Top-quark spin correlation at Linear Colliders with anomalous couplings

Details Top-quark spin correlation at Linear Colliders with anomalous couplings Top-quark spin correlation at Linear Colliders with anomalous couplings

2001-06-29

arxiv.org/abs/hep-ph/0106344v2

Phys.Rev. D65 (2002) 014008

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, 10 figures, references added

Scientific paper

10.1103/PhysRevD.65.014008

We investigate the feasibility of probing anomalous top-quark couplings of $Wtb$, $Z t \bar{t}$, and $\gamma t \bar{t}$ in terms of an effective Lagrangian with dimension-six operators at future $e^+e^-$ linear colliders with a c. m. energy $\sqrt s \sim 500-800$ GeV. We first examine the constraints on these anomalous couplings from the $Z\to b \bar{b}$ data at LEP I and from unitarity considerations. We then consider in detail the effects of anomalous couplings on $t \bar{t}$ spin correlations in the top-pair production and decay with three spin bases: the helicity, beamline and off-diagonal bases. Our results show that the polarized beams are more suitable for exploring the effects of different new operators. For polarized beams, the helicity basis yields the best sensitivity.

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