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In the context of the Standard model with a fourth generation, we explore theallowed mass spectra in the fourth generation quark and lepton sectors asfunctions of the Higgs mass. Using the constraints from unitarity and obliqueparameters, we show that a heavy Higgs allows large mass splittings in thesesectors, opening up new decay channels involving W emission. A Higgs heavierthan $ \sim 800 GeV $ would in fact necessitate either a heavy quark decaychannel t'-> b'W/b'-> t' W or a heavy lepton decay channel \tau' -> \nu' W aslong as the mixing between the third and fourth generations is small. Thismixing tends to suppress the mass splittings and hence the W-emission channels.The possibility of the W-emission channel could substantially change the searchstrategies of fourth generation fermions at the LHC and impact the currentlyreported mass limits.

Large mass splittings for fourth generation fermions allowed by LHC Higgs exclusion