Possible existence of extra SM families and/or isosinglet E6 quarks may sufficiently decrease |Vtb| of CKM matrix so that toponia can be formed. Production of pseudoscalar toponium at the LHC and VLHC has been considered. The observability of \ \eta t\rightarrow \gamma \gamma signal is discussed.
PACS numbers: 14.65.Ha, 13.85.Rm
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