The center-of-gravity rule is tested for heavy and light-quark mesons. In the heavy-meson sector, the rule is excellently satisfied. In the light-quark sector, the rule suggests that the $a_0(980)$ could be the spin-partner of $a_2(1320)$, $a_1(1260)$, and $b_1(1235)$; $f_0(500)$ the spin-partner of $f_2(1270)$, $f_1(1285)$, and $h_1(1170)$; and $f_0(980)$ the spin-partner of $f_2^{\prime }(1525)$, $f_1(1420)$, and $h_1(1415)$. From the decay and the production of light scalar mesons we find a consistent mixing angle ${\theta }^{\mathrm{s}}={(14\pm 4)}^{\circ }$. We conclude that $f_0(980)$ is likely “octet-like” in SU(3) with a slightly larger $s\overline{s}$ content and $f_0(500)$ is SU(3) “singlet-like” with a larger $n\overline{n}$ component. The $a_0(1450)$, $K_0^{⁎}(1430)$, $f_0(1500)$ and $f_0(1370)$ are suggested as nonet of radial excitations. The scalar glueball is discussed as part of the wave function of scalar isoscalar mesons and not as additional “intruder”. It seems not to cause supernumerosity.

重心法则针对重夸克和轻夸克介子进行测试。在重介子领域，该规则得到了很好的满足。在轻夸克领域，该规则表明${\mathrm{一种}}_0(980)$ 可能是 ${\mathrm{一种}}_2(1320)$, ${\mathrm{一种}}_1(1260)$， 和 ${乙}_1(1235)$; $F_0(500)$ 的旋转伙伴 $F_2(1270)$, $F_1(1285)$， 和 $H_1(1170)$; 和$F_0(980)$ 的旋转伙伴 $F_2^{\prime }(1525)$, $F_1(1420)$， 和 $H_1(1415)$. 从光标量介子的衰变和产生中，我们找到了一致的混合角${\theta }^{\mathrm{秒}}={(14\pm 4)}^{\circ }$. 我们得出的结论是$F_0(980)$ 在 SU(3) 中可能是“类似八位字节”的 $秒\overline{秒}$ 内容和 $F_0(500)$ 是 SU(3) “singlet-like”，具有更大的 $n\overline{n}$成分。这${\mathrm{一种}}_0(1450)$, ${钾}_0^{⁎}(1430)$, $F_0(1500)$ 和 $F_0(1370)$建议作为非径向激发。标量胶球被讨论为标量等标介子波函数的一部分，而不是作为额外的“入侵者”。似乎不会造成多余。