Light-cone view on the applicability of perturbative QCD for exclusive processes
- Department of Physics, North Carolina State University, Raleigh, North Carolina 27695 (United States)
It is pointed out in the example of the pion form factor that the usual factorized hard scattering amplitude {ital T}{sub {ital H}} in perturbative QCD is derived from the light-cone time-ordered perturbative expansion. In the light-cone perturbative expansion, the natural variable to make a separation of perturbative contributions from contributions intrinsic to the bound-state wave function itself is the light-cone energy, rather than the gluon virtuality of {ital T}{sub {ital H}}. We find that the ``legal`` PQCD contribution defined by the light-cone energy cut saturates to the full PQCD prediction without any cut in the smaller {ital Q}{sup 2} region as compared to that defined by the gluon four-momentum square cut. This is due to the contribution from highly off-energy-shell gluons in the end-point regions of the phase space.
- DOE Contract Number:
- FG05-90ER40589
- OSTI ID:
- 249537
- Journal Information:
- Physical Review, D, Journal Name: Physical Review, D Journal Issue: 7 Vol. 52; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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