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Muramatsu, P.M. Shagin, S.C. Wang, S. Date, S. Makino, T. Hotta, T. Ishikawa, T. Iwata, T. Matsumura, T. Mibe, T. Nakano, T. Ooba, T. Sasaki, T. Yorita, W.C. Chang, Y. Asano, Y. Miyachi, Y. Ohashi, Y. Shiino, Y. Sugaya, Z.Y. Kim","submitted_at":"2003-02-07T10:46:21Z","abstract_excerpt":"Beam polarization asymmetries for the p(gamma,K+)Lambda and p(gamma,K+)sigma0 reactions are measured for the first time for Egamma=1.5-2.4 GeV and 0.6<cos(theta_cm(K+))<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. 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