Heating triangle singularities in heavy ion collisions

We predict that triangle singularities of hadron spectroscopy can be strongly affected in heavy ion collisions. To do it we examine various effects on the singularity-inducing loop finite temperature terminal phase. It appears peaks seen central collisions are more likely to hadrons than rescattering under two conditions. First, flight-time intermediate state must comparable lifetime equilibrated fireball (else, reaction mostly happens vacuo after freeze out). Second, medium effect over triangle-loop particle mass or width sizeable. When these (easily checked) conditions met, quickly reduces singularity: at T about 150 MeV, even by orders magnitude, acting then as a spectroscopic filter.