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

✍ Scribed by A. Oblakowska-Mucha; B. Muryn; G. Polok; T. Szumlak

Publisher: Elsevier Science
Year: 2003
Tongue: English
Weight: 549 KB
Volume: 117
Category: Article
ISSN: 0920-5632
DOI: 10.1016/s0920-5632(03)90649-9

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✦ Synopsis

ηc(2980) production in γγ interactions has been detected via its decays into K 0 s K ± 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 < 3.8 keV at 95% confidence level has been evaluated for that decay mode.

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