Threshold kaon photo- and electroproduction in SU(3) baryon chiral perturbation theory
Sven Steininger, Ulf-G. Meißner
Abstract
We calculate the processes γp K0 Σ+ , K+ Σ0, K+ Λ in three flavor heavy baryon chiral perturbation theory to one loop. Some low--energy constants are fixed from single baryon properties while others are estimated by means of resonance saturation. The total cross sections are comparable with the few existing data points in the threshold region. The angular dependences of the recoil polarization of the Λ and Σ0 show most features of the ones measured at ELSA. We also predict the isovector charge radius of the Σ+, < r2V >Σ+ = (0.30 0.03) fm2.
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