Thread: CKM matrix parameters View Single Post
 P: 411 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