Observation of $\chi_{c2}\to\eta'\eta'$ and $\chi_{c0,2}\to\eta\eta'$

Using a sample of 448.1×106 ψ(3686) events collected with the BESIII detector in 2009 and 2012, we study the decays χc0,2→η′η′ and ηη′. The decays χc2→η′η′, χc0→ηη′ and χc2→ηη′ are observed for the first time with statistical significances of 9.6σ, 13.4σ and 7.5σ, respectively. The branching fractions are determined to be B(χc0→η′η′)=(2.19±0.03±0.14)×10-3, B(χc2→η′η′)=(4.76±0.56±0.38)×10-5, B(χc0→ηη′)=(8.92±0.84±0.65)×10-5 and B(χc2→ηη′)=(2.27±0.43±0.25)×10-5, where the first uncertainties are statistical and the second are systematic. The precision for the measurement of B(χc0→η′η′) is significantly improved compared to previous measurements. Based on the measured branching fractions, the role played by the doubly and singly Okubo-Zweig-Iizuka disconnected transition amplitudes for χc0,2 decays into pseudoscalar meson pairs can be clarified.

Note:

7 pages, 3 figures

electron positron: annihilation
electron positron: colliding beams
psi(3685): electroproduction
eta(958): pair production
eta: associated production
chi/c2(3555): hadronic decay
chi/c0(3415): hadronic decay
chi/c0(3415): branching ratio: measured
chi/c2(3555): branching ratio: measured
statistical

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Observation of χc2→η′η′\chi_{c2}\to\eta'\eta'χc2​→η′η′ and χc0,2→ηη′\chi_{c0,2}\to\eta\eta'χc0,2​→ηη′

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Observation of $\chi_{c2}\to\eta'\eta'$ and $\chi_{c0,2}\to\eta\eta'$