QCD AND RESONANCE PHYSICS - RHO-OMEGA MIXING

被引:740
作者
SHIFMAN, MA
VAINSHTEIN, AI
ZAKHAROV, VI
机构
[1] Institute of Theoretical and Experimental Physics, Moscow
关键词
D O I
10.1016/0550-3213(79)90024-5
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
The QCD-based approach to the resonance physics proposed earlier is extended to cover the ρ{variant}-ω mixing problem. We consider a two-point function relevant to the problem taking account of non-perturbative contributions. It is shown that virtual photon exchanges alone cannot explain the observed value of the mixing parameter. The phenomenon gets a natural explanation if one assumes a large isotopic symmetry violation in the mechanical quark masses, (md - mu)/(md + mu) ∼ 0.3. This number is close to that resulting from the well-known pseudoscalar meson analysis. Unlike the latter, however, our result does not assume an exact SU(3)flavor symmetry in vacuum-to-vacuum matrix elements. © 1979.
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收藏
页码:519 / 534
页数:16
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