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The size of X arg(-V-ts V-tb(*) V-cs(*) V-cb) and physics beyond the standard model
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The size of X arg(-V-ts V-tb(*) V-cs(*) V-cb) and physics beyond the standard model
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| Aguilar Saavedra, Juan Antonio; Botella Olcina, Francisco J.; Branco, Gustavo Castelo; Nebot Gómez, Miguel | |||
| Aquest document és un/a article, creat/da en: 2005 | |||
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| 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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