Three flavours of Hybrid orexhange: which is more attractive?
2008
This review summarises issues that have arisen since the appearance of "Rumsfeld Hadrons". We show that signals $\phi(2175)$; Y(4260) and $\Upsilon(10890)$ in the \ssbar, \cc and \bb share features that point to the possible role of $\pi$ exchange forces between flavoured mesons generating effects that can mimic hybrid mesons. The flavour dependence of these phenomena may help to resolve this question.
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