Interpretation of the Θ+ as an isotensor pentaquark with weakly decaying partners

The Θ+(1540), recently observed at LEPS, DIANA and CLAS, is hypothesized to be an isotensor resonance. This implies the existence of a multiplet where the Θ++, Θ+ and Θ0 have isospin-violating strong decays, and the Θ+++ and Θ− have weak decays and so are long-lived. Production mechanisms for the we...

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Bibliographic Details
Published inPhysics letters. B Vol. 570; no. 3-4; pp. 185 - 190
Main Authors Capstick, Simon, Page, Philip R., Roberts, Winston
Format Journal Article
LanguageEnglish
Published United States Elsevier B.V 25.09.2003
Subjects
ISOSPIN
Isotensor
MULTIPLETS
PARTICLE DECAY
PARTICLE PRODUCTION
Pentaquark
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
RESONANCE
TENSOR MESONS
Weak decay
12.39.Mk
14.80.-j
12.15.-y
Pentaquark
Isotensor
11.30.Hv
Weak decay
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Summary:The Θ+(1540), recently observed at LEPS, DIANA and CLAS, is hypothesized to be an isotensor resonance. This implies the existence of a multiplet where the Θ++, Θ+ and Θ0 have isospin-violating strong decays, and the Θ+++ and Θ− have weak decays and so are long-lived. Production mechanisms for the weakly-decaying states are discussed. The JP assignment of the Θ is most likely 1/2− or 3/2−.
Bibliography:JLAB-THY-03-141; DOE/ER/40150-3162; hep-ph/0307019
USDOE Office of Energy Research (ER) (US)
AC05-84ER40150
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2003.08.010