61 research outputs found
Chiral Mass Splitting for c \bar{s} and c \bar{n} Mesons in the \tilde{U}(12)-Classification Scheme of Hadrons
We investigate the chiral mass splitting of parity-doubled J=0,1 states for c
\bar{s} and c \bar{n} meson systems in the \tilde{U}(12)_{SF}-classification
scheme of hadrons, using the linear sigma model to describe the light-quark
pseudoscalar and scalar mesons together with the spontaneous breaking of chiral
symmetry, and consequently predict the masses of as-yet-unobserved
(0^{+},1^{+}) c \bar{n} mesons. We also mention some indications of their
existence in the recent published data from the Belle and BABAR Collaborations.Comment: 5 pages, 1 figures, talk at the 11th International Conference on
Hadron Spectroscopy, Rio de Janeiro, Brazil, 21-26 Aug 2005, to appear in the
Proceeding
Covariant Description of Composite Meson Systems and Chiral Symmetry
Assuming the spin-independence for confining force, we give a covariant quark
representation of general composite meson systems with definite Lorentz
transformation properties. For benefit of this representation we are able to
deduce automatically the transformation rules of composite mesons for general
symmetry operations from those of constituent (exciton) quarks. Applying this
we investigate especially physical implication of chiral symmetry for the meson
systems, and point out a possibility of existence of new meson multiplets.Comment: talk given in HADRON'99 in Beijing, August 1999. 4 pages, uses
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