Göttingen 2012 – scientific programme

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T: Fachverband Teilchenphysik

T 19: Flavourphysik (Theorie) 2

T 19.8: Group Report

Friday, March 2, 2012, 10:10–10:30, VG 3.102

Can a fourth fermion family be ruled out? — •Otto Eberhardt¹, Geoffrey Herbert², Heiko Lacker², Alexander Lenz³, Andreas Menzel², Ulrich Nierste¹, and Martin Wiebusch¹ — ¹KIT — ²HU Berlin — ³CERN

It seems to be common belief that a sequential fourth generation of Standard-Model-like fermions (SM4) is already ruled out or at least disfavoured. We show that a consistent analysis has to take care of several loopholes, and that the full parameter space has not been excluded yet. In this analysis, we combine the recent results from LHC with electroweak precision observables and flavour bounds in a global fit of the SM4 parameters using CKMfitter.