Meson

Level

Structure Equation

Theory

Mass (MeV)

Exper.

Mass (MeV)

π⁰

1

$\left[{\pi }^{+}\otimes {\pi }^{-}\right]\oplus \left[\left(u\oplus \underset{\_}{u}\right)\otimes \left(d\oplus \underset{\_}{d}\right)\right]$

(134.97)

(134.97)

η⁰

2

${\left({\pi }^0\right)}_r\otimes {\left({\pi }^0\right)}_r=\left({\pi }^{+}\oplus {\pi }^{-}\right)\otimes \left({\pi }^{+}\oplus {\pi }^{-}\right)$

(547.95)

(547.86)

η'

3

$\left\{{\left({\pi }^0\right)}_r\otimes \left(\eta \right)\right\}={\left({\pi }^0\right)}_r\otimes {\left({\pi }^0\right)}_r\otimes {\left({\pi }^0\right)}_r$

(957.44)

(957.78)

ρ

3

$\left[{\left(d,\underset{\_}{d}\right)}_{\pi }\right]\otimes \left\{\left[\left(\text{2}{\pi }^{+}\oplus {\pi }_r^0\right)\otimes \left(\text{2}{\pi }^{-}\oplus {\pi }_r^0\right)\right]\right\}$

(775.76)

(775.26)

ρ^±

3

$\left[{\left(d,\underset{\_}{d}\right)}_{\pi }\right]\otimes \left\{\left[\left(2{\pi }^{+}\oplus {\pi }_r^0\right)\otimes \left(2{\pi }^{-}\oplus {\pi }_r^{\pm }\right)\right]\right\}$

(775.76)

(775.26)

ω

4

$\left[{\left(d,\underset{\_}{d}\right)}_{\pi }\right]\otimes \left\{\left[\left(2{\pi }^{+}\oplus 2{\pi }^0\right)\otimes \left((2{\pi }^{-}\oplus 2{\pi }^0\right)\right]\right\}$

(782.33)

(782.65)

${\varphi }^0$

4

${\varphi }^0=\left\{\left[\left(d,\underset{\_}{d}\right)\otimes \left(2{\pi }^0\oplus \eta \right)\right]\oplus \left(\eta \right)\right\}$

(1019.87)

(1019.41)