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We have recently observed that hadron triangle singularities, that can mocknew exotic hadrons, can be significanttly suppressed in relativistic heavy ioncollisions, provided two conditions are met: these are, first, that thefireball lives long enough so that the triangle process has enough time tocomplete in the Norton-Coleman classical sense, and second, that the massand/or width of the particles in the triangle diagram are sufficiently modifiedfrom their vacuum values. Here we add a very interesting example to the canon,which is $Y(4260) \to D_1 D \to \pi D^* D \to \pi + J/\psi \pi$. This reactionhas been proposed as a mechanism to explain the appearance of $Z_c(3900)$ inthe $J/\psi \pi$ spectrum. If the two muons and two pions reconstructing theinitial-state $Y$ can be isolated from the combinatorial background, then themechanism can provide a spectroscopy test: presence of $Y(4260)$ but absence of$Z_c(3900)$ would be more indicative of such triangle mechanism, while presenceof both would rather point out to $Z_c$ being an exotic hadron.

Triangle singularities waning in Heavy Ion Collisions: the case of $Y(4260)\to \pi (\pi J/\psi)$