Abstract
The mass of the ηc meson is calculated by means of QCD sum rules. If the spectrum of the 0- states of charmonium contains a single prominent resonance, like the J ψ in the case of vector states, then the ηc mass is 3.0 GeV, not 2.83. There is a possibility however that there are two mixed 0- states with close masses. Then the X(2.83) could be one of them. The other one however has a much larger coupling to the pseudoscalar current of c quarks and is a "true" ηc. The ηc mass in the case of two mixed states is 3.0-3.2 GeV.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 80-83 |
| Number of pages | 4 |
| Journal | Physics Letters B |
| Volume | 77 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jul 17 1978 |
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Shifman, M. A., Vainshtein, A. I., Voloshin, M. B., & Zakharov, V. I. (1978). ηc puzzle in quantum chromodynamics. Physics Letters B, 77(1), 80-83. https://doi.org/10.1016/0370-2693(78)90206-X