1110.1147 (Zhu-feng Zhang et al.)

Instanton Effects in QCD Sum Rules for the $0^{++}$ Hybrid    [PDF]

Zhu-feng Zhang, Qing Xu, Hong-ying Jin, T. G. Steele

In this paper, we study instanton contributions to the correlator of the
hybrid current $g\bar q \sigma_{\mu\nu}G^a_{\nu\mu}T^a q$. These contributions
are then included in a QCD sum-rule analysis of the isoscalar $0^{++}$ hybrid
mass. We find a mass at 1.83 GeV for the $(\bar uug+\bar ddg)/\sqrt{2}$ hybrid.
However, for the $\bar ssg$ hybrid, we find the sum rules are unstable. We also
study non-zero width effects, which affect the mass prediction. The mixing
effects between these two states are studied and we find QCD sum rules support
the existence of a flavor singlet hybrid with mass at around 1.9 GeV. Finally,
we study the mixing effects between hybrid and glueball currents. The mixing
between the $(\bar uug+\bar ddg)/\sqrt{2}$($\bar ssg$) and the glueball causes
two states, one in the region 1.4-1.8 GeV(1.4-2.2 GeV), and the other in the
range 1.8-2.2 GeV(2.2-2.6 GeV).

View original: http://arxiv.org/abs/1110.1147