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Abstract: We present predictions for ngamma,K+Sigma- differential cross sections andphoton-beam asymmetries and compare them to recent LEPS data. We adapt aRegge-plus-resonance RPR model developed to describe photoinduced andelectroinduced kaon production off protons. The non-resonant contributions tothe amplitude are modelled in terms of K+494 and K*+892 Regge-trajectoryexchange. This amplitude is supplemented with a selection of s-channelresonance diagrams. The three Regge-model parameters of the ngamma,K+Sigma-amplitude are derived from the ones fitted to proton data through SU2 isospinconsiderations. A fair description of the ngamma,K+Sigma- data is realized,which demonstrates the Regge model-s robustness and predictive power.Conversion of the resonances- couplings from the proton to the neutron is morechallenging, as it requires knowledge of the photocoupling helicity amplitudes.We illustrate how the uncertainties of the helicity amplitudes propagate andheavily restrain the predictive power of the RPR and isobar models for kaonproduction off neutron targets.



Author: P. Vancraeyveld, L. De Cruz, J. Ryckebusch, T. Van Cauteren

Source: https://arxiv.org/



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