Two dynamical generated a_0 resonances by interactions between vector mesons

We study dynamically generated a_0 resonances by interactions between vector mesons including their coupling to channels of pseudoscalar mesons within coupled-channel approach. Both vector and pseudoscalar mesons are considered as t -channel exchanged mesons for calculating interactions between vector mesons. Analogous to a_0(980) as a KK̅-πη dynamically generated state, there is an a_0(1710) as a coupled channel dynamically generated state near K^*K̅^* threshold. The channels involved are ρϕ ,K^*K̅^*,ρω , KK̅,πη . This a_0 mainly decays to ρω , πη and KK̅ . This pole is much tied to the coupled channel effect. If we turn off either ρϕ or K^*K̅^* , the pole disappears. In addition, it is found that a_0(1450) may also be dynamically generated by ρω interactions due to π and η exchange.