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Markowitz, P. Monaghan, R. Gilman, R. J. Feuerbach, R. Lindgren, R. Michaels, R. Roche, R. Sheyor, R. Subedi, R. Suleiman, Seonho Choi, T. Holmstrom, V. Mamyan, V. Nelyubin, V. Sulkovsky, W. Bertozzi, X. Jiang, X. Zheng, Ya. I. Azimov, Y. Qiang, Z.-E. Meziani","submitted_at":"2006-09-15T03:58:20Z","abstract_excerpt":"A high-resolution (sigma_instr. = 1.5 MeV) search for narrow states (Gamma < 10 MeV) with masses of M_x approx 1500-1850 MeV in ep -> e'K^+ X, e'K^- X and e' pi^+ X electroproduction at small angles and low Q^2 was performed. These states would be candidate partner states of the reported Theta^+(1540) pentaquark. No statistically significant signal was observed in any of the channels at 90% C.L. 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