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Title
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Search for pentaquarks in the hadronic decays of the Z boson with the DELPHI detector at LEP
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Author
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Institution/Organisation
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DELPHI Collaboration
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Abstract
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| 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 Θc(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 left angle bracketNright-pointing angle bracket of such particles and their charge-conjugate state per Z decay: View the MathML source, left angle bracketNΘ++right-pointing angle bracket<1.6×10−3, left angle bracketNΦ(1860)−−right-pointing angle bracket×Br(Φ(1860)−−→Ξ−π−)<2.9×10−4, View the MathML source. |
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Language
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English
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Source (journal)
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Physics letters : B. - Amsterdam, 1967, currens
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Publication
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Amsterdam
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North-Holland
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2007
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ISSN
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0370-2693
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Volume/pages
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653
:2/4
(2007)
, p. 151-160
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ISI
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000250074000007
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Full text (Publisher's DOI)
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