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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

Y. Qiang , J. Annand , J. Arrington , Ya. I. Azimov , W. Bertozzi , G. Cates , J. P. Chen , Seonho Choi
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E. Chudakov F. Cusanno C. W. de Jager M. Epstein R. J. Feuerbach F. Garibaldi O. Gayou R. Gilman J. Gomez D. J. Hamilton J.-O. Hansen D. W. Higinbotham T. Holmstrom M. Iodice X. Jiang M. Jones J. LeRose R. Lindgren N. Liyanage D. J. Margaziotis P. Markowitz V. Mamyan R. Michaels Z.-E. Meziani P. Monaghan C. Munoz-Camacho V. Nelyubin K. Paschke E. Piasetzky I. Rachek P. E. Reimer J. Reinhold B. Reitz R. Roche A. Saha A. Sarty E. Schulte A. Shahinyan R. Sheyor J. Singh I. I. Strakovsky R. Subedi R. Suleiman V. Sulkovsky B. Wojtsekhowski X. Zheng
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classification hep-exnucl-ex
keywords statespentaquarkproductionsearchsigmathetaanglesapprox
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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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