Bonn 2010 – scientific programme

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T: Fachverband Teilchenphysik

T 19: Beyond the Standard Model (Theorie) III

T 19.7: Talk

Wednesday, March 17, 2010, 15:30–15:45, HG XIV

How much space is left for a new family? — •Otto Eberhardt and Alexander Lenz — Universität Regensburg

We analyse the contributions of a fourth quark family to flavor and electroweak observables.

First we have a look at the flavor constraints to a hypothetical 4× 4 CKM matrix. In particular we investigate the allowed parameter space due to measurements of CKM elements in tree-level decays and due to measurements of loop induced FCNC processes. The resulting parameter ranges contain an expected small mixing with the fourth family, but also large effects are not yet excluded, for example a sizeable contribution to the CP violating B_s-mixing phase. Finally, we examine the influence of electroweak observables.