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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/141722
Limits for the Central Production of Θ+ and Ξ−−Pentaquarks in 920-GeV pA Collisions
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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 G e V . In 2 × 10 8 inelastic events we find no evidence for narrow ( σ ≈ 5 M e V ) signals in the Θ + → p K 0 S and Ξ −− → Ξ − π − channels; our 95% C.L. upper limits (UL) for the inclusive production cross section times branching fraction B d σ / d y | y ≈ 0 are ( 4 - 16 ) μ b / N for a Θ + mass between 1521 and 1555 MeV, and 2.5 μ b / 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 −− .
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CONDE, P., et al. Limits for the Central Production of Θ+ and Ξ−−Pentaquarks in 920-GeV pA Collisions. Physical Review Letters. 2004. Vol. 93, num. 21, pags. 212003. ISSN 0031-9007. [consulted: 8 of August of 2026]. Available at: https://hdl.handle.net/2445/141722