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T: Fachverband Teilchenphysik

T 19: Flavourphysik (Theorie) 2

T 19.5: Talk

Friday, March 2, 2012, 09:25–09:40, VG 3.102

Re-Analysis of Direct Searches for a Fourth Generation of Quarks at Tevatron — Heiko Lacker, •Geoffrey Herbert, Andreas Menzel, Fabian Spettel, and Peter Uwer — Institut fur Physik, Humboldt-Universitat zu Berlin

Direct searches undertaken by the CDF Collaboration at Tevatron have resulted in lower mass limits for a fourth generation of quarks. These searches have focused on looking for the production of Up type fourth generation quarks (t′), decaying into a light quark and a W boson. Whilst the search undertaken in 2011 required at least one b-tag, the search produced in 2010 did not set any b-tagging requirements. Both of these searches always assumed 100% branching ratio for the decay topology under study as well as contributions from only t′t' production. A Re-interpretation of these results was incorporated into a CKMfitter package allowing for Br values in agreement with CKM-element constraints as well as possible signal contamination from b′ contributions.