Pair Production of Neutral Higgs Bosons through Noncommutative QED Interactions at Linear Colliders

Based on a previous study on anomalous neutral pion-photon interactions in noncommutative (NC) QED, we argue that neutral particles should generally interact with photon if there is any generalization of the electroweak standard model (SM) to NC spacetime. In this work we investigate its implications on the pair production of neutral Higgs bosons at linear colliders. We find the following striking features of the process as compared to the SM result: (1) generally larger cross sections for an NC scale of order 1 TeV; (2) very different distributions in the polar and azimuthal angles; (3) day-night asymmetry due to the Earth's rotation; and (4) equal contributions from left- and right-handed initially polarized electrons. These will be very helpful in identifying NC signals at linear colliders once the Higgs boson has already been found in its main production channels