Hyperon Photo and Electro Production at CLAS

Abstract

Developments in strangeness photo- and electro- production off the proton, as investigated using the CLAS system in Hall B at Jefferson Lab, are discussed in this paper. By measuring sufficient spin observables one can decompose the reaction mechanism into elementary amplitudes. We discuss progress toward this end in recent data from CLAS, including cross sections and spin observables. We next discuss new results on the mass distribution of the $\Lambda (1405)$, which shows signs of being a composite meson-baryon object of mixed isospin. The work on other hyperons such as the $\Xi$ resonances will be mentioned, and future prospects outlined.

8 pages, 3 figures, for Proceedings of "HYP-X" 10th International Conference on Hypernuclear and Strange Particle Physics, Tokai, Japan, September 2009. To be submitted to Nuclear Physics A

References in corpus (16)

• 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
• First Measurement of Beam-Recoil Observables Cx and Cz in Hyperon Photoproduction
• Lineshape of the Lambda(1405) Hyperon Measured Through its Sigma0 pion0 Decay
• Photoproduction of Lambda(1405) and Sigma^{0}(1385) on the proton at E_γ= 1.5-2.4 GeV
• Measurement of beam-recoil observables Ox, Oz and target asymmetry for the reaction gamma p -> K Lambda
• Separated Structure Functions for the Exclusive Electroproduction of $K^{+}\Lambda$ and $K^{+}{\Sigma }^0$ Final States
• Further evidence for N(1900)P_{13} from photoproduction of hyperons
• Searching for signatures around 1920 MeV of a $N^{\ast }$ state of three hadron nature
• Photoproduction of Xi off nucleons
• Beam-Recoil Polarization Transfer in the Nucleon Resonance Region in the Exclusive $\vec{e}p\to e^{\prime }{K}^{+}\vec{\Lambda }$ and $\vec{e}p\to e^{\prime }{K}^{+}{\vec{\Sigma }}^0$ Reactions at CLAS
• Cascade production in the reactions gamma p --> K+ K+ (X) and gamma p --> K^+ K^+ pi- (X)
• Polarized Structure Function ${\sigma }_{L{T}^{\prime }}$ for $p(\vec{e},e^{\prime }{K}^{+})\Lambda$ in the Nucleon Resonance Region
• Analysis of the consistency of kaon photoproduction data with Lambda in the final state
• Cross Sections for the $\gamma p\to K^{\ast 0}{\Sigma }^{+}$ Reaction at $E_{\gamma }=1.7-3.0$ GeV
• Polarization in Hyperon Photo- and Electro- Production
• Electromagnetic Productions of KLambda and KSigma on the Nucleons

Cited by in corpus (1)

• DN interaction from meson exchange