Delicate interplay between the D0D∗0, ρ0J/ψ, and ωJ/ψ channels in the X(3872) resonance

The nature of the X (3872) enhancement is analyzed in the framework of the Resonance-Spectrum Expansion, by studying it as a regular J PC =1 ++ charmonium state, though strongly influenced and shifted by open-charm decay channels. The observed but Okubo–Zweig–Iizuka-forbidden ρ 0 J / ψ and ωJ / ψ ch...

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Bibliographic Details
Published inThe European physical journal. C, Particles and fields Vol. 71; no. 10
Main Authors Coito, Susana, Rupp, George, van Beveren, Eef
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer-Verlag 2011
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Summary:The nature of the X (3872) enhancement is analyzed in the framework of the Resonance-Spectrum Expansion, by studying it as a regular J PC =1 ++ charmonium state, though strongly influenced and shifted by open-charm decay channels. The observed but Okubo–Zweig–Iizuka-forbidden ρ 0 J / ψ and ωJ / ψ channels are coupled as well, but effectively smeared out by using complex ρ 0 and ω masses, in order to account for their physical widths, followed by a rigorous algebraic procedure to restore unitarity. A very delicate interplay between the D 0 D ∗0 , ρ 0 J / ψ , and ωJ / ψ channels is observed. The data clearly suggest that the X (3872) is a very narrow axial-vector resonance, with a pole at or slightly below the D 0 D ∗0 threshold.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-011-1762-7