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Search for pentaquarks in the hadronic decays of the Z boson with the DELPHI detector at LEP

Abdallah J.
•
Abreu P.
•
Adam W.
altro
DE LOTTO, Barbara
2007
  • journal article

Periodico
PHYSICS LETTERS. SECTION B
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)) < 5.1 x 10(-4), N(Theta++) < 1.6 x 10(-3), N(Phi(1860)--) x Br((P(1860)-- -> Xi(-)pi(-)) < 2.9 x 10(-4), N(Theta c(3100)0) x Br(Theta(c)(3100)(0) -> D*(+)p) < 8.8 x 10(-4). (c) 2007 Elsevier B.V. All rights reserved.
DOI
10.1016/j.physletb.2007.08.005
WOS
WOS:000250074000007
Archivio
http://hdl.handle.net/11390/877431
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-34548490917
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Data di acquisizione
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