Advanced Analysis: Deriving the formula for g
|So . . . the constant in the hyperbola is the same as the time measured by an observer who sees the creation and decay events occur at the same location. There is only one observer for whom this can happen--the observer would have to be traveling with the meson in order to see the events in the same spot. Anybody not traveling with the meson will see the creation and decay at different locations; to these folks the meson seems to move.|
This is the heart of relativity. Observers moving differently "see" the same events differently.
Now, about g . . . .