Search for Σ(5)(0), N(5)(0), and Θ++ Pentaquark States
/ Authors
Y. Qiang, J. Annand, J. Arrington, Y. Azimov, W. Bertozzi, G. Cates, Jian-Ping Chen, Seonho Choi, E. Chudakov, F. Cusanno
and 43 more authors
C. D. Jager, M. Epstein, R. Feuerbach, F. Garibaldi, O. Gayou, R. Gilman, J. Gomez, D. Hamilton, J. Hansen, D. Higinbotham, T. Holmstrom, M. Iodice, Xiaodong Jiang, Mark Jones, J. LeRose, R. Lindgren, N. Liyanage, D. Margaziotis, P. Markowitz, V. Mamyan, R. Michaels, Z. Meziani, P. Monaghan, C. Munoz-Camacho, V. Nelyubin, K. Paschke, E. Piasetzky, I. Rachek, P. E. Reimer, J. Reinhold, B. Reitz, R. Roché, A. Saha, A. Sarty, E. Schulte, A. Shahinyan, R. Sheyor, I. Strakovsky, R. Subedi, R. Suleiman, V. Sulkovsky, B. Wojtsekhowski, X. Zheng
/ Abstract
A high-resolution (σinstr.=1.5 MeV) search for narrow states (Γ<10 MeV) with masses of Mx≈1500–1850 MeV in ep→e′K+X,e′K-X, and e′π+X electroproduction at small angles and low Q2 was performed. These states would be candidate partner states of the reported Θ+(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 0.8% and 4.9% of the Λ(1520) production cross section, depending on the channel and the assumed mass and width of the state.
Journal: Physical Review C