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

Abstract

We utilize top polarization in the process e+ e-\rightarrow t\bar{t} at the ILC with transverse beam polarization to probe interactions of the scalar and tensor type beyond the standard model and to disentangle their individual contributions. 90% confidence level limits on the interactions with realistic integrated luminosity are presented 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 \sqrt{s}=500 and 800 GeV with an integrated luminosity of 500 fb^{-1} and completely polarized beams is shown to be possible. A powerful model-independent framework for inclusive measurements is employed to describe the spin-momentum correlations and their C, P and T properties is presented in a technical appendix.

14 pages, 10 figures, uses revtex; replaced with version accepted for publication in Physical Review D; significantly rewritten and reformulated, section added, inclusive section moved to appendix, reference added

References in corpus (7)

• Lepton distribution as a probe of new physics in production and decay of the t quark and its polarization
• Transverse beam polarization and CP-violating triple-gauge-boson couplings in e+e- -> gamma Z
• CP violation at a linear collider with transverse polarization
• Probing CP-violating contact interactions in e+e- --> HZ with polarized beams
• New physics in e+ e- -> Z gamma with polarized beams
• Space-time structure of new physics with polarized beams at the linear collider
• Two-particle kinematic distributions from new physics at an electron-positron collider with polarized beams