Two-pole structure of the h1 (1415) axial-vector meson: Resolving the mass discrepancy

초록

We investigate isoscalar axial-vector mesons using a coupled-channel formalism. The kernel amplitudes are constructed from meson-exchange diagrams in the t and u channels, which are derived from effective Lagrangians based on hidden local symmetry. We incorporate six channels: pi rho, eta omega, K (K) over bar*, eta phi, eta'omega, and eta'phi, and solve the off-shell coupled integral equations. We first discuss the dynamical generation of the h(1)(1170). The pole diagram for h(1)(1170). We observe two poles at (1387 - i6) MeV and (1452 - i51) MeV, which exhibit a two-pole structure of the h(1)(1415) meson. This two-pole structure may resolve the discrepancy in the experimental data on the mass of h(1)(1415). The results show that the lower pole couples strongly to the K (K) over bar* channel, while the higher pole couples predominantly to the eta phi channel. This provides insights into the nature of h(1) mesons and explains possible discrepancies in the mass of h(1)(1415).

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