A high precision study of the process has been performed using a data sample of 89 fb−1 collected with the Belle detector at the KEKB collider. The cross section of production has been measured at two-photon center-of-mass (c.m.) energies between 2.025 and 4.0 GeV and in the c.m. angular range of . Production of is observed and the product of the two-photon width of the and its branching ratio to is determined.