Summary: | 碩士 === 中原大學 === 應用物理研究所 === 93 === 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 $1 GeV$.
|