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We discuss the possible production and discovery channels in $e^+e^-$ and$pp$ machines of the $X_b$, the bottomonium counterpart of $X(3872)$ and theputative isoscalar analogue of the charged bottomonium-like states $Z_b$discovered by Belle. We suggest that the $X_b$ may be close in mass to thebottomonium state $\chi_{b1}(3P)$, mixing with it and sharing its decaychannels, just as $X(3872)$ is likely a mixture of a $\bar D D^*$ molecule and$\chi_{c1}(2P)$. Consequently, the experiments which reported observing$\chi_{b1}(3P)$ might have actually discovered the $X_b$, or a mixture of thetwo states.

$X(3872)$, $X_b$, and the $\chi_{b1}(3P)$ state