在夸克模型中,唯有夸克-反夸克對才可以組成一個介子。然則若用量子色動力學來描述,介子的組成可能性將不僅如此,例如,包含一個膠子的雜介子是有可能存在的,而其量子數也跳脫出夸克模型的限制。本文運用量子色動力學求和定理,求得量子數為1-+之雜介子基態質量的範圍為(1.35±0.25)GeV。並且求得量子數為0++之介子質量範圍,應為1GeV 左右。
We use the QCD sum rules approach to investigate the mass of the $J^{PC}=1^{-+}$ hybrid meson. After calculating the current-current correlator of the hybrid current $J_mu =overline{q}gamma_ u igG_{mu u}t^aq$, and using OPE expansion, we obtain the spectral function $Pi_{v,s}(q^2)$. We then get the QCD sum rules after applying the Borel transform to the spectral function. In this research, we also consider the next-to-leading order $alpha_s$-corrections in calculation. Finally, we find that the mass of the $J^{PC}=1^{-+}$ hybrid meson is $(1.35pm0.25) GeV$, and the mass of the $0^{++}$ meson may be of order $1 GeV$.