LHCb reports branching fractions B(b→χ_c0,1,2 X) and B(b→η_c(2S)X)×B(η_c(2S)→φφ) plus the most precise η_c(1S) mass from φφ decays in 5.9 fb⁻¹ of data.
del Amo Sanchezet al.,Observation of ηc(1S)and ηc(2S) decays to K +K −π+π−π0 in two-photon interactions, Phys
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Measurement of inclusive production of charmonium states in $b$-hadron decays via their decay into $\phi \phi$
LHCb reports branching fractions B(b→χ_c0,1,2 X) and B(b→η_c(2S)X)×B(η_c(2S)→φφ) plus the most precise η_c(1S) mass from φφ decays in 5.9 fb⁻¹ of data.