Bonn 2010 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 19: Beyond the Standard Model (Theorie) III

T 19.8: Vortrag

Mittwoch, 17. März 2010, 15:45–16:00, HG XIV

Extra Fermion Generations and Flavour Bounds — Markus Bobrowski¹, Alexander Lenz¹, Johann Riedl¹, and •Jürgen Rohrwild² — ¹Universität 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.