Conformal Symmetry and Pion Form Factor: Space- and Time-like Region
  We extend a recent analysis of the pion electromagnetic form factor constrained by the conformal symmetry to explore the time-like region. We show explicitly that the time-like form factor obtained by the analytic continuation of the space-like form factor correctly satisfies the dispersion relation. Our results indicate that the quark spin and dynamical mass effects are crucial to yield the realistic features of the vector meson dominance phenomena. 
Ho-Meoyng Choi and Chueng-Ryong Ji