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Top-quark spin correlation at Linear Colliders with anomalous couplings | Z.-H. Lin
; T. Han
; T. Huang
; J.-X. Wang
; X. Zhang
; | Date: |
29 Jun 2001 | Journal: | Phys.Rev. D65 (2002) 014008 | Subject: | hep-ph | Affiliation: | BIHEP), T. Han (Wisconsin U., Madison), T. Huang (BIHEP), J.-X. Wang (BIHEP) and X. Zhang (BIHEP | Abstract: | We investigate the feasibility of probing anomalous top-quark couplings of $Wtb$, $Z t ar{t}$, and $gamma t ar{t}$ 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 $Z o b ar{b}$ data at LEP I and from unitarity considerations. We then consider in detail the effects of anomalous couplings on $t ar{t}$ 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. | Source: | arXiv, hep-ph/0106344 | Services: | Forum | Review | PDF | Favorites |
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