Lees, J. P. et al. (2010) Measurement of the γγ*→η_{c} transition form factor. Physical Review D, 81 (5). 052010. ISSN 1550-7998

We study the reaction e+e-→e+e-ηc, ηc→KSK±π∓ and obtain ηc mass and width values 2982.2±0.4±1.6  MeV/c2 and 31.7±1.2±0.8  MeV, respectively. We find Γ(ηc→γγ)B(ηc→KK̅ π)=0.374±0.009±0.031  keV, and measure the γγ*→ηc transition form factor in the momentum transfer range from 2 to 50  GeV2. The analysis is based on 469  fb-1 of integrated luminosity collected at PEP-II with the BABAR detector at e+e- center-of-mass energies near 10.6 GeV.

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