By directly applying light-front boosts to model wave functions, we calculate the soft parts as well as the hard parts of exclusive processes. In the model used by Isgur and Llewellyn Smith, the asymptotic terms begin to dominate for Qc²{}3.5 (GeV/c)² for the pion charge form factor, a much smaller value than previously reported.
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Jacob et al. (1986) studied this question.
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