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arXiv 2012.04994hep-phhep-ex
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了解$f_0(980)$和$a_0(980)$质量及其宽度

Understanding the $f_0(980)$ and $a_0(980)$ masses as well as their widths

Eef van Beveren, George Rupp

摘要:

标量介子$f_0(980)$和$a_0(980)$的低质量和近似相等的质量,以及它们相对较小的衰变宽度,是不可能用标准的$P$波夸克-反夸克态来理解的。在这里,这些介子与其他轻等标标量$f_0(500)$一起,作为低于约1 GeV的完整标量九元的成员,在单位夸克-介子模型中进行了研究。它们被证明是由夸克禁闭和强衰变相互作用的组合产生的动力学状态,导致$SU(3)_{\rm flavour}$对称性的大破缺。这是说明与几个极点轨迹在复杂的能量平面作为模型的衰减耦合常数的函数。此外,还提出了一种更轻的标量玻色子$E(38)$的实验证据,它可能对应于V.N. Gribov,作为一个可观察到的光夸克凝聚体的表现。

英文摘要:

The low and approximately equal masses of the scalar mesons $f_0(980)$ and $a_0(980)$, as well as their relatively small decay widths, are impossible to understand in terms of standard $P$-wave quark-antiquark states. Here, these mesons are studied in a unitarised quark-meson model, together with the other light isoscalar scalar $f_0(500)$, as members of a complete scalar nonet below about 1 GeV. They are shown to be dynamical states generated by a combination of quark-confinement and strong-decay interactions, resulting in a large breaking of $SU(3)_{\rm flavour}$ symmetry. This is illustrated with several pole trajectories in the complex-energy plane as a function of the model's decay coupling constant. Also, experimental evidence is presented of a still much lighter scalar boson called $E(38)$, which may correspond to a novel kind of mesons predicted by V. N. Gribov, as an observable manifestation of a condensate of light quarks.

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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