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A Search for Sigma^0_5, N^0_5 and Theta^++ Pentaquark States

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arxiv hep-ex/0609025 v2 pith:6DIT37YZ submitted 2006-09-15 hep-ex nucl-ex

classification hep-exnucl-ex
keywords statespentaquarkproductionsearchsigmathetaanglesapprox
verification ladder T0 review T1 audit T2 compute T3 formal
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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 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. Upper limits on forward production were determined to be between 0.7% and 4.2% of the Lambda(1520) production cross section, depending on the channel and the assumed mass and width of the state.

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