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2012

Combined search for the quarks of a sequential fourth generation

CMS Collaboration

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Results are presented from a search for a fourth generation of quarks produced singly or in pairs in a data set corresponding to an integrated luminosity of 5 inverse femtobarns recorded by the CMS experiment at the LHC in 2011.

A novel strategy has been developed for a combined search for quarks of the up and down type in decay channels with at least one isolated muon or electron.
Limits on the mass of the fourth-generation quarks and the relevant Cabibbo-Kobayashi-Maskawa matrix elements are derived in the context of a simple extension of the standard model with a sequential fourth generation of fermions.
The existence of mass-degenerate fourth-generation quarks with masses below 685 GeV is excluded at 95% confidence level for minimal off-diagonal mixing between the third- and the fourth-generation quarks.

Combined search for the quarks of a sequential fourth generation · Around

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