Observation of exclusive ηc production in two photon interactions at TRISTAN
1998
Abstract We observe η c production in the two photon process e + e − → e + e − η c at an e + e − center-of-mass energy of 58 GeV. We determine the radiative decay width Γ γγ ( η c ) to be 27±16(sta)±10(sys) keV.
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