Partial wave analysis of J/ψ →γη η
Cetin, S. A.
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CitationAblikim, M., Achasov, M. N., Adlarson, P., Ahmed, S., Albrecht, M., Aliberti, R., . . . (BESIII Collaboration). (2022). Partial wave analysis of J/ψ →γη η. Physical Review D, 105(7) doi:10.1103/PhysRevD.105.072002
Using a sample of (10.09±0.04)×109 J/ψ events collected with the BESIII detector, a partial wave analysis of J/ψ→γη η is performed. The masses and widths of the observed resonances and their branching fractions are reported. The main contribution is from J/ψ→γf0(2020) with f0(2020)→η η , which is found with a significance of greater than 25σ. The product branching fraction B(J/ψ→γf0(2020)) B(f0(2020)→η η ) is measured to be (2.63±0.06(stat.)+0.31-0.46(syst.))×10-4. © 2022 American Physical Society. All rights reserved.