Quasibound states in the continuum: A dynamical coupled-channel calculation of axial-vector charmed mesons

Journal Article · Tue Nov 01 00:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.84.094020· OSTI ID:21608026

Coito, Susana; Rupp, George; Beveren, Eef van ^[1]

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1. Centro de Fisica das Interaccoes Fundamentais, Instituto Superior Tecnico, Technical University of Lisbon, P-1049-001 Lisboa (Portugal)

Masses and widths of the axial-vector charmed mesons D{sub 1}(2420), D{sub 1}(2430), D{sub s1}(2536), and D{sub s1}(2460) are calculated nonperturbatively in the resonance-spectrum-expansion model, by coupling various open and closed meson-meson channels to the bare J{sup P}=1{sup +} cq (q=u, d) and cs states. The coupling to two-meson channels dynamically mixes and lifts the mass degeneracy of the spectroscopic {sup 3}P{sub 1} and {sup 1}P{sub 1} states, as an alternative to the usual spin-orbit splitting. Of the two resulting S-matrix poles in either case, one stays very close to the energy of the bare state, as a quasibound state in the continuum, whereas the other shifts considerably. This is in agreement with the experimental observation that the D{sub 1}(2420) and D{sub s1}(2536) have much smaller widths than one would naively expect. The whole pattern of masses and widths of the axial-vector charmed mesons can thus be quite well reproduced with only two free parameters, one of which being already strongly constrained by previous model calculations. Finally, predictions for pole positions of radially excited axial-vector charmed mesons are presented.

• OSTI ID: 21608026
• Journal Information: Physical Review. D, Particles Fields, Vol. 84, Issue 9; Other Information: DOI: 10.1103/PhysRevD.84.094020; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AXIAL VECTOR MESONS
CHARMED MESONS
COUPLED CHANNEL THEORY
COUPLING
D S MESONS
D S-2536 MESONS
D1-2420 MESONS
EXPANSION
MASS
ORBITS
QUASIBOUND STATE
RESONANCE
S MATRIX
SPECTRA
SPIN
ANGULAR MOMENTUM
BOSONS
CHARM PARTICLES
ELEMENTARY PARTICLES
HADRONS
MATRICES
MESONS
PARTICLE PROPERTIES
PSEUDOSCALAR MESONS
STRANGE MESONS
STRANGE PARTICLES