Seventh Order Glueball Mass of the 2+1-D SU(2)LGT in RPA

The random phase approximation (RPA) method and the Feymann-Hellman theorem are used to calculate the seventh order glueball mass of the 2+1-D SU(2) lattice gauge theory. As an approximation, the trial wave function is constructed only by single-hollow graphs. The calculated result of the seventh order glueball mass shows good scaling behavior at the weak coupling region of 1/g²=1.0-1.8(m/e²≈1.20±0.01).