A search for ▫$\eta_c^`$▫ production in photon-photon fusion at LEP
Abreu, P. ...
A search for the production of the ([eta][sub]c)[sup]` meson, the first radial excitation of the ground state of charmonium [eta][sub]c(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 ([eta][sub]c)[sup]` production is found in the mass region 3520-3800 MeV/c[sup]2. An upper limit for the ratio of the two-photon widths of the ([eta][sub]c)[sup]` and [eta][sub]c is obtained.
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