The narrow width of the Θ+ - A possible explanation

Marek Karliner*, Harry J. Lipkin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The narrow width of the exotic narrow baryon resonance Θ+ might be explained by mixing between the two nearly degenerate states that arise in models with two diquarks and an antiquark. The only open Θ+ decay channel is KN. When two states both coupled to a single dominant decay mode are mixed by the loop diagram via this decay mode, diagonalization of the loop diagram decouples one mass eigenstate from this decay mode as in some treatments of the ρ-π decay from the mixed singlet-octet ω-φ system, the K*-π decay of the strange axial vector mesons and the NK couplings of some baryons. This mechanism can explain the narrow width and weak coupling of Θ +→KN while allowing a relatively large production cross section from K* exchange. Interesting tests are suggested in K -p reactions where backward kaon production must go by exotic baryon exchange.

Original languageEnglish
Pages (from-to)303-306
Number of pages4
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number3-4
StatePublished - 29 Apr 2004


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