| Summary: | We calculate the masses of χc(2P) and χb(3P) states with threshold corrections in a coupled-channel model. Here, the meson quarkonium core is augmented by higher Fock components due to pair-creation effects. According to our results, we interpret the resonances characterized by very small threshold corrections, like χb(3P)'s, as almost pure quarkonia, and those states characterized by non-negligible threshold corrections, like the X(3872), as quarkonium cores plus meson–meson components. We also study the J/ψρ and J/ψω hidden-flavor strong decays of the X(3872). The decays are calculated as the dissociation of one of these components (D0D¯0⁎) into a cc¯ state (J/ψ) plus a light meson (ρ or ω) in a potential model. In particular, our result for the ratio between the X(3872)→J/ψω and J/ψρ widths (0.6) is compatible with the present experimental data (0.8±0.3) within the experimental error. Keywords: X(3872), χc(2P), χb(3P), Heavy quarkonium spectroscopy, Hidden-flavor strong decays
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