ηc puzzle in quantum chromodynamics

M. A. Shifman; A. I. Vainshtein; M. B. Voloshin; V. I. Zakharov

doi:10.1016/0370-2693(78)90206-X

η_c puzzle in quantum chromodynamics

M. A. Shifman, A. I. Vainshtein, M. B. Voloshin, V. I. Zakharov

Physics and Astronomy (Twin Cities)

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Abstract

The mass of the η_c 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 η_c 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" η_c. The η_c 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	https://doi.org/10.1016/0370-2693(78)90206-X
State	Published - Jul 17 1978

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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.",

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AU - Shifman, M. A.

AU - Vainshtein, A. I.

AU - Voloshin, M. B.

AU - Zakharov, V. I.

PY - 1978/7/17

Y1 - 1978/7/17

N2 - 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.

AB - 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.

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η_c puzzle in quantum chromodynamics

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