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| Título: | Search for pentaquarks in the hadronic decays of the Z boson with the DELPHI detector at LEP |
Autor: | Abdallah, J.; Perepelitsa, Vassil; García García, Carmen CSIC ORCID; Cuevas, Javier CSIC ORCID; Piedra, Jonatan CSIC ORCID ; Costa, María José CSIC ORCID; Rodríguez, David; Matorras, Francisco CSIC ORCID ; Marco, Jesús CSIC ORCID ; Marco, Rafael CSIC; Oyanguren, Arantza CSIC ORCID; Fernández Menéndez, Javier CSIC ORCID; Ferrer, Antonio CSIC ORCID; Salt, José CSIC ORCID; Fuster, Juan CSIC ORCID; Tortosa, Pablo CSIC; Martínez-Rivero, Celso CSIC ORCID | Palabras clave: | Baryon production Production-rates Resonances Theta(+) High Energy Physics Vector Masses States Meson Light |
Fecha de publicación: | 6-ago-2007 | Editor: | Elsevier | Citación: | Physics Letters B 653(2-4): 151-160 (2007) | Resumen: | The quark model does not exclude states composed of more than three quarks, like pentaquark systems. Controversial evidence for such states has been published in the last years, in particular: for a strange pentaquark Θ(1540)(+); for a double-strange state, the Ξ(1862)(--), subsequently called Φ(1860)--; and for a charmed state, the Θ(c)(3100)(0). If confirmed, a full pentaquark family might exist; such pentaquark states could be produced in e(+)e(-) annihilations near the Z energy. In this Letter a search for pentaquarks is described using the DELPHI detector at LEP, characterized by powerful particle identification sub-systems crucial in the separation of the signal from the background for these states. At 95% CL, upper limits are set on the production rates <N> of such particles and their charge-conjugate state per Z decay: <N-Θ+> x Br(Θ(+) -> pK(S)(0)) < 5.1x10(-4), <N-Θ++> < 1.6x10(-3), <N-Φ(1860)--> x Br(Φ(1860)-- -> Ξ(-)π(-)) < 2.9x10(-4), <N-Θ(c)(3100)0> x Br(Θ(c)(3100)(0) -> D*(+)p over-bar) < 8.8x10(-4). | Descripción: | 10 pages, 5 figures.-- El Pdf del archivo es la versión pre-print: arXiv:0708.0415v1.-- DELPHI Collaboration: et al. | Versión del editor: | http://dx.doi.org/10.1016/j.physletb.2007.08.005 | URI: | http://hdl.handle.net/10261/8532 | DOI: | 10.1016/j.physletb.2007.08.005 | ISSN: | 0370-2693 |
| Aparece en las colecciones: | (IFCA) Artículos (IFIC) Artículos |
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| Fichero | Descripción | Tamaño | Formato | |
|---|---|---|---|---|
| 0708.0415v1.pdf | 518,37 kB | Adobe PDF |  Visualizar/Abrir |
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