Hard Exclusive Baryon-Antibaryon Production in Two-Photon Collisions

Details Hard Exclusive Baryon-Antibaryon Production in Two-Photon Collisions Hard Exclusive Baryon-Antibaryon Production in Two-Photon Collisions

2002-12-04

arxiv.org/abs/hep-ph/0212066v3

Eur.Phys.J. C28 (2003) 249-259

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 7 figures, 4 tables, needs svjour2.cls (included); minor latex errors corrected

Scientific paper

10.1140/epjc/s2003-01166-8

We study baryon pair production in two-photon collisions, gamma gamma -> B Bbar, within perturbative quantum chromodynamics, treating baryons as quark-diquark systems. We extend previous work within the same approach by treating constituent-mass effects systematically by means of an expansion in the small parameter (mass/photon energy). Our approach enables us to give a consistent description of the cross sections for all octet baryon channels. Adopting the model parameters from foregoing work, we are able to reproduce the most recent large-momentum-transfer data from LEP for the p pbar, Lambda Lambdabar, and Sigma^0 Sigma^0bar channels in a quite satisfactory way. We also briefly address the crossed process for the proton channel, gamma p -> gamma p.

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