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Triangle and other kinematic singularities are very sensitive to the precisemasses and widths of the intervening particles. Therefore, the effect that theheavy-ion collision medium can have on those masses and widths, as captured byfinite-temperature field theory and reported in the literature, may erase thesingularity from the spectrum if the effect is large enough and the loopcompletes before the hot gas freezes out. A very timely example is provided bythe $Z_{cs}(3985)$ structure recently reported by BES-III in a$(D_s^-D^{*0}+D_s^{*-}D^0)$ spectrum recoiling against a $K^+$. If a newhadron, this would be a clear exotic $c\bar{c}s\bar{u}$ tetraquark candidate,the first of a charmonium-like family with strangeness: to accept this,alternative explanations first need to be tested and discarded. As shown infigure 1, the mass spectrum recoiling against the kaon is near the$m_{D_s^{*-}}+m_{D^0}$ threshold, whereas the production cross-section seems topeak around that for $\sqrt{s(e^-e^+)}=m_{D_{s2}^{*+}} +m_{D_s^{*-}} $.Therefore, this structure may well be caused by a triangle with the threecharmed mesons $D_{s2}^{*+} / D_s^{*-} / D^0$ running in the loop, with theamplitude enhanced at the two thresholds. If so, the structure would be erasedfrom the spectrum in Heavy Ion Collisions, whereas a hadron would continue toexist although with a mass decreased by a few percent as computed by otherauthors.

The $Z_{cs}(3985)$ structure, if a triangle/kinematic singularity, would disappear when heated in Heavy Ion Collisons