Partial wave analysis of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mi>γ</mml:mi><mml:msup><mml:mi>η</mml:mi><mml:mo>′</mml:mo></mml:msup><mml:msup><mml:mi>η</mml:mi><mml:mo>′</mml:mo></mml:msup></mml:math>

Using a sample of (10.09±0.04)×109 J/ψ events collected with the BESIII detector, partial wave analysis J/ψ→γη′η′ is performed. The masses and widths observed resonances their branching fractions are reported. main contribution from J/ψ→γf0(2020) f0(2020)→η′η′, which found significance greater than 25σ. product fraction B(J/ψ→γf0(2020))·B(f0(2020)→η′η′) measured to be (2.63±0.06(stat.)−0.46+0.31(syst.))×10−4.Received 24 January 2022Accepted 11 March 2022DOI:https://doi.org/10.1103/PhysRevD.105.072002Published by American Physical Society under terms Creative Commons Attribution 4.0 International license. Further distribution this work must maintain attribution author(s) published article’s title, journal citation, DOI. Funded SCOAP3.Published SocietyPhysics Subject Headings (PhySH)Research AreasBranching fractionLeptonic, semileptonic & radiative decaysParticles Fields