# Meson's content

1. Oct 14, 2015

### tzimie

Why mesons mixed states are defined as SOMETHING +/- SOMETHING [+/- SOMETHING] normalized by 1/sqrt(2) or 1/sqrt(3), So the sum uses quotient +1 or -1.

But in electroweak symmetry breaking charged W boson is defined as W1 (+/-) i*W2, so the quotient is +i or -i. So why mesons never use imaginary phase?

2. Oct 19, 2015

### Greg Bernhardt

mesons mix due to direct product of two $SU(2)_f$ or $SU(3)_f$ representation, while W boson mix is due to the sum of two pauli matrices $\sigma_1$ and $\sigma_2$(which is Imaginary).