Ridge regression for minimizing the couplings of hyperon resonances in the $K^{+}\Lambda$ photoproduction

Abstract

We employed the isobar model for investigating the $K^{+}\Lambda$ photoproduction process. We paid special attention to the recent CLAS polarization data and enhanced the ${\chi }^2$ minimization by adding a penalty term. Without changing the set of included resonances used by the model, this technique known as Ridge regression leads to reduced couplings that in previous studies acquired unreasonably large values. As a result, we have arrived at a much more robust model with hyperon couplings which are reduced to more physical values. This model serves us to extract valuable information on the background to the $K^{+}\Lambda$ photoproduction and particularly on the role of various hyperon resonances. The set of the nucleon resonances is the same with respect to previous fits but their role may have changed due to different couplings which they acquire in the present fit.

arXiv comment12 pages, 12 figures, 1 table

References in corpus (34)

• Properties of baryon resonances from a multichannel partial wave analysis
• Differential Cross Sections for gamma + p --> K+ + Y for Lambda and Sigma0 Hyperons
• Evidence for a missing nucleon resonance in kaon photoproduction
• Nucleon resonances within a dynamical coupled-channels model of pi N and gamma N reactions
• Hyperon Photoproduction in the Nucleon Resonance Region
• The gamma + p to K+ + Lambda and gamma + p to K+ + Sigma0 reactions at forward angles with photon energies from 1.5 to 2.4 GeV
• Quantization of an interacting spin-3/2 field and the Delta isobar
• Differential cross section and recoil polarization measurements for the gamma p to K+ Lambda reaction using CLAS at Jefferson Lab
• First Measurement of Beam-Recoil Observables Cx and Cz in Hyperon Photoproduction
• Decays of Baryon Resonances into K Lambda, K^+ Sigma^0 and K^0 Sigma^+
• Kaon photoproduction: background contributions, form factors and missing resonances
• A coupled-channel analysis of $K\Lambda$ production in the nucleon resonance region
• Dynamical coupled-channel approach to hadronic and electromagnetic production of kaon-hyperon on the proton
• Off-shell effects in the electromagnetic production of strangeness
• Forward-angle K+ Lambda photoproduction in a Regge-plus-resonance approach
• A gauge invariant chiral unitary framework for kaon photo- and electroproduction on the proton
• Baryon resonances and polarization transfer in hyperon photoproduction
• Photoproduction of $\Lambda$ and ${\Sigma }^0$ hyperons using linearly polarized photons
• The role of hyperon resonances in p(gamma,K+)Lambda processes
• Consistent interactions for high-spin fermion fields
• The impact of ${\mathbf{K}}^{+}\mathbf{\Lambda }$ photoproduction on the resonance spectrum
• A Bayesian analysis of kaon photoproduction with the Regge-plus-resonance model
• Photoproduction of $K\Lambda$ on the proton
• Model Selection for Pion Photoproduction
• Photo- and electroproduction of $K^{+}\Lambda$ with unitarity-restored isobar model
• Analysis of the consistency of kaon photoproduction data with Lambda in the final state
• Extraction of N* information from the limited p(gamma,K+)Lambda data set
• The associated photoproduction of K+ meson off proton within a coupled-channels K-matrix approach
• Towards the Minimal Spectrum of Excited Baryons
• New fits to the reaction $\gamma p\to K^{+}\Lambda$
• Are hyperon resonances required in the elementary $K^{+}\Lambda$ photoproduction?
• Model selection for amplitude analysis
• $N^{\ast }$ resonances from $K\Lambda$ amplitudes in sliced bins in energy
• Model selection for $K^{+}{\Sigma }^{-}$ photoproduction within isobar model