Speaker
Roman Poeschl
(Universite de Paris-Sud 11 (FR))
Description
Top quark production in the process e+e- -> ttbar at a future linear electron
positron collider with polarised beams is a powerful tool to determine the
scale of new physics. The presented study assumes a centre-of-mass energy of
500 GeV and an integrated luminosity of 500 fb-1 equally shared between the
incoming beam polarisations of (Pe+, Pe-) = (+/-0.8,-/+0.3). Events are
selected in which the top pair decays semi-leptonically. The study comprises
the cross sections, the forward-backward asymmetry and the slope of the
helicity angle asymmetry. The vector, axial vector and tensorial CP conserving
couplings are separately determined for the photon and the Z^0 component. The
sensitivity to new physics would be dramatically improved with respect to that
expected from the LHC for electroweak couplings.
Author
Roman Poeschl
(Universite de Paris-Sud 11 (FR))
