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Bonn 2010 – scientific programme

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T: Fachverband Teilchenphysik

T 19: Beyond the Standard Model (Theorie) III

T 19.8: Talk

Wednesday, March 17, 2010, 15:45–16:00, HG XIV

Extra Fermion Generations and Flavour BoundsMarkus Bobrowski1, Alexander Lenz1, Johann Riedl1, and •Jürgen Rohrwild21Universität Regensburg — 2RWTH Aachen

In a sense the simplest way to venture beyond the boundaries of the (current) Standard Model is the inclusion of an additional generation of fermions.

As precision measurements of flavour physics observables are known to provide a window to new physics, one needs to study the effects of a fourth fermion generation on these observables.

We show how flavour physics imposes severe bounds on the parameters associated with the four fermion generation CKM matrix. However, we also find that—counterintuitively—large mixing effects cannot be excluded. This phenomenon arises if contributions due to the additional fermions are cancelled by the effects of the modified CKM structure.

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