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

TL;DR

This paper investigates instanton effects in QCD sum rules for the $0^{++}$ hybrid, predicting hybrid masses around 1.8-1.9 GeV and analyzing mixing with glueball states, contributing to understanding hybrid and glueball spectra.

Contribution

It introduces instanton contributions into QCD sum rules for $0^{++}$ hybrids and explores their mass predictions and mixing effects with glueballs, providing new insights into hybrid state properties.

Findings

Predicted hybrid mass at 1.83 GeV for non-strange states

Supported existence of a flavor singlet hybrid around 1.9 GeV

Identified mixing effects leading to multiple states in 1.4-2.6 GeV range

Abstract

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).