We investigate the role of jet and shower parton broadening by the strong colour field in the $Deltaeta$-$Deltaphi$ correlation of high $p_T$ particles. When anisotropic momentum broadening ($Delta p_z > Delta p_T$) is given to jet and shower partons
in the initial stage, a ridge-like structure is found to appear in the two hadron correlation. The ratio of the peak to the pedestal yield is overestimated.
