A measurement of the cross section for γγ→pp¯ is performed at two-photon center-of-mass energies between 2.00 and 3.25 GeV. These results are obtained using ${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{-}}$→${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{-}}$pp¯ events selected from 1.31 ${\mathrm{fb}}^{\mathrm{-}1}$ of data taken with the CLEO II detector. The measured cross section is in reasonable agreement with previous measurements and is in excellent agreement with recent calculations based on a diquark model. However, leading order QCD calculations performed using the Brodsky-Lepage formalism are well below the measured cross section.

• Received 1 September 1993

DOI:https://doi.org/10.1103/PhysRevD.50.5484