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HK: Fachverband Hadronen und Kerne
HK 46: Hadron Structure and Spectroscopy I
HK 46.5: Talk
Wednesday, March 18, 2009, 15:15–15:30, H-ZO 20
Kaon photo- and electroproduction in a Regge-plus-resonance approach — •Pieter Vancraeyveld, Lesley De Cruz, Jan Ryckebusch, and Tim Van Cauteren — Department of Subatomic and Radiation Physics, Ghent University, Belgium
We present an effective-Lagrangian model describing electromagnetic production of K+Λ [1], K+Σ0 and K0Σ+ [2] off protons. These reaction channels are dominated by a non-resonant background, which complicates the task of extracting the resonance information. In our model we fix the non-resonant amplitude, modeled in terms of t-channel Regge-trajectory exchange, at high energies where the amplitude is devoid of resonant contributions. In a next step, this amplitude is extrapolated into the resonance region and enriched with N∗ and Δ∗ exchange in the s-channel, resulting in a hybrid “Regge-plus-resonance” (RPR) model. In the electromagnetic vertex, we have incorporated the running of the coupling constants by using form factors as computed in the Bonn constituent-quark model. The RPR model yields a unified description of kaon photo- and electroproduction [3] from threshold up to invariant masses of several GeV. It provides a satisfactory account of the world data, notwithstanding the small number of free parameters. Beside model comparison with polarization data, we will present predictions for kaon production observables off neutrons.
[1] T. Corthals et al., Phys. Rev. C 73, 045207 (2006).
[2] T. Corthals et al., Phys. Rev. C 75, 045204 (2007).
[3] T. Corthals et al., Phys. Lett. B 656, 186 (2007).