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Could the near-threshold $XYZ$ states be simply kinematic effects? · Around

2014

Could the near-threshold $XYZ$ states be simply kinematic effects?

Guo, Feng-Kun, Hanhart, Christoph, Wang, Qian et al.

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We demonstrate that the spectacular structures discovered recently in various experiments and named as $X$, $Y$ and $Z$ states cannot be purely kinematic effects.

Their existence necessarily calls for nearby poles in the $S$--matrix and they therefore qualify as states.
We propose a way to distinguishing kinematic cusp effects from genuine $S$--matrix poles: the kinematic threshold cusp cannot produce a narrow peak in the invariant mass distribution in the elastic channel in contrast with a genuine $S$--matrix pole.

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