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oai:recercat.cat:2445/1406432025-12-05T16:43:35Zcom_2072_1057col_2072_478823col_2072_478917

Search for Strange-Pentaquark Production in e+e− Annihilation at √s=10.58 GeVc Graugés Pous, Eugeni BABAR Collaboration Física de partícules Experiments Particle physics Experiments We search for strange-pentaquark states that have been previously reported by other experiments the Θ ( 1540 ) + , Ξ 5 ( 1860 ) −− , and Ξ 5 ( 1860 ) 0 in 123     fb − 1 of data recorded with the BABAR detector at the PEP-II e + e − storage ring. We find no evidence for these states and set 95% confidence level upper limits on the number of Θ ( 1540 ) + and Ξ 5 ( 1860 ) −− pentaquarks produced per e + e − annihilation into q ¯ q and per Υ ( 4 S ) decay. For q ¯ q events the Θ ( 1540 ) + [ Ξ 5 ( 1860 ) −− ] limit is about 8 [4] times lower than the rates measured for ordinary baryons of similar mass. 2019-09-20T11:22:50Z 2019-09-20T11:22:50Z 2005-07-21 2019-09-20T11:22:50Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 0031-9007 https://hdl.handle.net/2445/140643 539087 eng Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.95.042002 Physical Review Letters, 2005, vol. 95, num. 4, p. 042002 https://doi.org/10.1103/PhysRevLett.95.042002 (c) American Physical Society, 2005 info:eu-repo/semantics/openAccess 7 p. application/pdf American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)