The size of chi = arg (-Vts Vtb* Vcs* Vcb) and physics beyond the Standard Model

Details The size of chi = arg (-Vts Vtb* Vcs* Vcb) and physics beyond the Standard Model The size of chi = arg (-Vts Vtb* Vcs* Vcb) and physics beyond the Standard Model

2004-06-14

arxiv.org/abs/hep-ph/0406151v2

Nucl.Phys.B706:204-220,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 19 pages, 6 PS figures. Section 3 expanded. Version to be published in NPB

Scientific paper

10.1016/j.nuclphysb.2004.11.024

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.

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