par Abdallah, Jalal Mohamad J.;Wickens, John H. 
;Alderweireld, Thomas;Bertrand, Daniel ;D'Hondt, Jorgen;De Clercq, Catherine;Lemonne, Jacques ;Van Lysebetten, Ann;Van Remortel, Nick;Verbeure, F; [et al.]
Référence European Physical Journal C. Particles and Fields, 31, 4, page (481-489)
Publication Publié, 2003-12
;Alderweireld, Thomas;Bertrand, Daniel ;D'Hondt, Jorgen;De Clercq, Catherine;Lemonne, Jacques ;Van Lysebetten, Ann;Van Remortel, Nick;Verbeure, F; [et al.]Référence European Physical Journal C. Particles and Fields, 31, 4, page (481-489)
Publication Publié, 2003-12
Article révisé par les pairs
| Résumé : | ηc(2980) production in γγ interactions has been detected via its decays into Ks 0K±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. |
