Prof.
Heiko Lacker
(Humboldt Universität zu Berlin)
15/09/2009, 09:00
Current data do not exclude the existence of an additional sequential 4th generation of leptons and quarks. Such a natural extension of the standard model content has some interesting features: the possibility of gauge coupling unification without supersymmetry, a possible particular role of such particles in electroweak symmetry breaking and a sufficiently large amount of CP violation for...
Prof.
Tilman Plehn
(University of Edinburgh & MPI Muenchen)
15/09/2009, 10:05
Dr
Alexander Lenz
(Universität Regensburg)
15/09/2009, 10:35
We perform an exploratory study of the allowed parameter range for the CKM-like mixing of hypothetical quarks of a fourth generation. As experimental constraints we use the tree-level determinations of the 3X3 CKM elements and FCNC processes (K-, D-, B_d-, B_s-mixing and the decay b->s gamma) under the assumption that the 4X4 CKM-matrix is unitary. For the FCNCs we use some simplifying...
