Journal Article10.1016/S0920-5632(03)90649-9
ηc(2980) formation in two-photon collisions at LEP energies
A. Oblakowska-Mucha,B. Muryn,G. Polok,T. Szumlak +3 more
- 01 Apr 2003
- Vol. 117, pp 695-697
TL;DR: In this paper, ηc(2980) production in γγ interactions has been detected via its decays into Ks0K±π∓, K+K−K+K+ K− and K+k−π+π−π− in the data taken with the DELPHI detector at LEP1 and LEP2 energies.
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Abstract: 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 cahnnels is Γγγ = 13.9 ± 2.0 9stat.) ± 1.4(syst.) ± 2.7 (BR) keV. No direct decay channel ηc → π+π−π+π− has been observed. An upper limit Γγγ < 3.8 keV at 95% confidence level has been evaluated for that decay mode.
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Formation of the ηc in two-photon collisions at LEP
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