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http://hdl.handle.net/2445/141722
Title: | Limits for the Central Production of Θ+ and Ξ−−Pentaquarks in 920-GeV pA Collisions |
Author: | Conde, P. Garrido Beltrán, Lluís Peralta, D. HERA-B Collaboration |
Keywords: | Física de partícules Experiments Particle physics Experiments |
Issue Date: | 18-Nov-2004 |
Publisher: | American Physical Society |
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 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 −− . |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.93.212003 |
It is part of: | Physical Review Letters, 2004, vol. 93, num. 21, p. 212003 |
URI: | http://hdl.handle.net/2445/141722 |
Related resource: | https://doi.org/10.1103/PhysRevLett.93.212003 |
ISSN: | 0031-9007 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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