γX(2370), X(2370) → K+K–η' and J/ψ → γX(2370), X(2370) → $$K$$ $$^{0}_{S}$$ $$K$$ $$^{0}_{S}$$η' are determined to be (1.79 ± 0.23(stat.) ± 0.65(syst.)) × 10–5 and (1.18 ± 0.32(stat.) ± 0.39(syst.)) × 10–5, respectively. No evident signal for X(2120) is observed in the KK¯η' invariant-mass distribution. The upper limits for the product branching fractions of B(J/ψ → γX(2120) → γK+K–η') and B(J/ψ → γX(2120) → $$K$$ $$^{0}_{S}$$ $$K$$ $$^{0}_{S}$$η') are determined to be 1.49 × 10–5 and 6.38 × 10–6 at the 90% confidence level, respectively.
- Research Organization:
- Indiana Univ., Bloomington, IN (United States); Carnegie Mellon Univ., Pittsburgh, PA (United States); Univ. of Minnesota, Minneapolis, MN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Contributing Organization:
- BESIII Collaboration
- Grant/Contract Number:
- FG02-05ER41374; SC0010118; SC0012069; 2015CB856700; 11625523; 11635010; 11675183; 11675184; 11947413; 11705078; 11735014; 11835012; 11905092; U1532257; U1532258; U1732263; U1832207; QYZDJ-SSW-SLH003; QYZDJ-SSW-SLH040; 530-4CDP03; DPT2006K-120470; 2016.0157; DH160214
- OSTI ID:
- 1800298
- Journal Information:
- European Physical Journal. C, Particles and Fields, Vol. 80, Issue 8; ISSN 1434-6044
- Publisher:
- SpringerCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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