Dynamical spin effects within the pseudo scalar nonet within holographic QCD

We investigate the importance of dynamical spin effects in the holographic light-front wavefunctions of the pseudoscalar mesons. We find that these effects are crucial to describe the pion data while they are not necessary to describe the available kaon data. For $\eta-\eta^\prime$ system, we find that dynamical spin effects are required to describe their transition form factors data.