{pi}{ital NN} form factor from QCD sum rules

Journal Article · Fri Dec 01 04:00:00 EST 1995 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.52.3386· OSTI ID:132960

Meissner, T ^[1]

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1. Department of Physics and Astronomy, University of South Carolina, Columbia, South Carolina 29208 (United States)

QCD sum rules are used to calculate the {ital q}{sup 2} dependence of the {pi}{ital NN} coupling {ital g}{sub {pi}{ital NN}}({ital q}{sup 2}) in the spacelike region 0.5 GeV{sup 2}{approx_lt}{ital q}{sup 2}{approx_lt}1.5 GeV{sup 2}. We study the Borel sum rule for the three point function of one pseudo- scalar and two nucleon currents up to order 4 in the operator product expansion. The Borel transform is performed with respect to the nucleon momenta, whereas the momentum {ital q}{sup 2} of the pseudoscalar vertex is kept fixed at spacelike values. The results can be well fitted using a monopole form with a cutoff mass of about {Lambda}{sub {pi}}{approx}800 MeV.

• OSTI ID: 132960
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 6 Vol. 52; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COUPLING
FORM FACTORS
MOMENTUM TRANSFER
MONOPOLES
NUCLEONS
OPERATOR PRODUCT EXPANSION
PIONS
QUANTUM CHROMODYNAMICS
SUM RULES