Experimental results of investigation of two-photon interactions at LEP (CERN) are presented Experimental conditions provided a possibility of investigation of the whole set of two-photon interactions from the production of lepton pairs in collisions of quasi-real photons to interactions of high-virtual photons

Two-photon interactions at LEP

We report measurements of charmonia produced in two-photon collisions and decaying to four-meson final states, where the meson is either a charged pion or a charged kaon. The analysis is based on a 395 fb-1 data sample accumulated with the Belle detector at the KEKB electron–positron collider. We observe signals for the three C-even charmonia ηc(1S), χc0(1P) and χc2(1P) in the π+π-π+π-, K+K-π+π- and K+K-K+K- decay modes. No clear signals for ηc(2S) production are found in these decay modes. We have also studied resonant structures in charmonium decays to two-body intermediate meson resonances. We report the products of the two-photon decay width and the branching fractions, $\Gamma_{\gamma\gamma}\mathcal{B}$, for each of the charmonium decay modes.

/pdf/study-of-charmonia-in-four-meson-final-states-produced-in-5d4v9weknp.pdf

Study of charmonia in four-meson final states produced in two-photon collisions

Glueballs, Hybrids, Multiquarks. Experimental facts versus QCD inspired concepts

eta_c(2980) production in gamma-gamma interactions has been detected via its decays into K0_s K+/- pi-/+, K+ K- K+ K- and K+ K- pi+ pi- 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 \Gamma_{\gamma\gamma} = 13.9 +/- 2.0 (stat.) +/- 1.4 (syst.) +/- 2.7 (BR) keV. No direct decay channel eta_c -> pi+ pi- pi+ pi- has been observed. An upper limit $\Gamma_{\gamma\gamma}$ < 5.5 keV at 95% confidence level has been evaluated for this decay mode.

The eta_c(2980) formation in two-photon collisions at LEP energies

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The eta_c(2980) formation in two-photon collisions at LEP energies