THE CONNECTION BETWEEN PHOTON MASS AND B-(3) - THE POINCARE GROUP

The)le longitudinal vacuum field B-(3) is an experimental observable w hich produces by magnetization a well-defined square-root beam power d ensity dependence. Its longitudinal polarization implies that the heli cities of the photon are +1, 0, and -1, and that the little group of t he Poincare group is the rotation group 0(3) of a massive boson. The m ass of the photon (m) is therefore related directly to B-(3) through t he Proca equation, and it is concluded that experimental evidence for B-(3) is also evidence for finite m.