A large data set of proton-nucleus collisions at \sqrt {s} =41.6 GeV has been searched for {\Theta }+ and {\Xi }(1862) pentaquark candidates. In 2 \times 108 inelastic events we find no evidence for narrow signals (\sigma \approx 5 MeV/c2 ) in the {\Theta }+ \rightarrow p K0s and {\Xi }(1862) \rightarrow {\Xi } \pi channels. Upper limits on production cross sections at mid-rapidity and on ratios of production cross sections to those of well established resonances are presented.
PACS numbers: 13.30.Eg, 13.85.Rm, 14.80.--j
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