Signals for noncommutative interactions at linear colliders - art. no. 075012

Recent theoretical results have demonstrated that noncommutative geometries naturally appear within the context of string or M theory. One consequence of this possibility is that QED takes on a non-Abelian nature due to the i ntroduction of 3- and 4-point functions. In addition, each QED vertex acqui res a momentum dependent phase factor. We parametrize the effects of noncom mutative space-time coordinates and show that they lead to observable signa tures in several 2 -->2 QED processes in e(+)e(-) collisions. In particular , we examine pair annihilation, Moller and Bhabha scattering, as well as ga mma gamma --> gamma gamma scattering and show that noncommutative scales of order a TeV can be probed at high energy linear colliders.