Precision Electroweak Tests on the $Sp(6)_L \times U(1)_Y$ Model
  We perform precision electroweak tests on the $Sp(6)_L \times U(1)_Y$ model. The purpose of the analysis is to delineate the model parameters such as the mixing angles of the extra gauge bosons present in this model. We find that the model is already constrained considerably by the present LEP data. 
T. K. Kuo and Gye T. Park