Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-06-27
Eur.Phys.J.C26:567-577,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
20 pages latex, 4 figures. v2: minor clarifications, references updated
Scientific paper
10.1140/epjc/s2002-01075-4
We study the handbag contribution to two-photon annihilation into baryon-antibaryon pairs at large energy and momentum transfer. We derive factorization of the process amplitude into a hard gamma gamma -> q qbar subprocess and form factors describing the soft q qbar -> B Bbar transition, assuming that the process is dominated by configurations where the (anti)quark approximately carries the full momentum of the (anti)baryon. The form factors represent moments of time-like generalized parton distributions, so-called B Bbar distribution amplitudes. A characteristic feature of the handbag mechanism is the absence of isospin-two components in the final state, which in combination with flavor symmetry provides relations among the form factors for the members of the lowest-lying baryon octet. Assuming dominance of the handbag contribution, we can describe current experimental data with form factors of plausible size, and predict the cross sections of presently unmeasured B Bbar channels.
Diehl Markus
Kroll Peter
Vogt Carsten
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