Exotic four quark matter: Z1(4475)

Motivated by the LHCb's recent confirmation of Z(1)(4475) as the J(P) = 1(+) resonance, we investigate various exotic interpretations of Z(1)(4475), which may be an axial vector tetraquark state, the P-wave excitation of the S-wave D-1(D) over bar* or D-2(D) over bar* molecule, the S-wave molecule composed of a D or D* meson and a D-wave vector D meson, or the cousin molecular state of Z(c)(3900) and Z(c)(4020) composed of a D or D* meson and their radial excitations. With the help of the heavy quark symmetry, we predict the typical radiative and hidden-charm and open-charm strong decay patterns of Z(1)(4475), which are crucial to further identify the molecular state assignment of Z(1)(4475).