Sigma photoproduction in the resonance region

Abstract

A study of p(gamma,K)Sigma processes in an isobar model at tree level is reported. By comparing model calculations to the published SAPHIR data, we explore the possible role of different isospin I=1/2 (N*) and I=3/2 (Delta*) resonances in the reaction dynamics. In our analysis, the inclusion of the ``missing'' D_{13}(1895) resonance does only slightly improve the global description of the Sigma photoproduction data. More convincing signals for the presence of such a ``missing'' resonance emerged in the analysis of the isospin related p(gamma,K+)Lambda reaction. Various implementations of the nonresonant part of the Sigma photoproduction amplitude are presented. The sensitivity of the computed observables and extracted resonance parameters to the uncertainties inherent to the treatment of the nonresonant (background) diagrams are discussed.

subsection and table added, to appear in Phys. Rev. C

References in corpus (4)

• Kaon photoproduction: background contributions, form factors and missing resonances
• Form factors and photoproduction amplitudes
• The role of hyperon resonances in p(gamma,K+)Lambda processes
• Coupled-channel study of gamma p --> K+ Lambda

Cited by in corpus (20)

• Measurement of gamma p --> K+ Lambda and gamma p --> K+ Sigma0 at photon energies up to 2.6 GeV
• 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
• Vector meson production and nucleon resonance analysis in a coupled-channel approach for energies m_N < sqrt(s) < 2 GeV II: photon-induced results
• Beam polarization asymmetries for the p(gamma,K+)Lambda and p(gamma,K+)Sigma0 reactions at Egamma=1.5-2.4 GeV
• Decays of Baryon Resonances into K Lambda, K^+ Sigma^0 and K^0 Sigma^+
• Differential cross sections and recoil polarizations for the reaction gamma p -> K+ Sigma0
• Separation of the Longitudinal and Transverse Cross Sections in the p(ee'K)Lambda and p(ee'K)Sigma Reactions
• Regge-plus-resonance treatment of the p(gamma,K^+)Sigma^0 and p(gamma,K^0)Sigma^+ reactions at forward kaon angles
• A Genetic Algorithm Analysis of N* Resonances in $p(\gamma ,K^{+})\Lambda$ Reactions
• Helicity amplitudes and electromagnetic decays of hyperon resonances
• Coupled-channel analysis of $K\Sigma$ production on the nucleon up to 2.0 GeV
• Electric and magnetic form factors of strange baryons
• Coherent Theta^+ and Lambda(1520) photoproduction off the deuteron
• Electromagnetic production of $K\Sigma$ on the nucleon near threshold
• Goldberger-Treiman constraint criteria for hyperon coupling constants
• New fits to the reaction $\gamma p\to K^{+}\Lambda$
• Observation of a cusp-like structure in the $\gamma p\to K^{+}{\Sigma }^0$ cross section at forward angles and low momentum transfer
• Investigating the parity of the exotic Theta^+ baryon from the kaon photoproduction
• Some aspects of ${\Theta }^{+}$ parity determination in the reaction $\gamma N\to {\Theta }^{+}\bar{K}\to NK\bar{K}$
• Comparing phenomenological recipes with a microscopic model for the electric amplitude in strangeness photoproduction