Nuclear Broadening of Out-of-Plane Transverse Momentum in Di-Jet Production

Abstract

Recently claimed \cite{dj1,dj2,FC} anomalous nuclear effects in di-jet production are analyzed in view of multiple interaction of projectile/ejectile partons in nuclear matter. We derive model--independent relations between A-dependence of the cross section and nuclear broadening of transverse momentum. Comparison with the data show that initial/final state interaction of partons participating in hard process is hard as well. This is a solid argument in favor of smallness of a color neutralization radius of a hadronizing highly virtual quark.

Comments: 6 pages, Talk presented at the 5th Conference on the Intersection of Particle and Nuclear Physics, St. Petersburg, Florida, 1994