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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 ; Cuevas, Javier ; Piedra, Jonatan ; Costa, María José ; Rodríguez, David; Matorras, Francisco ; Marco, Jesús ; Marco, Rafael ; Oyanguren, Arantza ; Fernández Menéndez, Javier ; Ferrer, Antonio ; Salt, José ; Fuster, Juan ; Tortosa, Pablo ; Martínez-Rivero, Celso
Palabras clave Baryon production
Production-rates
Resonance
Theta(+)
High Energy Physics
Vector
Masses
States
Meson
Light
Fecha de publicación 6-ago-2007
EditorElsevier
Citación Physics Letters B 653(2-4): 151-160 (2007)
ResumenThe 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 editorhttp://dx.doi.org/10.1016/j.physletb.2007.08.005
URI http://hdl.handle.net/10261/8532
DOI10.1016/j.physletb.2007.08.005
ISSN0370-2693
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