Nonperturbative explanation of the enhancement factors in the QCD sum rule for the {rho} meson

Journal Article · Fri Aug 01 04:00:00 EDT 1997 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.56.1489· OSTI ID:527115

Nie, S ^[1]; Kuang, Y; Wang, Q; Yi, Y ^[2]

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1. Department of Physics, Tsinghua University, Beijing 100084 (China)
2. China Center of Advanced Science and Technology (World Laboratory), P.O. Box 8730, Beijing 100080 (China)

Taking the sum rule for the {rho} meson as an example, we study the possibility of explaining the phenomenological enhancement factors for certain terms in the vacuum expectation value of operator product expansion in the QCD sum rule. We take a QCD motivated extended Nambu{endash}Jona-Lasinio model as the low energy effective Lagrangian for QCD with which we calculate the nonperpturbative contributions to the vaccum condensate expansion to obtain the enhancement factors. Our result shows that such nonperturbative contributions can cause large enough enhancement factors which can be consistent with the phenomenological values. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 527115
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 3 Vol. 56; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BAG MODEL
CONDENSATES
EXPECTATION VALUE
LAGRANGIAN FIELD THEORY
LAGRANGIAN FUNCTION
OPERATOR PRODUCT EXPANSION
QUANTUM CHROMODYNAMICS
RHO-770 MESONS
SUM RULES
VACUUM STATES