Spin effects in the pion holographic light-front wavefunction
  We account for dynamical spin effects in the holographic light-front wavefunction of the pion in order to predict its mean charge radius, decay constant, spacelike electromagnetic form factor, twist-2 Distribution Amplitude and the photon-to-pion transition form factor. Using a universal fundamental AdS/QCD scale of 523 MeV and a constituent quark mass of 330 MeV, we find a remarkable improvement in describing all observables. 
Mohammad Ahmady, Farrukh Chishtie and Ruben Sandapen
hep-ph