Y(3940)

Belle,	Phys. Rev. Lett. 94, 182002 (2005)
	e⁺ e^- → Y(3940) K Y(3940) → omega J/psi

In the following we study the behaviour
of the pole in the scattering amplitude,
for the 1^st radial excitation in J^P=0⁺,
under continously changing the flavor mass.