“Variant Mass and Width” of the Axial-Vector a1 and b1 Mesons and Existence of Hybrid States
- 1 July 1992
- journal article
- Published by Oxford University Press (OUP) in Progress of Theoretical Physics
- Vol. 88 (1) , 89-101
- https://doi.org/10.1143/ptp.88.89
Abstract
In a recent experiment on the peripheral π-p charge-exchange reaction at KEK it has been observed that the a1 meson has very different values of mass and width, compared to the ones thus far obtained with the diffractive process, as well as compared to the ones recently obtained with the central-collision process. Similarly in the same experiment the b1 meson observed in the ρη channel has been shown to have an appreciably higher mass and a somewhat narrower width than the respective standard values obtained in the ωπ channel. We argue that these “variant mass and width” of the a1 and b1 mesons are, respectively, due to interference between the two “doubling” partners with the same quantum numbers, an ordinary qq meson and a hybrid qqg meson. A very simple actual analysis is performed which seems to suggest the validity of our interpretation.Keywords
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