Measurement of the cross-sec tion for the process $\gamma\gamma\to \mathrm{p\bar{p}}$ at $\sqrt{s_{\rm ee}} = 183-189\,$GeV at LEP

The OPAL Collaboration

doi:doi:10.1140/epjc/s2003-01171-y

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Particles and Fields

Eur. Phys. J. C 28, 45-54 (2003)
DOI: 10.1140/epjc/s2003-01171-y

Measurement of the cross-sec tion for the process $\gamma\gamma\to \mathrm{p\bar{p}}$ at $\sqrt{s_{\rm ee}} = 183-189\,$ GeV at LEP

The OPAL Collaboration

(Received: 22 July 2002 / Published online: 24 March 2003 )

Abstract
The exclusive production of proton-antiproton pairs in the collisions of two quasi-real photons has been studied using data taken at $\sqrt{s_{\rm ee}} = 183\,$ GeV and $189\,$ GeV with the OPAL detector at LEP. Results are presented for $\ensuremath{\mathrm{p\bar{p}}}$ invariant masses, W, in the range $2.15<W<3.95\,$ GeV. The cross-sec tion measurements are compared with previous data and with recent analytic calculations based on the quark-diquark model.