Measurement of the cross-section for the process γγ→pp¯ at √see=183−189GeV at LEP

UNSPECIFIED (2003) Measurement of the cross-section for the process γγ→pp¯ at √see=183−189GeV at LEP. European Physical Journal C: Particles and Fields, 28 (1). pp. 45-54. ISSN 1434-6044

Abstract

The exclusive production of proton-antiproton pairs in the collisions of two quasi-real photons has been studied using data taken at √see = 183 GeV and 189 GeV with the OPAL detector at LEP. Results are presented for pp¯ invariant masses, W, in the range 2.15 <W < 3.95 GeV. The cross-section measurements are compared with previous data and with recent analytic calculations based on the quark-diquark model.