Independence of current components, polarization vectors, and reference frames in the light-front quark model analysis of meson decay constants

The issue of resulting in the same physical observables with different current components, particular from minus current, has been challenging light-front quark model (LFQM) even for computation two-point functions such as meson decay constants. At level one-body matrix element computation, we show uniqueness pseudoscalar and vector constants using all available components including component LFQM consistent Bakamjian-Thomas construction. Regardless polarization vectors, reference frames, are uniquely determined noninteracting constituent antiquark basis while interactions constituents added to mass operator LFQM.