Properties of bound states containing fourth family quarks
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KünyeBashiry, V., Azizi, K., & Sultansoy, S. F. (2012). Properties of bound states containing fourth family quarks. Journal of Physics: Conference Series, 347(1), 1-10. http://dx.doi.org/10.1088/1742-6596/347/1/012027
The heavy fourth generation of quarks that have sufficiently small mixing with the three known SM families form hadrons. In the present work, we calculate the masses and decay constants of mesons containing either both quarks from the fourth generation or one from fourth family and the other from observed SM quarks, namely charm or bottom quark, in the framework of the QCD sum rules. In the calculations, the two gluon condensate diagrams as nonperturbative contributions are taken into account. The obtained numerical results are reduced to the known masses and decay constants of the b̄b and c̄c quarkonia, when the fourth family quark is replaced by the bottom or charm quark.