2003/11/01 by The DELPHI Collaboration, J. Abdallah · 1 citation
Medicine · Physics and Astronomy · #Medical Imaging Techniques and Applications #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.1140/epjc/s2003-01384-0
published as Eur.Phys.J.C31:481-489,2003 · 15 pages, 6 figures, Accepted by Eur. Phys. J. C
arxiv created 2003/11/01 · openalex publication_date 2003/12/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04
etac(2980) production in gamma-gamma interactions has been detected via its decays into K0s 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 Γγγ = 13.9 +/- 2.0 (stat.) +/- 1.4 (syst.) +/- 2.7 (BR) keV. No direct decay channel etac -> pi+ pi- pi+ pi- has been observed. An upper limit Γγγ < 5.5 keV at 95% confidence level has been evaluated for this decay mode.