  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 the
putative 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 the
bottomonium state $\chi_{b1}(3P)$, mixing with it and sharing its decay
channels, 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 the
two states.
