Joint resummation for pion wave function and pion transition form factor

@article{Li2013JointRF,
  title={Joint resummation for pion wave function and pion transition form factor},
  author={Hsiang-nan Li and Yue Shen and Yu-Ming Wang},
  journal={Journal of High Energy Physics},
  year={2013},
  volume={2014},
  pages={1-32}
}
A bstractWe construct an evolution equation for the pion wave function in the kT factorization formalism, whose solution sums the mixed logarithm ln x ln kT to all orders, with x (kT) being a parton momentum fraction (transverse momentum). This joint resummation induces strong suppression of the pion wave function in the small x and large b regions, b being the impact parameter conjugate to kT, and improves the applicability of perturbative QCD to hard exclusive processes. The above effect is… 

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