2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/203715We investigate the role of jet and shower parton broadening by the strong colour field in the $Δη$-$Δϕ$ correlation of high $p_T$ particles. When anisotropic momentum broadening ($Δp_z > Δp_T$) 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.Talk given at 20th Int. Conf. on Ultra-Relativistic Nucleus-Nucleus Collisions, Jaipur, India, Feb.4-10, 2008Nuclear Theorytext