Search for Theta+ and Xi--3/2 pentaquarks in HERA-B
Abstract
A search for Theta+(1540) and Xi--3/2(1862) pentaquark candidates has been performed in proton-induced reactions on C, Ti and W targets at sqrt(s) = 41.6 GeV studying the pKs resp. Xi-pi- and Xi-pi+ (and charge conjugated) decay channels at mid-rapidity. With sensitivities of (Br)x(dsigma/dxF) < 5 to 25 microbarn/nucleon, we find no evidence for narrow pentaquark peaks in any of the studied final states. Preliminary values for the upper limit of relative yield ratios at mid-rapidity are (Theta+(1540)) / (Lambda(1520)) < 0.02, (Br)x(Xi--3/2(1862)) / (Xi(1530)0) < 0.077, and (Br)x(Xibar++3/2(1862)) / (Xibar(1530)0) < 0.058 at 95% CL.
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