Detalle de: Search for pentaquarks in the hadronic decays of the Z boson with the DELPHI detector at LEP
| Title | Search for pentaquarks in the hadronic decays of the Z boson with the DELPHI detector at LEP |
| Abstract |
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 Theta(1540)(+); for a double-strange state, the Xi(1862)(--), subsequently called Phi(1860)--; and for a charmed state, the Theta(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-Theta+ x Br(Theta(+) -> pK(S)(0)) Xi(-)pi(-)) D*(+)p) < 8.8 x 10(-4). (c) 2007 Elsevier B.V. All rights reserved. |
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| Doi | 10.1016/j.physletb.2007.08.005 |
| Publication Date | Sep 2007 |
| Publication Type | Article |
| Researcher | David Rodríguez González |
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