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

Y. Qiang; J. Annand; J. Arrington; Ya. I. Azimov; W. Bertozzi; G. Cates; J. P. Chen; Seonho Choi; 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

doi:10.1103/physrevc.75.055208

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arXiv · hep-ex/0609025

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

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Abstract

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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Y. Qiang, J. Annand, J. Arrington, Ya. I. Azimov, W. Bertozzi, G. Cates, J. P. Chen, Seonho Choi, 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. 2007-05-02. A Search for Sigma^0_5, N^0_5 and Theta^++ Pentaquark States. https://doi.org/10.1103/physrevc.75.055208

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