Abstract : 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.
Type de document :
Article dans une revue
European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2003, 31, pp.481-489
http://hal.in2p3.fr/in2p3-00021588
Contributeur : Sylvie Flores
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Soumis le : lundi 15 décembre 2003 - 08:44:54
Dernière modification le : lundi 9 avril 2018 - 12:22:02
Document(s) archivé(s) le : mardi 30 mars 2010 - 18:26:22
J. Abdallah, P. Abreu, W. Adam, P. Adzic, T. Albrecht, et al.. The $\eta_c$(2980) formation in two-photon collisions at LEP energies. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2003, 31, pp.481-489. 〈in2p3-00021588〉
