  We have investigated low energy excitations of a disk of electrons in
half-filled Landau level using trail wave function and small-size exact
diagonalization approaches. We have constructed a set of many-body basis states
that describe correctly the low energy excitations. In this theory a droplet
consists of two types of composite fermion liquids, and suggests that a droplet
can support an edge magnetoplasmon and low energy droplet excitations. A
possibility of measuring these excitations in a quantum dot is discussed.
