%0 Journal Article %T An extension of the Kadomtsev-Petviashvili hierarchy and its Hamiltonian structures %A Chao-Zhong Wu %A Xu Zhou %J Physics %D 2015 %I arXiv %X In this note we consider a two-component extension of the Kadomtsev-Petviashvili (KP) hierarchy represented with two types of pseudo-differential operators, and construct its Hamiltonian structures by using the $R$-matrix formalism. %U http://arxiv.org/abs/1502.04787v1