X(3872), Xb, and the χb₁(3P) state

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We discuss the possible production and discovery channels in e+e- and pp machines of the Xb, the bottomonium counterpart of X(3872) and the putative isoscalar analogue of the charged bottomonium-like states Zb discovered by Belle. We suggest that the Xb may be close in mass to the bottomonium state χb₁(3P), mixing with it and sharing its decay channels, just as X(3872) is likely a mixture of a D D* molecule and χc₁(2P). Consequently, the experiments which reported observing χb₁(3P) might have actually discovered the Xb, or a mixture of the two states.