Harish-Chandra homomorphisms and symplectic reflection algebras for   wreath-products
  The main result of the paper is a natural construction of the spherical subalgebra in a symplectic reflection algebra associated with a wreath-product in terms of quantum hamiltonian reduction of an algebra of differential operators on a representation space of an extended Dynkin quiver. The existence of such a construction has been conjectured in [EG].   We also present a new approach to reflection functors and shift functors for generalized preprojective algebras and symplectic reflection algebras associated with wreath-products. 
Pavel Etingof, Wee Liang Gan, Victor Ginzburg, Alexei Oblomkov