Understand
The k_T-factorization has been widely used for exclusive decays of B-mesons.
- In this factorization the pertubative coefficients are extracted from scattering of off-shell partons.
- Because the off-shellness of partons the extracted pertubative coefficients in general are not gauge-invariant.
- We show that these perturbative coefficients contain gauge-dependent singularities beyond tree-level.
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