Top-spin analysis of new scalar and tensor interactions in e+ e- collisions with transverse beam polarization

The top polarization at the International Linear Collider (ILC) with transverse beam polarization is utilized in the e+e- → tt-bar process to probe interactions of the scalar and tensor type beyond the Standard Model and to disentangle their individual contributions. Confidence level limits of 90% are presented on the interactions with realistic integrated luminosity and are found to improve by an order of magnitude compared to the case when the spin of the top quark is not measured. Sensitivities of the order of a few times 10-3 TeV-2 for real and imaginary parts of both scalar and tensor couplings at √s = 500 and 800 GeV with an integrated luminosity of 500 fb-1 and completely polarized beams are shown to be possible. (author)