Why is the chiral symmetry breakdown determined for the vector/axial current as:(adsbygoogle = window.adsbygoogle || []).push({});

[itex] V = \frac{m_{π^{+}}-m_{π^{0}}}{m_{π^{0}}+m_{π^{+}}}\approx 0.01 [/itex]

[itex] A= \frac{m_{π^{+}}-m_{f^{0}}}{m_{f^{0}}+m_{π^{+}}}\approx 1[/itex]

?

why do we choose the difference between the pion+ (~140MeV) and pion0 (~135MeV) for the vector current or the difference between the pion(~140MeV) and the f0 meson (~900MeV) for the axial? Also why take that formulas for those asymmetries?

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# Strong chiral symmetry (SSB?)

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