科研之友
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摘要
Light scalar hadrons can be understood as dynamically generated resonances. These arise as "companion poles" in the propagators of quark-antiquark seed states when accounting for meson-loop contributions to the self-energies of the latter. Along this line, we extend previous calculations of Tornqvist and Roos and of Boglione and Pennington, where the resonance a(0)(980) appears as a companion pole in the propagator of a(0)(1450) which is predominantly a quark-antiquark state. We also construct an effective Lagrangian where a(0)(1450) couples to pseudoscalar mesons with both nonderivative and derivative interactions. Computing the one-loop self-energy, we demonstrate that the propagator has two poles: a companion pole corresponding to a(0)(980) and a pole of the seed state a(0)(1450). The positions of these poles are in quantitative agreement with experimental data.
- 出版日期2016-1-7
