|
Title
|
|
|
|
Search for pentaquarks in the hadronic decays of the Z boson with the DELPHI detector at LEP
| |
|
Author
|
|
|
|
| |
|
Institution/Organisation
|
|
|
|
DELPHI Collaboration
| |
|
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. |
| |
|
Language
|
|
|
|
English
| |
|
Source (journal)
|
|
|
|
Physics letters : B. - Amsterdam, 1967, currens
| |
|
Publication
|
|
|
|
Amsterdam
:
North-Holland
,
2007
| |
|
ISSN
|
|
|
|
0370-2693
| |
|
DOI
|
|
|
|
10.1016/J.PHYSLETB.2007.08.005
| |
|
Volume/pages
|
|
|
|
653
:2/4
(2007)
, p. 151-160
| |
|
ISI
|
|
|
|
000250074000007
| |
|
Full text (Publisher's DOI)
|
|
|
|
| |
|