Thread: CKM matrix parameters View Single Post

## CKM matrix parameters

Hi,

I understand that a 3x3 unitary matrix needs 9 real parameters to be specified (18 real parameters to start with then 9 equations of constraint arising from unitarity), but what I'm struggling to understand is how we can make phase changes of the form:

$$\mathrm{e}^{-i\beta_I} V_{IJ} \mathrm{e}^{\alpha_J}$$

to make the first row and column of $V_{IJ}$ real leaving us with only 9-5=4 independent parameters $\theta_1,\theta_2,\theta_3, \delta$, is there an easy way to see this can be done?

thanks
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