In the context of Lagrangian of Standard Model of particle physics, is the usage of the notation with $B_{\mu}$ and $W_{\mu}$ before electroweak symmetry breaking (EWSB), and the notation with $\gamma$, $Z$, $W^{\pm}$ after electroweak symmetry breaking?
Or is the notation independent to that?
You can use whatever notation / representation for the fields you want to; physics can't depend on your choice of variables. But yes $B_\mu$ and $W_\mu$ are more useful variables for describing the Standard Model when the Higgs vev is zero, and $\gamma, Z, W^{\pm}$ are more useful when the Higgs vev takes its present-day value.
