Title
Search for pentaquarks in the hadronic decays of the Z boson with the DELPHI detector at LEP Search for pentaquarks in the hadronic decays of the Z boson with the DELPHI detector at LEP
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Amsterdam ,
Subject
Physics
Source (journal)
Physics letters: B. - Amsterdam, 1967, currens
Volume/pages
653(2007) :2/4 , p. 151-160
ISSN
0370-2693
ISI
000250074000007
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
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 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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