Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-03-25
Phys.Rev. D56 (1997) 1489-1495
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages in RevTex with 5 figures
Scientific paper
10.1103/PhysRevD.56.1489
Taking the sum rule for the rho meson as an example, we study the possibility of explaining the phenomenological enhamcement factors for certain terms in the vacuum expectation value of the operator product expansion in the QCD sum rule. We take a QCD motivated extended Nambu-Jona-Lasinio (ENJL) model as the low energy effective Lagrangian for QCD with which we calculate the nonperturbative contributions to the vacuum 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.
Kuang Yu-Ping
Nie Shu-Quan
Wang Qing
Yi Yu-Ping
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