A Search for ${\eta }_c^{\prime }$ Production in Photon-Photon Fusion at LEP

Abstract

A search for the production of the ${\eta }_c^{\prime }$ meson, the first radial excitation of the ground state of charmonium ${\eta }_c$(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 ${\eta }_c^{\prime }$ production is found in the mass region 3520--3800 MeV/c^2. An upper limit for the ratio of the two-photon widths of the ${\eta }_c^{\prime }$ and ${\eta }_c$ is obtained.

13 pages