A Search for eta-prime(c) production in photon-photon fusion at LEP

Abreu, P.;Cortina Gil, Eduardo;DELPHI Collaboration;et.al.
(1998) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 441, n° 1-4, p. 479-490 (1998)

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Abstract
A search for the production of the η′c meson, the first radial excitation of the ground state of charmonium ηc(2980), in the photon–photon fusion reaction at LEP has been performed using the data collected by the DELPHI detector during 1992–1996. No evidence of η′c production is found in the mass region 3520–3800 MeV/c2. An upper limit for the ratio of the two-photon widths of the η′c and ηc is obtained.
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Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (1998). A Search for eta-prime(c) production in photon-photon fusion at LEP. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 441(1-4), 479-490. https://doi.org/10.1016/S0370-2693(98)01300-8 (Original work published 1998)