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The heavy fourth generation of quarks that have sufficiently small mixingwith the three known SM families form hadrons. In the present work, wecalculate the masses and decay constants of mesons containing either bothquarks from the fourth generation or one from fourth family and the other fromknown third family SM quarks in the framework of the QCD sum rules. In thecalculations, we take into account two gluon condensate diagrams asnonperturbative contributions. The obtained results reduce to the known massesand decay constants of the $\bar b b$ and $\bar c c$ quarkonia when the fourthfamily quark is replaced by the bottom or charm quark.

Masses and decay constants of bound states containing fourth family quarks from QCD sum rules