Measurement of the Cross-Section for the Process GammaGamma -> Ppbar at sqrt(s)_ee=183-189 GeV at LEP
The OPAL collaboration, G. Abbiendi, et al
TL;DR
This paper measures the cross-section of proton-antiproton pair production in photon-photon collisions at LEP energies, comparing results with previous data and quark-diquark model calculations.
Contribution
It provides new experimental cross-section data for gamma-gamma to proton-antiproton processes at 183-189 GeV, and compares these with theoretical models.
Findings
Cross-section measurements in the 2.15-3.95 GeV mass range.
Agreement with some theoretical predictions.
Enhanced understanding of photon-induced baryon production.
Abstract
The exclusive production of proton-antiproton pairs in the collisions of two quasi-real photons had been studied using data taken at sqrt(s)_ee=183 GeV and 189 GeV with the OPAL detector at LEP. Results are presented for Ppbar 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.
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