Pion form factor

Conference · Fri Apr 01 04:00:00 EST 1994

OSTI ID:232638

Ryong Ji, C; Pang, A; Szczepaniak, A ^[1]

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1. North Carolina State Univ., Raleigh, NC (United States)

It is pointed out that the correct criterion to define the legal PQCD contribution to the exclusive processes in the lightcone perturbative expansion should be based on the large off-shellness of the lightcone energy in the intermediate states. In the lightcone perturbative QCD calculation of the pion form factor, the authors find that the legal PQCD contribution defined by the lightcone energy cut saturates in the smaller Q{sup 2} region compared to that defined by the gluon four-momentum square cut. This is due to the contribution by the highly off-energy-shell gluons in the end point regions of the phase space, indicating that the gluon four-momentum-square cut may have cut too much to define the legal PQCD.

• Research Organization: Southeastern Universities Research Association, Inc., Newport News, VA (United States)
• DOE Contract Number: FG05-90ER40589; FG05-88ER40461
• OSTI ID: 232638
• Report Number(s): DOE/ER/40150--299; CONF-9404197--; CEBAF-R--95-001; ON: DE96001410
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
EXCLUSIVE INTERACTIONS
FORM FACTORS
PERTURBATION THEORY
PIONS
QUANTUM CHROMODYNAMICS