Search for Σ50,N50, and Θ++ pentaquark states

Y. Qiang et al. (Jefferson Lab Hall A Collaboration)
Phys. Rev. C 75, 055208 – Published 25 May 2007

Abstract

A high-resolution (σinstr.=1.5 MeV) search for narrow states (Γ<10 MeV) with masses of Mx15001850 MeV in epeK+X,eKX, and eπ+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.

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  • Received 18 September 2006

DOI:https://doi.org/10.1103/PhysRevC.75.055208

©2007 American Physical Society

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Vol. 75, Iss. 5 — May 2007

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