Two dynamical generated a_0 resonances by interactions between vector mesons

Abstract

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 K{bar{K}}-pi eta dynamically generated state, there is an a_0(1710) as a coupled channel dynamically generated state near K^*bar{K}^* threshold. The channels involved are rho phi ,K^*bar{K}^*,rho omega , Kbar{K},pi eta . This a_0 mainly decays to rho omega , pi eta and Kbar{K}. This pole is much tied to the coupled channel effect. If we turn off either rho phi or K^*bar{K}^*, the pole disappears. In addition, it is found that a_0(1450) may also be dynamically generated by rho omega interactions due to pi and eta exchange.