Regge-plus-resonance predictions for kaon photoproduction from the neutron

Abstract

We present predictions for n(γ, K + )Σ − differential cross sections and photonbeam asymmetries and compare them to recent LEPS data. We adapt a Reggeplus-resonance (RPR) model developed to describe photoinduced and electroinduced kaon production off protons. The non-resonant contributions to the amplitude are modelled in terms of K + (494) and K * + (892) Regge-trajectory exchange. This amplitude is supplemented with a selection of s-channel resonance diagrams. The three Regge-model parameters of the n(γ, K + )Σ − amplitude are derived from the ones fitted to proton data through SU (2) isospin considerations. A fair description of the n(γ, K + )Σ − 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 more challenging, as it requires knowledge of the photocoupling helicity amplitudes. We illustrate how the uncertainties of the helicity amplitudes propagate and heavily restrain the predictive power of the RPR and isobar models for kaon production off neutron targets.

P -wave excited baryons from pion- and photo-induced hyperon production

“…The physics at MAMI (among other data) has been closely followed by the MAID group of Drechsel and Tiator [131,132,133,134,135,136,137,138]. Smaller groups at Zagreb [139,140,141,142], Gent [143,144,145,146] and KVI made significant contributions to the field [147,148,149,150,151]. A few further papers are to be mentioned [152,153,154,155,156].…”

Bayesian analysis of kaon photoproduction with the Regge-plus-resonance model

“…We will consider several variants of the RPR model and use Bayesian inference to select the most probable model given the world's data. The RPR model has been shown to efficiently describe the p(γ, K + )Λ observables over a broad energy range [9,14,15]. The RPR framework, as it will be used in this work, has a modest number of adjustable parameters.…”

Electromagnetic production of kaons near threshold

“…Most of them have been performed in the framework of tree-level isobar models [1][2][3][4][5][6][7], coupled channel approaches [8][9][10][11][12], Regge model [13], or quark models [14,15]. Extending the energy range of isobar models to higher region by utilizing Regge formalism has also been pursued recently [16][17][18][19]. At present, experimental data are abundant from threshold up to 2.5 GeV.…”