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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 ande' pi^+ X electroproduction at small angles and low Q^2 was performed. Thesestates would be candidate partner states of the reported Theta^+(1540)pentaquark. No statistically significant signal was observed in any of thechannels at 90% C.L. Upper limits on forward production were determined to bebetween 0.7% and 4.2% of the Lambda(1520) production cross section, dependingon the channel and the assumed mass and width of the state.Comment: 5 pages, 5 figures, to appear in Phys. Rev. C, update with responses  to referee suggestion

physical review c

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