Photoproduction of $\Lambda$ and ${\Sigma }^0$ hyperons using linearly polarized photons

Abstract

Background: Measurements of polarization observables for the reactions $\vec{\gamma }p\to K^{+}\Lambda$ and $\vec{\gamma }p\to K^{+}{\Sigma }^0$ have been performed. This is part of a programme of measurements designed to study the spectrum of baryon resonances. Purpose: The accurate measurement of several polarization observables provides tight constraints for phenomenological fits. Beam-recoil observables for the $\vec{\gamma }p\to K^{+}{\Sigma }^0$ reaction have not been reported before now. Method: The measurements were carried out using linearly polarized photon beams and the CLAS detector at the Thomas Jefferson National Accelerator Facility. The energy range of the results is 1.71\,GeV $<W<$ 2.19\,GeV, with an angular range $-0.75<\cos {\theta }_K^{\star }<+0.85$. Results: The observables extracted for both reactions are beam asymmetry $\Sigma$, target asymmetry $T$, and the beam-recoil double polarization observables $O_x$ and $O_z$. Conclusions: Comparison with theoretical fits indicates that in the regions where no previous data existed, the new data contain significant new information, and strengthen the evidence for the set of resonances used in the latest Bonn-Gatchina fit.

arXiv comment29 pages, 13 figures

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• Photon beam asymmetry $\Sigma$ for $\eta$ and ${\eta }^{\prime }$ photoproduction from the proton
• Kaon Photoproduction and the $\Lambda$ Decay Parameter ${\alpha }_{-}$
• Strong evidence for nucleon resonances near 1900\,MeV
• Light baryon resonances from a coupled-channel study including $\mathbf{K\Sigma }$ photoproduction
• Investigation on radiation generated by Sub-GeV electrons in ultrashort Si and Ge bent crystals
• Coupled $K^{+}\Lambda$ and $K^0\Lambda$ photoproduction off the nucleon: Consequences from the recent CLAS and MAMI data and the $N(1680)P_{11}$ narrow state
• $N^{\ast }$ resonances from $K\Lambda$ amplitudes in sliced bins in energy
• Partial-Wave Analysis of $\gamma p\to K^{+}\Lambda$ using a multichannel framework
• Extracting the pole and Breit-Wigner properties of nucleon and $\Delta$ resonances from the $\gamma N\to K\Sigma$ photoproduction
• Beam-Recoil Transferred Polarization in $K^{+}Y$ Electroproduction in the Nucleon Resonance Region with CLAS12
• Measurement of the beam asymmetry $\Sigma$ and the target asymmetry $T$ in the photoproduction of $\omega$ mesons off the proton using CLAS at Jefferson Laboratory
• Photoproduction of $K^{+}\Lambda$ with a Regge-plus-resonance model
• Constraining P and CP violation in the main decay of the neutral Sigma hyperon
• Beam-Target Helicity Asymmetry $E$ in $K^0\Lambda$ and $K^0{\Sigma }^0$ Photoproduction on the Neutron
• Differential cross section and photon-beam asymmetry for the gamma p -> pi- Delta++(1232) reaction at forward pi- angles for Egamma=1.5-2.95 GeV
• Measurement of the Photon Beam Asymmetry in $\vec{\gamma }p\to K^{+}{\Sigma }^0$ at $E_{\gamma }=8.5$ GeV
• Ridge regression for minimizing the couplings of hyperon resonances in the $K^{+}\Lambda$ photoproduction
• Spectrum and Structure of Excited Baryons with CLAS
• Application of the single-channel, single-energy AA/PWA method to $K^{+}\Lambda$ photoproduction
• First Measurement of ${\Xi }^{-}$ Polarization in Photoproduction
• Laurent+Pietarinen Partial Wave Analysis
• Single-channel, single-energy partial-wave analysis with continuity improved through minimal phase constraints
• First Measurements of the Double-Polarization Observables $F$, $P$, and $H$ in $\omega$ Photoproduction off Transversely Polarized Protons in the $N^{\ast }$ Resonance Region