First evidence reported for X(3872)→π⁰χ_c0 decay at 3.4σ, with branching fraction ratio 2.3 relative to π⁺π⁻J/ψ, upper limits on other modes, and no signal for X(3915)→π⁰χ_c1.
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Belle II sets 90% CL upper limits on the Born cross sections for e+e−→γχbJ near √s=10.746 GeV, with those for χb1 being significantly smaller than for ωχb1 and π+π−Υ(2S).
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First evidence of $X(3872)\to\pi^0\chi_{c0}(1P)$ and search for $X(3915)\to\pi^0\chi_{c1}(1P)$
First evidence reported for X(3872)→π⁰χ_c0 decay at 3.4σ, with branching fraction ratio 2.3 relative to π⁺π⁻J/ψ, upper limits on other modes, and no signal for X(3915)→π⁰χ_c1.
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Search for $e^+ e^- \to \gamma\chi_{bJ}$ ($J$ = 0, 1, 2) near $\sqrt{s} = 10.746$ GeV at Belle II
Belle II sets 90% CL upper limits on the Born cross sections for e+e−→γχbJ near √s=10.746 GeV, with those for χb1 being significantly smaller than for ωχb1 and π+π−Υ(2S).