Phys. Rev. Lett. 91, 092001 (2003) [4 pages]Beam-Polarization Asymmetries for the p(γ⃗,K+)Λ and p(γ⃗,K+)Σ0 Reactions for Eγ=1.5–2.4 GeVReceived 8 February 2003; published 26 August 2003 Beam polarization asymmetries for the p(γ⃗,K+)Λ and p(γ⃗,K+)Σ0 reactions are measured for the first time for Eγ=1.5–2.4 GeV and 0.6<cos(θK+c.m.)<1.0 by using linearly polarized photons at the Laser-Electron-Photon facility at SPring-8 (LEPS). The observed asymmetries are positive and gradually increase with rising photon energy. The data are not consistent with theoretical predictions based on tree-level effective-Lagrangian approaches. Including the new results in the development of the models is, therefore, crucial for understanding the reaction mechanism and to test the presence of baryon resonances which are predicted in quark models but are thus far undiscovered. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.092001
DOI:
10.1103/PhysRevLett.91.092001
PACS:
13.60.Le, 14.20.Gk
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