Speaker
Petra Van Mulders
(Vrije Universiteit Brussel)
Description
We present a search for fourth generation chiral quarks of the up- and down-type
in 7 TeV proton collisions recorded by the CMS experiment at the LHC. Final state
topologies with b' and t' quarks produced singly or in pairs are studied in the 2011
data corresponding to an integrated luminosity of 1.1 fb^{-1}. Degenerate masses are
assumed for the fourth generation quarks. The inclusive search is performed in the
decay channel where one isolated muon with a high transverse momentum is identified
and results in model dependent limits on the mass of the chiral quarks and the
relevant CKM4 matrix elements. For minimal off-diagonal mixing between the third
and the fourth generation, a limit m_{t'} > 490 GeV/c^{2} is obtained at 95% C.L.
Summary
A new inclusive search strategy is presented resulting in the most stringent limit to date on the mass of an up-type fourth generation quarks.
Author
Petra Van Mulders
(Vrije Universiteit Brussel)
