Tests of the Noncommutative Standard Model at a Future Photon Collider A

Extensions of the Standard Model of elementary particle physics to noncommu-tative geometries are proposed by string models. Independent of this motivation, one may consider such a model as an effective field theory with higher-dimensional operators containing an antisymmetric rank-2 background field. We study the signals of such a Noncommutative Standard Model (NCSM) and analyze the discovery potential of fermion pair production at a future photon collider. The interest in noncommutative (NC) theories has been growing dramatically in recent years due to the observation that open string theories with constant antisymmetric rank-2 tensor fields can be interpreted as Yang-Mills theories living on a NC manifold 1. Independent from this motivation, NC Quantum Field Theory in itself provides an interesting approach in introducing a fundamental length scale and cutting off short-distance contributions, consistent with the symmetries of a given model. Recently, there has been a lot of effort in constructing an Effective Field Theory (EFT) which is defined on a NC spacetime with a canonical structure