We investigate the ground-state heavy quarkonium χ c1 (1P ) and its first excited state χ c1 (2P ) with quantum numbers J P C = 1 ++ . The masses and decay constants of these charmonium states are computed using two-point QCD sum rule method by including quark, gluon and mixed condensates up to dimension-8. We compare our numerical results with the available experimental data as well as existing theoretical predictions in the literature.
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