Electroweak Precision Observables within a Fourth Generation Model with General Flavour Structure

Details Electroweak Precision Observables within a Fourth Generation Model with General Flavour Structure Electroweak Precision Observables within a Fourth Generation Model with General Flavour Structure

2011-05-17

arxiv.org/abs/1105.3434v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Scientific paper

We calculate the contributions to electroweak precision observables (EWPOs) due to a fourth generation of fermions with the most general (quark-) flavour structure (but assuming Dirac neutrinos and a trivial flavour structure in the lepton sector). We discuss the size of non-oblique contributions arising from Z--quark--anti-quark vertex corrections and the dependence of the EWPOs on all CKM mixing angles involving the fourth generation. We find that the electroweak precision observables are equally sensitive to all three fourth-generation mixing angles and that the corresponding constraints on these angles are competitive with those obtained from flavour physics. For non-trivial 4x4 flavour structures, the non-oblique contributions lead to relative corrections at the permille level and may well have a noticable effect in a global fit.

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