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- W2119662874 abstract "We have searched for Θ+(1540) and Ξ--(1862) pentaquark candidates in proton-induced reactions on C, Ti, and W targets at midrapidity and s=41.6 GeV. In 2×108 inelastic events we find no evidence for narrow (σ≈5 MeV) signals in the Θ+→pKS0 and Ξ--→Ξ−π− channels; our 95% C.L. upper limits (UL) for the inclusive production cross section times branching fraction B dσ/dy|y≈0 are (4–16)μb/N for a Θ+ mass between 1521 and 1555 MeV, and 2.5μb/N for the Ξ--. The UL of the yield ratio of Θ+/Λ(1520)<(3–12)% is significantly lower than model predictions. Our UL of B Ξ--/Ξ(1530)0<4% is at variance with the results that have provided the first evidence for the Ξ--.Received 12 August 2004DOI:https://doi.org/10.1103/PhysRevLett.93.212003©2004 American Physical Society" @default.
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