Search for New Physics Effects at a Linear Collider with Polarized Beams

Abstract

The four-fermion contact-interaction searches in the process $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}$ at a future $e^{+}{e}^{-}$ Linear Collider with c.m. energy $\sqrt{s}=0.5$ TeV and with both beams longitudinally polarized are studied. We evaluate the corresponding model-independent constraints on the coupling constants, emphasizing the role of beam polarization, and make a comparison with the case of Bhabha scattering.

10 pages with 1 figure and 1 table Presented at the International School-Seminar "The Actual Problems of Particle Physics", Gomel, August 7 -- 16, 2001