https://doi.org/10.1140/epjc/s10052-011-1762-7
Regular Article - Theoretical Physics
Delicate interplay between the D 0 D ∗0, ρ 0 J/ψ, and ωJ/ψ channels in the X(3872) resonance
1
Centro de Física das Interacções Fundamentais, Instituto Superior Técnico, Technical University of Lisbon, 1049-001, Lisbon, Portugal
2
Centro de Física Computacional, Departamento de Física, Universidade de Coimbra, 3004-516, Coimbra, Portugal
* e-mail: george@ist.utl.pt
Received:
15
June
2011
Revised:
26
July
2011
Published online:
5
October
2011
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.
© Springer-Verlag / Società Italiana di Fisica, 2011