A gauge invariant chiral unitary framework for kaon photo- and electroproduction on the proton

Abstract

We present a gauge invariant approach to photoproduction of mesons on nucleons within a chiral unitary framework. The interaction kernel for meson-baryon scattering is derived from the chiral effective Lagrangian and iterated in a Bethe-Salpeter equation. Within the leading order approximation to the interaction kernel, data on kaon photoproduction from SAPHIR, CLAS and CBELSA/TAPS are analyzed in the threshold region. The importance of gauge invariance and the precision of various approximations in the interaction kernel utilized in earlier works are discussed.

23 pages, 13 figs, EPJ A style

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• K^- p scattering length from scattering experiments
• On the Strangeness -1 S-wave Meson-Baryon Scattering
• Measurement of the reaction gamma p --> K0 Sigma+ at photon energies up to 2.6 GeV
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• Role of a triangle singularity in the $\gamma p\to K^{+}\Lambda (1405)$ reaction
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• Measurement of polarisation observables in $K_s^0{\Sigma }^{+}$ photoproduction off the proton
• $J/\psi N$ interactions revisited and ${\Lambda }_b^0\to J/\psi K^{-}({\pi }^{-})p$ decays
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