Regular Article - Theoretical Physics
Revisit assignments of the new excited states with QCD sum rules
Department of Physics, North China Electric Power University, Baoding, 071003, People’s Republic of China
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Accepted: 22 November 2017
Published online: 6 December 2017
In this article, we distinguish the contributions of the positive parity and negative parity states, study the masses and pole residues of the 1S, 1P, 2S and 2P states with the spin and using the QCD sum rules in a consistent way, and we revisit the assignments of the new narrow excited states. The predictions support assigning to the 1P state with , assigning to the 1P state with or the 2S state with , and assigning to the 2S state with .
© The Author(s), 2017