119 research outputs found
Axial-vector mesons in a relativistic point-form approach
The Poincare invariant coupled-channel formalism for two-particle systems
interacting via one-particle exchange, which has been developed and applied to
vector mesons in Ref. [1] is applied to axial vector mesons. We thereby extend
the previous study of a dynamical treatment of the Goldstone-boson exchange by
comparison with the commonly used instantaneous approximation to the case of
orbital angular momentum l=1. Effects in the mass shifts show more variations
than for the vector-meson case. Results for the decay widths are sizable, but
comparison with sparse experimental data is inconclusive.Comment: 4 pages, 1 figur
Quasi-exotic open-flavor mesons
Meson states with exotic quantum numbers arise naturally in a covariant
bound-state framework in QCD. We investigate the consequences of shifting quark
masses such that the states are no longer restricted to certain C-parities, but
only by J^P. Then, a priori, one can no longer distinguish exotic or
conventional states. In order to identify signatures of the different states to
look for experimentally, we provide the behavior of masses, leptonic decay
constants, and orbital-angular-momentum decomposition of such mesons, as well
as the constellations in which they could be found. Most prominently, we
consider the case of charged quasi-exotic excitations of the pion.Comment: 10 pages, 5 figures, 2 tables, revised version incorporating reviewer
comment
Light-meson properties from the Bethe-Salpeter equation
We discuss how to extract observables from an inhomogeneous vertex
Bethe-Salpeter equation without resorting to the corresponding homogeneous
equation. As an example we present a prediction for the decay width of
the or meson. We also attempt to identify the momentum
range contributing to a vector meson's decay constant.Comment: 3 pages, 3 figures, talk presented at the conference "Quark
Confinement and the Hadron Spectrum IX", Madrid, Spain, 30th of August-3rd of
September 2010; submitted to the proceeding
Meson spectroscopy and properties using Dyson-Schwinger equations
We study pseudoscalar and scalar mesons using a practical and symmetry
preserving truncation of QCD's Dyson-Schwinger equations. We investigate and
compare properties of ground and radially excited meson states. In addition to
exact results for radial meson excitations we also present results for meson
masses and decay constants from the chiral limit up to the charm-quark mass, e.
g., the mass of the chi_{c0} (2P) meson.Comment: 8 pages, 3 figures, To appear in the proceedings of 9th International
Workshop on Meson Production, Properties and Interaction (Meson2006), Krakow,
Poland, 9 - 13 June 200
- …