Catalytic Reactions in Heavy-ion Collisions
  We discuss a new type of reactions of a phi meson production on hyperons, pi Y--> phi Y and anti-kaons bar-K N --> phi Y. These reactions are not suppressed according to Okubo-Zweig-Iizuka rule and can be a new efficient source of phi mesons in a nucleus-nucleus collision. We discuss how these reactions can affect the centrality dependence and the rapidity distributions of the phi yield. 
E.E. Kolomeitsev and B. Tomasik (Matej Bel University, Czech Technical   University in Prague)
nucl-th