The nature of σ, κ, a0(980) and f0(980)
- 作者：E. van Beveren ; D.V. Bugg ; F. Kleefeld and G. Rupp
- 刊名：Physics Letters B
- 出版年：2006
- 期刊代码：58_03702693
- 类别：ph
- 出版时间：12 October 2006
- 卷：641
- 期：3-4
- 页码：265-271
- 文件大小：254 K
摘要
Masses and widths of the four light scalar mesons σ, κ, a0(980) and f0(980) may be reproduced in a model where mesons scatter via a loop. A transition potential is used to couple mesons to at a radius of 0.57 fm. Inside this radius, there is an infinite bare spectrum of confined states, for which a harmonic oscillator is chosen here. The coupled-channel system approximately reproduces the features of both light and heavy meson spectroscopy. The generation of σ, κ, a0(980) and f0(980) is a balance between attraction due to the loop and suppression of the amplitudes at the Adler zeros. Phase shifts increase more rapidly as the coupling constant to the mesons increases. This leads to resonant widths which decrease with increasing coupling constant—a characteristically non-perturbative effect.