Effects of mixing with quark singlets

Details Effects of mixing with quark singlets Effects of mixing with quark singlets

2002-10-07

arxiv.org/abs/hep-ph/0210112v4

Phys.Rev. D67 (2003) 035003; Erratum-ibid. D69 (2004) 099901

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 59 pages, 11 PS figures. Corrected the results for the CP asymmetry in Bs -> Ds+ Ds- and several typos

Scientific paper

10.1103/PhysRevD.67.035003

The mixing of the known quarks with new heavy singlets can modify significantly some observables with respect to the Standard Model predictions. We analyse the range of deviations permitted by the constraints from precision electroweak data and flavour-changing neutral processes at low energies. We study top charged current and neutral current couplings, which will be directly tested at top factories, like LHC and TESLA. We discuss some examples of observables from K and B physics, as the branching ratio of K_L -> pi^0 nu nu, the B^0_s mass difference or the time-dependent CP asymmetry in B_s^0 -> D_s^+ D_s^-, which can also show large new effects.

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