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The size of chi = arg (-Vts Vtb* Vcs* Vcb) and physics beyond the Standard Model | | J. A. Aguilar-Saavedra
; F.J. Botella
; G. C. Branco
; M. Nebot
; | | Date: |
14 Jun 2004 | | Journal: | Nucl.Phys. B706 (2005) 204-220 DOI: 10.1016/j.nuclphysb.2004.11.024 | | Subject: | hep-ph | | Abstract: | We analyse the allowed range of values of chi, both in the Standard Model and in models with New Physics, pointing out that a relatively large value of chi, e.g. of order lambda, is only possible in models where the unitarity of the 3x3 Cabibbo-Kobayashi-Maskawa matrix is violated through the introduction of extra Q=2/3 quarks. We study the interesting case where the extra quark is an isosinglet, determining the allowed range for chi and the effect of a large chi on various low-energy observables, such as CP asymmetries in B meson decays. We also discuss the correlated effects which would be observable at high energy colliders, like decays t -> cZ, modifications of the cross section and forward-backward asymmetry in e+ e- -> ttbar and the direct production of a new quark. | | Source: | arXiv, hep-ph/0406151 | | Services: | Forum | Review | PDF | Favorites | |
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