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arXiv 1107.3247hep-phnucl-th
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从酉共振手征动力学研究ρ和f0(600)介子的大Nc性质

Large-Nc Properties of the rho and f0(600) Mesons from Unitary Resonance Chiral Dynamics

J. Nieves, A. Pich, E. Ruiz Arriola

摘要:

我们构造的π-π振幅满足精确的弹性么正性,占一个循环手征微扰理论的贡献,包括所有1/Nc主导条款,唯一的限制是只考虑最低的交换共振九重态。在这样的计划,Nc的依赖性的西格玛和ρ的质量和宽度进行了讨论。鲁棒性的结论得出的情况下的ρ共振,确认它是一个稳定的介子的限制大量的QCD颜色,Nc。在标量-等压线部分得出了不太确定的结论。以目前的数据质量,我们不能确定Nc=3 f0(600)共振是否在大Nc时完全消失,或者它在结构中有一个次主导分量,这将在足够大的夸克颜色数量下成为主导。

英文摘要:

We construct pi-pi amplitudes that fulfill exact elastic unitarity, account for one loop Chiral Perturbation Theory contributions and include all 1/Nc leading terms, with the only limitation of considering just the lowest-lying nonet of exchanged resonances. Within such scheme, the Nc dependence of sigma and rho masses and widths is discussed. Robust conclusions are drawn in the case of the rho resonance, confirming that it is a stable meson in the limit of a large number of QCD colors, Nc. Less definitive conclusions are reached in the scalar-isoscalar sector. With the present quality of data, we cannot firmly conclude whether or not the Nc=3 f0(600) resonance completely disappears at large Nc or it has a sub-dominant component in its structure, which would become dominant for a number of quark colors sufficiently large.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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