The ηc(2980) formation in two-photon collisions at LEP energies
- ηc(2980) production in γγ interactions has been detected via its decays into Ks0K±π ∓, K+K-K+K- and K +K-π+π- in the data taken with the DELPHI detector at LEP1 and LEP2 energies. The two-photon radiative width averaged over all observed decay channels is Γγγ = 13.9 ± 2.0 (stat.) ± 1.4(syst.) ± 2.7 (BR) keV. No direct decay channel ηc → π+π -π+π- has been observed. An upper limit Γγγ < 5.5 keV at 95% confidence level has been evaluated for this decay mode.
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